The Comms Room

Joel E Salas

00:01

@ewwhite I feel like you'd be a Ktown kind of guy

do you like walking?

ewwhite

@JoelESalas Well, my clients are just south of Little Tokyo...

Joel E Salas

@ewwhite Arts district is always an option, though it's unnecessarily expensive

btw we're going to your favorite sausage fest

ewwhite

and I'm trying to decide between just doing my JW/Ritz thing each month or getting a place of my own.

@JoelESalas Love that shit...

I tried to take my wife a week or two ago...

line was out the door

Joel E Salas

@ewwhite Did you end up somewhere else? Possibly at a pie hole?

ewwhite

@JoelESalas Room service at the Ritz Carlton.

she said, "eff this Hipster shit!"

I'd like to try the Pie Hole.

So I like downtown LA, mainly because it's changing...

but really, walkability

I s'pose Santa Monica has that, too

Michael Hampton

00:41

Don't we have a canonical "Use puppet, dumbass" answer somewhere?

Shane Madden

@MichaelHampton If we don't, we should.

ewwhite

01:03

@MichaelHampton why, where?

Michael Hampton

0

Q: Sync multiple server configs

I have a pool of servers and keeping them the same has been a challenge. I'm running the latest CentOS 6 and I'd like them to all have the same server configurations (updates and installed modules). I don't need my files sync as I use rsync for that. Currently I have to log into each of them and...

Yeah, so... I wasn't getting SNMP data for two months and Zabbix didn't warn me. Oops! And the reason why I wasn't getting SNMP data? snmpd is stopped

Shane Madden

@MichaelHampton Hah. You didn't want that data, did you?

Michael Hampton

@ShaneMadden Well, I would have liked it before tonight when the disk filled up and I actually did get an alert... "MySQL is down"

Shane Madden

Heh. I just got a "uh, disk is full" call a few minutes ago. Non-production server, so I'll figure out how badly the crappy monitoring failed on tuesday.

Michael Hampton

01:19

I read the bloody Zabbix manual cover to cover... it's time to ask Server Fault!

ewwhite

01:42

@MichaelHampton I'm actually working on my puppet configs to make sure my data collectors are always running

Notice: /Stage[main]/Ewwhite/Service[procallator]/enable: enable changed 'false' to 'true'

Michael Hampton

@ewwhite It's a client system and not (yet) puppetized. Won't happen until I convince him it's worth spending the money on.

ewwhite

Do you charge a lot for it?

Michael Hampton

It's not that, he's just a real penny pincher

ewwhite

but what's your charge for stuff like that?

Michael Hampton

Though if he agrees t the work he always pays on time and in full.

ewwhite

01:44

I don't charge specifically for puppet... it's more of a justification of my prices

Michael Hampton

Hell, I may end up doing it for him for free. He's been with me for almost ever. 2006 or so?

Just so I don't have to get interrupted in the middle of dinner anymore.

mossy

'ello

ewwhite

yep

Michael Hampton

The Zabbix SNMP thing is really pissing me off though.

Michael Hampton

02:10

Oh, this is new...

Andrew

@MichaelHampton so long story short, #monitoringsucks

Michael Hampton

@Andrew Everything in IT sucks. If it didn't, there would be far less need for system administrators to manage the suckage.

HopelessN00b

@MichaelHampton Only because developers make all IT software.

ewwhite

02:40

@MichaelHampton Wanna help me with a puppet decision?

ewwhite

03:14

damn puppet.

Ryan Ries

03:25

@ewwhite What's wrong with Puppet? My Linux guys drool over Puppet like the best thing since sliced bread.

ewwhite

@RyanRies I need to do a few things... having a hard time deciding how to implement

it's very powerful

Michael Hampton

@ewwhite What sort of suckage are you looking at?

ewwhite

@MichaelHampton All HP servers with management agents have a file at: /opt/hp/hp-snmp-agents/cma.conf

it governs the agents and email notification settings.

I'd like to ensure a specific email address across all systems with that file

struggling on where to define this and whether to just push a file or try string manipulation

I was about to try augeas, but there's no lens... and it seems more complex than necessary

I could also do this with templates

Config file content is here: pastebin.com/uuuvL5JN

template makes most sense, right?

Michael Hampton

03:49

@ewwhite I see exactly two uncommented directives and four other directives. It shouldn't take more than an hour to write a whole puppet module to control all of them and generate the file from an appropriate template.

ewwhite

I already wrote the template.

Michael Hampton

And if you don't care about them, and just want trapemail, you could do it in about five minutes.

ewwhite

I'm checking EL4,5 and 6 servers just to see if the file's format changed

in the early EL5 days, I had to exclude certain daemons

Michael Hampton

But yeah, it should be easy, you might even put it on the puppet forge.

ewwhite

and now, HP has a stupid bug that requires me to zero the contents of one of the config files.

Remove current contents of usb-device.sh by performing the following:
Note: The USB data from the hp-snmp-agents (cmastdeqd) will no longer be available until package is reinstalled or updated.

Open the /opt/hp/hp-snmp-agents/utils/usb-device.sh file in any Linux editor.
Delete current contents of the file.
Save and exit.
Restart the cmastdeqd by typing the following command:
/opt/hp/hp-snmp-agents/server/storage/etc/ cmastdeqd restart

There are a couple hp agent modules on Puppet forge

I still wrote my own

Michael Hampton

03:53

Text editor my ass. > /opt/hp/hp-snmp-agents/utils/usb-device.sh

ewwhite

Then it gets a file resource... needs to notify the agent to restart

Michael Hampton

That's all boilerplate code though

ewwhite

hmmm, to break this out into params.pp or not...

Michael Hampton

If you don't, six months from now you're going to look at it and wonder what you were smoking when you wrote it.

ewwhite

I end up looking at puppet modules once every month or two

because once it's in, it really does work well

I do have about 20 more modules to make on my to-do list, though

K. Module is live.

I'd like to add a variable in my ENC for additional alert destinations... hmm

Iain

06:32

G'day

Portia

this is a love hotline?

2

how?

we ask love questions here?

AJ Henderson

@Portia I think they were just being fasitious (sp) it's a general chat room that tends to be off topic a lot

Portia

okay

Journeyman Geek

lol

@AJHenderson: The comms room has a unique culture...

;p

Iain

It's topical at all ?

Journeyman Geek

06:46

Well, its topical in never being about live support?

2

;p

Falcon Momot

09:17

ugh, claiming credit card insurance is hard

like finding something worth answering on this site

you have to do it at specific times of the day and week, and as often as not it just doesn't happen

Journeyman Geek

;p

Falcon Momot

they owe me $305.00

so I will fight them on the phones, and I will fight them in the branches, and I will never surrender...

2

Dennis Kaarsemaker

10:51

@Iain it's topical as in topical cream

Michael Hampton

13:25

Why don't you ask Google? — Michael Hampton 8 secs ago

Michael Hampton

14:07

0

Q: Windows: View network shares without sharing anything

Using windows, I would like to be able to browse computers and their shares on the network, without publishing any shares, administrative shares, and not even having my computer listed in the "Network" folder on other computers. When using windows, if I go to the "Network" folder, I get this yel...

windows security network-share

Iain

14:25

@DennisKaarsemaker and don't mention the lube ...

Matthew Ife

14:36

@MichaelHampton is too quick on these questions. Not getting a look in!

Michael Hampton

It's Sunday morning and I'm bored watching a bunch of servers install updates. What else am I supposed to do?

Matthew Ife

Theres always porn.

2

Iain

strava.com/activities/113698521 that was not fun to go down on my bike - 33% is a bit steep

Matthew Ife

14:57

@Iain I'd get to 20 miles, look up, then get a bus home and a bag of chips.

Iain

@MatthewIfe beautiful weather today here - way too good to miss

Matthew Ife

You know it is still really nice outside here too. Might be worth going out

Iain

I may go and potter in the garden - there's a bit of tidying up to do after the recent storms

Michael Hampton

It's -5 and WINDY. I'm not going outside!

Dennis Kaarsemaker

@Iain shouldn't you be riding a waterbike these days? :)

Iain

15:11

@DennisKaarsemaker I'm generally ok if I need a water bike there will be arks afloat. At times going up Gadlys lane strava.com/activities/113698521/segments/2502083374 there was water running in streams down both sides of the lane though.

Matthew Ife

Further south its worse.

I'm currently surrounded by lakes that were not previously there in December.

Iain

15:29

@MatthewIfe where are you ?

ewwhite

@Iain I'm still riding indoors here

Iain

@ewwhite strava.com/activities/113698521/segments/2502083374 convert that segment for your trainer - you'll love it 800ft in 2.9 miles

Matthew Ife

@Iain Oxford.

Dennis Kaarsemaker

yeah, lake Oxford is pretty damp now

Iain

@MatthewIfe ah the Thames floods - could be worse, could be in Somerset

Matthew Ife

15:40

@Iain yea, I have been pretty lucky in all honestly. Lots of areas in oxford were flooded, I'm just surrounded by water but not submerged in it.

tombull89

16:07

What. I just got an answer to a question accepeted. I posted the answer over two years ago.

Iain

16:23

@tombull89 the OP just came back

Matthew Ife

@tombull89 must be lag.

Michael Hampton

Fucking people. The questions are bad, and so are the answers.

Iain

@MichaelHampton examples ?

Michael Hampton

0

A: Can Zabbix alert me when an SNMP device does not respond?

You could create a trigger to fire when the device does not respond, with the action being send an email to the administrator.

Iain

ah, but not bad enough to downvote

Matthew Ife

16:39

@MichaelHampton According to the answer its "when the device does not respond"

I have no idea how much of that answer is an answer :)

Michael Hampton

@MatthewIfe There's no known item name corresponding to this condition, even though it's obvious from the GUI that Zabbix tracks it. It's impossible to write a trigger without the item name!

Strangely, there IS one corresponding to use of the Zabbix agent, and that trigger already exists and is preconfigured by that template.

But none of the SNMP templates do this.

Matthew Ife

Is zabbix receiving traps or sending requests?

Michael Hampton

It's sending requests.

Matthew Ife

Can you set thresholds that are dynamic?

I mean, can you ask for sys.uptime and expect it ot fall within a given range/

or, does the event not even process in that case

ewwhite

16:57

RPM dependency hell!

WARNING: Can't read module /lib/modules/2.6.9-78.0.1.plus.c4smp/weak-updates/xfs/xfs.ko: No such file or directory
WARNING: Can't read module /lib/modules/2.6.9-78.EL/weak-updates/xfs/xfs_quota.ko: No such file or directory
WARNING: Can't read module /lib/modules/2.6.9-78.EL/weak-updates/xfs/xfs.ko: No such file or directory
WARNING: Can't read module /lib/modules/2.6.9-78.ELsmp/weak-updates/xfs/xfs_quota.ko: No such file or directory
WARNING: Can't read module /lib/modules/2.6.9-78.ELsmp/weak-updates/xfs/xfs.ko: No such file or directory

I'm dirty for even dealing with this

Michael Hampton

RHEL 4? Take it out back and shoot it.

ewwhite

Just upgraded from 4.7 to 4.9 :)

Selling client a new server...

been awhile since I've had to deal with weak-updates

I have three EL4 systems left.

I mean, getting to EL6 was a goal... but now @MichaelHampton says I need RHEL 7!

Michael Hampton

Yeah, but RHEL 7 isn't ready yet. You'll just have to limp along for a while longer :)

I think my affair with ZFS on the desktop is about to end.

Dennis Kaarsemaker

17:13

tsk tsk, RHEL 4

I'm kicking 5 out the door as we speak

Michael Hampton

I kicked 5 out the door a year ago!

Dennis Kaarsemaker

6 was giving us humongous performance problems a year ago

only after those were solved, we started killing off 5

Michael Hampton

Yeah, certain hardware had issues, as I recall. But I think @ewwhite knows more about that.

pauska

@ewwhite I forgot to ask.. are all the drive slots on a 380 connected to the same internal sas port, or are they split?

I see two sas ports going from the raid controller, but couldn't be bothered to dismantle the server to see where they went :)

ewwhite

@pauska Sure...

so, a DL380 G6/G7 has one or two 8-port drive bays.

these are direct ports... 1:1 to the controller, so no expander or oversubscription

the two SAS SFF-8087 ports you see coming from the backplane are 4-lane 6Gbps SAS connectors.

pauska

17:26

yea the ones I bought have one 8-bay

ewwhite

so the P410i controller onboard can handle 2 x 4 == 8 SAS drives.

pauska

ok

but how is the mapping done? each disk has one lane to each controller port?

ewwhite

1-4 go to one connector, 5-8 go to the other.

pauska

ah

so two ssds in 1+2, and two in 5+6 then

ewwhite

I actually split it the other way...

1 and 5...

pauska

17:29

I need more than 1 and 5.. four ssds

ewwhite

Smart Array P410i in Slot 0 (Embedded)    (sn: 500143802335E8F0)

   array A (SAS, Unused Space: 15085  MB)


      logicaldrive 1 (72.0 GB, RAID 1, OK)
      logicaldrive 2 (200.0 GB, RAID 1, OK)

      physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 300 GB, OK)
      physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SAS, 300 GB, OK)

   array B (Solid State SATA, Unused Space: 1012121  MB)


      logicaldrive 3 (400.0 GB, RAID 1+0, OK)

      physicaldrive 1I:1:3 (port 1I:box 1:bay 3, Solid State SATA, 480.1 GB, OK)

pauska

yeah well thats the same I was going for

you use 3+4 and 7+8, and I'll use 1+2 and 5+6..

ewwhite

so that's a PAIR of OS drives... 300GB SAS. In ports 1 and 5. Split across SAS cables.

pauska

Yeah not going to be using OS drives this time

ewwhite

Oh, yes...

I'd also create a logical drive smaller than the capacity of the SSDs.

unless you need all of the space

@DennisKaarsemaker I'm trying to get rid of EL5, too.

@MichaelHampton Y u want to get rid of ZFS?

Michael Hampton

17:33

@ewwhite It seems to be leaking memory like a sieve. Maybe I'll do a NAS with FreeBSD or something. But it's not working out for me on the Linux desktop

ewwhite

@MichaelHampton Hmm, I'd urge you to try it the Red Hat/CentOS way.

no memory leaks

Michael Hampton

@ewwhite I used the yum repo from zfsonlinux.org. Is there some other way?

ewwhite

@MichaelHampton Oh, no... I thought you were using another distro

Michael Hampton

I may give btrfs another look

ewwhite

@MichaelHampton DOn't say that.

terrible!

Michael Hampton

17:38

@ewwhite What's wrong with btrfs?

ewwhite

I don't see what's wrong with ZFS..

@MichaelHampton unstable.

no momentum.

no mindshare

ZFS is pretty portable and can perform quite well.

I like the flexibility... I use ZFS for NAS/SAN... ZFS to host my Apple Time Machine backups (with HFS+ on top), XFS on top of ZFS for my produce clients, ZFS to back VMware, ZFS for large image stores (4 million+ files).

It only let me down once... and that was a Nexenta bug

Matthew Ife

Last time I tried btrfs was a year ago. Was unstable over LVM, returned a couple of oops's on my ssds without using lvm too.

Might be different now, but wasn't hugely impressed back then.

WRT storage, I have a very low tolerance for filesystem issues.

ewwhite

It doesn't offer anything that ZFS doesn't have.

Michael Hampton

It worked quite well for me on FreeBSD

@ewwhite My most serious issue right now is it seems to be eating all my RAM and not giving it back up. Despite I limited the ARC to 2GB.

ewwhite

did you reboot?

seriously, cut ARC down to something like 1GB

but make the change persistent in /etc/modprobe.d/zfs.conf

Michael Hampton

17:54

I even put it on the kernel command line. zfs.zfs_arc_max=2147483648 No obvious effect.

pauska

@ewwhite Why? Speed?

ewwhite

@pauska overprovisioning of the SSDs

because they're consumer disks... better for their health

pauska

I don't think this is a problem with the ones I ordered

ewwhite

@pauska always over provision if you can on a controller/combination like this.

unless you need ALL of the space

Iain

19:30

StackExchange Status

@StackStatus

Status updates for the Stack Exchange network, including http://t.co/VY1vdMiR. You can also find more detailed updates on http://t.co/uCcZjNx5.

94 tweets, 513 followers, following 1 users

Michael Hampton

Chat kind of barely works...the main site is unusable

That's not "a bit" of increased traffic, it's probably some kind of DDoS attempt

Iain

I'm getting lots of loss from internap-gw.ip4.tinet.net onwards

Stack Exchange

myotherpcisacloud.com: Verifying RPC Network Connectivity Like A Boss

posted on February 16, 2014 by ryan

Aloha. I did some fun Powershelling yesterday and now it's time to share. If you work in an IT environment that's of any significant size, chances are you have firewalls. Maybe lots and lots of firewalls. RPC can be a particularly difficult network protocol to work with when it comes to making sure all the ports necessary for its operation are open on your firewalls.&…

Joel E Salas

20:14

@ewwhite What's the mechanism behind that?

pauska

20:39

@ewwhite you're spot on

they tripled the IOPS output on these ssds at 80% provision

tweaktown.com/reviews/5822/…

well, on random stuff.. on pure sequential stuff it didn't matter at all

Mark Henderson

We have partially mitigated a DDoS attack against our network. We are continuing to watch traffic.

Tweeted by StackStatus on February 16, 2014 at 8:05 PM

ewwhite

@JoelESalas It's just hardware voodoo

@pauska The cheaper SSDs don't guarantee performance as capacities fill. The expensive SSDs are more deterministic, but cost too much...

That's why I'm still doing more with PCIe SSDs

pauska

Well, we'll either go raid5 with 1.5TB of raw or RAID10 with 1TB

cutting 20% of either of those will be just fine

thanks for the tip

ewwhite

welcome

Michael Hampton

21:21

@Iain I ain't got time for that shit!

Iain

@MichaelHampton I was aiming to educate them

Michael Hampton

I guess I could see if unix.se wants it, but unix.se is still down...

Iain

@MichaelHampton oh no, don't migrate shit

Michael Hampton

@Iain No, I was going to see if they had a canonical

Iain

I didn't realise I hadn't chucked a close vote on it tbh

Michael Hampton

21:27

I decided to spend the "outage" time picking up some groceries, and I come back to THIS!

Iain

@MichaelHampton what makes the outage time special, just spin on your chair and you'll get that !

Michael Hampton

@Iain It was supposed to make those people go away, at least for a while!

Jeezus, there are a shitload of bad tutorials out there.

Iain

@MichaelHampton we see evidence of that here every day

Michael Hampton

@Iain I know, I just saw another one. I'm actually seriously considering starting a web site and writing good tutorials. Maybe it'll actually generate some ad revenue too.

Iain

@MichaelHampton it probably would

Michael Hampton

21:41

And then I just found nearly identical directions to the bad tutorial in an accepted SF answer.

Iain

do they/would they work ?

Michael Hampton

@Iain Yes, but it's difficult to maintain, and gives you spurious warnings.

Iain

@MichaelHampton you beat me to that one too

Michael Hampton

I happen to be reading the front page right now.

-3

Q: Router Switch hanged down

I have a switch placed in department and connected through Media Convertor which is directly connected through optical fiber cable from #com Switch. Now the issue is Some times suddenly Endpoint Switch hanged down and led become slowly slowly blinking,and 5 desktop systems there, loss their conne...

networking switch hub

What's wrong with this question (aside from the bad English)?

Iain

@MichaelHampton dunno

Michael Hampton

21:53

Oh, it was a fucking review audit

Iain

@MichaelHampton I quit reviewing because of the audits

Michael Hampton

@Iain Well, at least I passed it.

Michael Hampton

22:12

@JoelESalas All the btrfs oopses I could find were in reference to years-old kernels. Apparently you'd have to work a lot harder to crash it on a mainline kernel. (And I run mainline on my desktop.)

@ewwhite The only really missing feature from btrfs is it has no equivalent to a ZFS zvol, which I can live without.

Matthew Ife

@MichaelHampton just converted my filesystems to btrfs (since we talked about it and it was a year ago)

if things go horribly wrong i'll be sure to let you know ;)

Michael Hampton

@MatthewIfe And i went to ZFS... it isn't quite ready for the desktop I think.

Matthew Ife

I wanted something that does intelligent backups (my backup directory was consistently full) without going out of mainline.

Michael Hampton

@MatthewIfe Well, I have to sort out encrypted offsite backups... Easy enough with Bareos but I wonder if I can take advantage of these shiny new btrfs features somehow.

pauska

@ewwhite how do I control the over provision space? Is it enough to just leave 20% free on the array?

Mark Henderson

22:24

@MichaelHampton friend of mine thought it would be clever to use ZFS on his netbook (yeah, apparently they still make those things) - single-core Atom 1.6, 1GB RAM.

I think we can guess how well that ended

Michael Hampton

@MarkHenderson I've heard of people doing it. Never actually spoke to one, though.

Mark Henderson

@MichaelHampton This was his facebook quote

> Probably should have done a bit more research into ZFS before attempting to implement it on a Single Core Atom 1.6 ghz with only 1gb RAM...

pauska

I tried booting FreeBSD with 512MB of RAM and ZFS at the root system

It did not end well

Mark Henderson

> Dedupe was off, but compression was on...
Needless to say it's running *a lot* better with UFS

Michael Hampton

@pauska I had no issues with a 4GB FreeBSD VM and ZFS root. Runs like a dream. Even made me like ZFS.

Oh wait, strike that. It wasn't a ZFS root, the data was on ZFS.

Mark Henderson

22:29

I have a ZFS-On-Linux that I'm testing at the moment for our subversion repositories

pauska

@MichaelHampton I don't have 4GB of extra ram on my home desktop

Mark Henderson

But not as root

Michael Hampton

When I tried to install 10.0-RELEASE with a ZFS root, the result was unbootable.

pauska

getting two new lab servers with 96GB ram this week, so I'll do another test

Mark Henderson

@pauska Sigh, lab servers with 96GB... I wish :P

Our lab server has 24GB :P

(singular)

Michael Hampton

22:30

My desktop, with 16GB of RAM, is my lab server...

Mark Henderson

@MichaelHampton I have one of them at home too. You can run a lot of Linux VM's in there

Core 2 Quad with 16GB. Old and getting slow, but suffices

pauska

Yeah our CTO has new tech as a high priority

he wants all of us to be able to lab and test new products and then deploy them if it makes sense for us

Mark Henderson

@pauska Wow

Lucky you

pauska

and we don't want those tests to affect the production servers/san

Michael Hampton

Wow, that's like... a blank check!

Mark Henderson

22:33

The only CTOs I have the misfortune of dealing with are all stingy bastards whose primary goal is to save money and implement as many firewalls as they can

pauska

MSDN licenses, TechEd, lab environment etc

Michael Hampton

@MarkHenderson You might have me beat there... AMD Phenom(tm) II X6 1075T Processor

pauska

the only "bad" part is that these servers are going to make our SAN look like it's pre-ww2 tech

4x512GB SSD's in each

and it's going to be hard to actually test how it will perform in production

Mark Henderson

@pauska One of our clients went and bought a brand new, top-spec Dell R720 with 8x SSD's in RAID10, and then wondered why their software wasn't any faster. They never checked to see if they were disk limited or not - they had just read about how fast SSDs were and went with it

@MichaelHampton cpu-world.com/Compare/835/…

They're mostly on par with your AMD having more cores

Michael Hampton

@MarkHenderson Aaaugh, I had a Q6600 .... five years ago!

Mark Henderson

22:40

@MichaelHampton Yes well, the barber is always the last one to get a haircut

And that was the wrong processor, I think yours is actually this:

cpu-world.com/Compare/211/…

Which is substantially better

And any upgrades have a WAF of 0.0 which makes them unlikely :p

Michael Hampton

Yeah, I think it's time to upgrade my box. Or build a new one.

ewwhite

@MichaelHampton zvols are magic

@pauska For you, just create a logical volume smaller than the array's capacity.

Download the HPSSA Offline CD to configure your RAID volumes

Mark Henderson

@MichaelHampton I mostly only do minor lab stuff on there and play the occasional game, and I only buy games that are on sale on Steam which means that most of them are 3-5 year old anyway

ewwhite

I'll convert all of YOU to ZFS!!!

Mark Henderson

@ewwhite Then get better support for it in Linux

ewwhite

22:48

It works great

on Linux

Mark Henderson

Then why do I have to jump through hoops to get it installed?

ewwhite

that's my main platform for ZFS nowadays, since I left Solaris/Nexenta

two commands to install it

(on CentOS/rhel)

Mark Henderson

Hrm

Mine was substantially more than 2 commands

ewwhite

@MarkHenderson rhel?

Mark Henderson

@ewwhite CentOS

ewwhite

22:49

Michael Hampton

@ewwhite Tell me more about this magic.

Mark Henderson

OK, I lie - it was two commands to get it installed

But then it was a hassle to get a usable volume out of it

Or, maybe I'm just dumb

My Linux skills are more akin to a monkey bashing the keyboard

ewwhite

here's ZFS on a new server...

yum localinstall --nogpgcheck archive.zfsonlinux.org/epel/zfs-release-1-3.el6.noarch.rpm
yum install zfs
zpool create -f vol1 mirror wwn-0x500000e014609480 wwn-0x500000e0146097d0 mirror wwn-0x500000e0146090c0 wwn-0x500000e01460fd60 mirror wwn-0x500000e01460e7f0 wwn-0x500000e0163a9990 mirror wwn-0x500000e014611300 wwn-0x500000e0152a3550 mirror wwn-0x5000c5001cdf0113 wwn-0x500000e014605e30
zpool create vol2 raidz1 wwn-0x5000c5000c245113 wwn-0x5000c5000b307057 wwn-0x5000c5001cc4b45b wwn-0x5000c5000b30d58b wwn-0x5000cca00a0ea20c wwn-0x5000cca00a1a63ec

that resulted in two pools of disks and two filesystems.

Mark Henderson

@ewwhite What the hell are all those flags in line 3 and 4?

ewwhite

@MichaelHampton zvols are very nice... I have a situation where I have heavily compressible data...

@MarkHenderson the WWNs of each disk

LSI controllers show each SAS disk's WWN

Mark Henderson

22:54

@ewwhite Ooohhh ok

ewwhite

@MichaelHampton So you can run XFS/ext4 on top of ZFS zvols...

and get compression, snapshots, clones, etc.

Mark Henderson

@ewwhite So that created Vol1 as five two-disk mirrors, and then vol2 as RAID Z1 on the remaining 6 disks

ewwhite

yep

[root@Testa_Mirror1 ~]# zpool status -v
  pool: vol1
 state: ONLINE
  scan: none requested
config:

        NAME                        STATE     READ WRITE CKSUM
        vol1                        ONLINE       0     0     0
          mirror-0                  ONLINE       0     0     0
            wwn-0x500000e014609480  ONLINE       0     0     0
            wwn-0x500000e0146097d0  ONLINE       0     0     0
          mirror-1                  ONLINE       0     0     0
            wwn-0x500000e0146090c0  ONLINE       0     0     0

Mark Henderson

So, effectively RAID10 and RAID5

ewwhite

yep

Mark Henderson

22:58

(only better)

@ewwhite That... is pretty damn nice

It's also simpler than what I did to get it working

ewwhite

so it's a volume manager + RAID + whateevr

most of my installs don't have raw disks like that... so I just use ZFS on top of hardware RAID.

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