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00:24
Gaahhh I just got another 30 rep from that stupid auditor is an idiot question
Just let it die people
@MarkHenderson you have the power to lock it.
@Zoredache Yeah but.. free rep
I'm not stupid
If you really want free rep add a 50 point bounty. I bet you would earn more then you spent.
00:30
@MarkHenderson: MOD ABUSE!
@Zoredache: does that actually work?
Graahhh would I be an BOFH if I dropped a single VM's IOPS limit to < 100?
@JourneymanGeek What? Earning rep on questions you put a bounty on? Yeah, why wouldn't it? It has to be a pretty active/good question though.
ahh, never thought of it that way
He would just need to get more then 5 upvotes in a week.
00:34
I am tempted to add a bounty, just to hand out the free rep. I am almost certain the rep gained by the top 3-4 questions would exceed the cost.
oh, I've done that once or twice
Should I be annoyed at someone who blatantly copies my answer into their own, on the same question?
Its natural
comment that he did, and it should probably screw things up for him ;p
you guys again
haha :P
@MichaelHampton Did he add lots of additional details? Did he cite your answer? I occasionally will quote/copy another persons answer and add more details, if I think I am significantly improving upon the old answer.
Give us a link and we will go down-vote the evil person... >:)
00:41
Eh, it's only a minor improvement. Though he certainly didn't acknowledge it in any way.
OHMAGAWDITSADEVELOPER
anyway
reddit.com/r/sysadmin/comments/13h85x/… -> I thought google tended not to hire people who spilt the beans on the hiring process AKA, I wonder if he shot himself in the foot
Given that he admitted he had done poorly, I think he was already under the impression that he wasn't getting the job.
ahh ;p
I guess
My question is knowing Big-O notation, sorting algorithms, and unusual tree structures something they expect a sysadmin to know?
Well, from what i've researched, they seem more interested in how you answer
00:51
@Zoredache Google, probably
Well seeing ur flare is DEVOPS. you got quizzed as a programmer it seems like. Which pretty much tells everyone that you're a sysadmin who can't code for shit and think you're somehow DEVOPS aka LOL-OPS.

TLDR: You interviewed for a position you aren't qualified for and got the result you should.
^ This guy. Give him a medal
But then again, I learnt Big-O notification in EE school. Didn't really understand it ;p
(then again, comp-sci in engineering school is painful.)
@Zoredache Yes, you should know it.
All I know is that O(1) is good, O(n) is meh, and O(n2) is REALLY BAD.
@Zoredache Because a lot of our work is in support of developers... helping understand their processes and the vocab make a difference.
00:58
lol
@MichaelHampton Maybe, but does it really matter that some function is badly written O(n2) when it only takes 1ms, and only accounts for 1% of the total run time of a task? The output of a profiler is almost always more interesting and useful.
@Zoredache Yeah, but that's what the developers should be worrying about, is it not?
yup
and theres O(log n) which is important, but I can't be arsed to remember what it is
About theoretically performance issues? No, I want them to be pragmatic. When they worry about optimization too much they make things worse by optimizing the wrong thing.
As a sysadmin, if I have to put somebody's code under a debugger or a profiler, then something has gone horribly wrong somewhere.
01:02
Ah, but if you want to wear a devop hat, you might need to do that.
I don't want to wear a DevOps hat. You can keep it.
And I still have nightmares about the day I was asked to run PHP under gdb. In production.
why gdb? and why production?
Because PHP was segfaulting randomly - but only in production. It would never crash on the staging server no matter how much load they put on it.
My love affair with PHP ended long ago. I really wish it would just go away.
01:13
@Zoredache @MichaelHampton I've done both. It's a different approach to solving the problems. I understand more about the HW side...
@Zoredache Optimising is best done on the drawing board by selecting the right algorithm. Not afterwards :)
Anyone ever converted a GPT disk to a MBR disk? (yes, I know its usually the other way around)
Nope. I should be possible, but I prefer the same way.
Copy data, test data, repartition
Ofc, that assumes you have enough space to copy the data.
01:44
@Michael Just remember that depending on the size of your dataset the difference between O(1) and O(n^n) may not matter. :)
@Journeyman Most good sorting algorithms are O(n log n)
^^
This is why I'm not a programmer ;p
No. Kidding.
Algorithmic Complexity is something I did not enjoy.
Thanks @ewwhite, but price-wise an ioDrive2 (1.2TB) is around $14k, where as 16 x 256GB Crucial m4s be around $2880. As far as realistic speeds, I'd like to be able to read data at around 300MB/s and write close to that speed as well. — heyjon 1 hour ago
Fuuuuuuck I want to be able to buy 16x SSD's for $2880
Here they would be more in the vicinity of $5k+ for that kind of gear
something tells me he's using consumer SSDs and putting them in dell drive sleds
He's using consumer SSD's
01:57
isn't that kinda pokey for 16 SSDs?
You don't need that many SSD's to do 300MB/sec
I can get 300MB/sec from an 8-drive Nearline SAS array in RAID 5
thats what i was about to say... its not like those SAS disks available for an R720 are slow
@SpacemanSpiff Exactly. We've got a bunch of R710's with the 3.5" SAS disks and although I haven't benched them I know they'd do 300MB/sec
But if he's got the budget, shit, who am I to stop him?
lol, true
I think that's bad design.
01:59
we've been playing around a lot with Nimble iSCSI arrays
very cool
dual "fusion-io"ish powered controllers, then four SSDs and 14 SATA disks
@ewwhite Which part?
20k IOPs and 36TB in 3U
so far so good
I'd get a FusionIO drive or just go with a proper SSD array... I note the differences between the SSD models because some are hug differences in their performance.
SO I use Sandforce-based SSD's for consumer applications... STEC, Toshiba and Sandisk SSD's for enterprise.
I don't know much about SSD's but there's implementation/architectural differences between enterprise and consumer as well isn't there?
Yes.. at the very least, SAS versus SATA
02:01
Something about SLC/MLC and the amount of "spare" space
but then it's latency, lifetime and other parameters.
Oh, and whether a supercapacitor is on the drive... (to protect data in the event of sudden power loss)
02:15
@MarkHenderson: SLC MLC and TLC - SLC is the 'best' stores one bit per cell, and had the longest lifetime. MLC stores 2 and is used in consumer drives. TLC is even cheaper, stores 3, and is new, so people don't trust it.
enterprise grade drives usually use SLC, or higher grade MLC
also, apparently the larger the process size used for the nand chips, the better
Devops strike again!
-1
Q: copying folder and file permissions from one user to another after switching domains

emptyspacesPlease excuse the title, this was the best way I could think to describe this scenario without an entire paragraph. I am using C#. Currently I have a file server running windows server 2003 setup on a domain, we will call this oldDomain, and I have about 500 user accounts with various permission...

@JourneymanGeek Interesting, thanks
(naturally, I'm getting a 20nm, TLC drive, and apparently the more expensive MLC version has a tendancy of dropping dead ><)
@JourneymanGeek I read that as "dropping head" and was wondering how that was a bad thing
But OK... so TLC drives aren't expected to last very long then?
;p
but its a free drive, and I will be backing up religiously so its fine
You're getting SSDs for free?
02:19
superuser contest prize
Oh nice
What contest did you win?
the windows 8 one, got a tier 3 prize - a SSD, monitor or GPU of value up to 200usd(with tier 4 being a surface tablet)
@JourneymanGeek Awesome! Good on ya
I came so close to winning an API prize
It wasn't officially mentioned byt I came 4th, with only the first three winning prizes
Picked an SSD cause I'd need to get it reshipped
ow
(as revealed by JAtwood)
02:21
Nice timing too
I'm building a computer around this period
Perfect ;)
so thats storage taken care of, already have a nice case. getting mobo, cpu and ram next month, possibly a cooler. then a power supply the month after that, then a GPU
SSDs are awesome
(stupid shared comp video card dying put me back a month ><)
02:36
So..for when I eventually go shopping, what features do enterprise-grade SSDs have that consumer ones lack; or, how can I positively identify one?
@MichaelHampton: I think @ewwhite might have a better idea here....
but I'd guess SAS would be a giveaway
though there's PCI-E ones as well
SLC would be good too
(though a lot of drives use MLC too these days)
Well, yes, the price tag is a strong clue.
I think write cycles are also a lot higher.
Probably more overhead for longer wear leveling
02:42
@JourneymanGeek Stack Exchange probably have one in each dev workstation
And two for the accountants
@Mark One? They've probably got 4 in each setup as a hardware RAID10
You know, for speed.
Proposed: If you like a given technology, you haven't used it enough
3
Or you didn't invent it.
@JoelESalas I'm recompiling a new kernel right now. Looking forward to new functionality and breaking it a 100 different ways
03:20
@MarkHenderson Oh Australia.
@ChrisS cflags, yo.
03:38
Dagnabbit people, make your boxes reply to ICMP echo requests.
NO WAIT MY BAD. I forgot about the sekurities.
Yeah, you don't want people to know there's a server at your IP address....oh wait, you're running a web site. WTF?
04:17
@WesleyDavid It defaults to -O2, good enough and doesn't cause odd problems.
I despise Apple's Mighty Mouse and the bluetooth keyboard.
This mouse is so small and low profile, I'd need to be a first grader to comfortably use it.
The keyboard is similarly cramped, and the keys have the most unsatisfying tactility of anything I've typed on.
Oddly, the Air's own keyboard feels nice, and the touchpad is one of the only ones I've been able to use on any laptop in my life.
I just don't want to use them lest I get the shiny wear spots on them. I'm anal about that sort of thing.
So, you apply for job, month later recruiter contacts you for initial screen, sets phone screen and later that night sends a personal LinkedIn invite? Huh?
@WesleyDavid: Oh, I manage to wear the keys on my thinkpads shiny within 3-4 months ;p
@Adrian Recruiter must have had the screws turned on them and is in panicmode.
@JourneymanGeek Beastmode: enabled.
Yeah, that's what I'm thinking.
04:30
@WesleyDavid: I type a lot ;p
@WesleyDavid apple touchpads are some of the best around. :|
@Tacticus Very much so, yes.
I'm thinking of getting the big touchpad bluetooth monolith thingy.
Attempting to be genuinely productive in 3... 2...
@WesleyDavid Bahaha good luck with that
I shall now post lolcats to keep you amused and away from real work
gouges eyes out HA!! Now try to distract me! Oh wait...
Dammit. I pulled a @mikeyb and forgot the root password for this box.
^ That's not a cat. That's a 2-year-old
04:42
I always put this stuff in my password files. Except, apparently not this time.
At least it took me more than 5 minutes to forget it though.
(substitute catnip for potato chips)
@WesleyDavid KEEPASS! DO YOU HAVE IT?
@MarkHenderson Yes, and Secret Server. Apparently I didn't use them though.
well shit
@WesleyDavid Nah I'm good I went this morning
@MarkHenderson AT WORK?!
@WesleyDavid Fuck no
I will poop at work before 8am, because nobody else is here yet
So if I go to the bathroom and the lights are off, then I know it's fair game
But if I go there and someone else has turned the lights on, too much risk
04:46
32
Q: Will everyone having Globally Accessible IP's in IPv6 be kind of a security nightmare?

leeand00I'm thinking about the way that in IPv4 most of the time you have a single point to configure a firewall on, mainly your router, but if everybody has a Globally Accessible IP Address, doesn't that mean that each computer user is basically responsible for managing their own firewall? (I mean I'...

Is this or is it not an exact duplicate?
@MichaelHampton Thats an old one isn/t it?
25
Q: Switch to IPv6 and get rid of NAT? Are you kidding?

ErnieSo our ISP has set up IPv6 recently, and I've been studying what the transition should entail before jumping into the fray. I've noticed three very important issues: Our office NAT router (an old Linksys BEFSR41) does not support IPv6. Nor does any newer router, AFAICT. The book I'm reading ab...

@MichaelHampton ANSWER: yes. /thread
This latter one being the older, and much higher traffic question.
Looks like a dupe to me
04:48
"IPv6 - the consequences will never be the same." --cyberpolice
Well, the close votes expire before anybody sees them in /review, so it would need a mod to close it as duplicate, I think...
Already done
@MichaelHampton Looks like it was an SO migration before they were permanently marked as one
Actually maybe not
Strange, I don't see the migrated block on either question.
@MichaelHampton Nah my mistake, i was having 3:30-itis
That'll end around 5 pm.
04:52
4.30 when I go home YIPPEE
40 minutes to go
runlevel 1, suckahs!
1 is the loneliest number...
05:12
I think that's the first time I've flagged a copyright violation...
@MichaelHampton We've had a few flags like that
We generally give them a ban, no warnings
The answer is almost two years old.
Hmm
He's actually done what we asked himi to do
Link and copy the relevant part
If you like The TCP/IP Guide enough to want your own copy in convenient PDF format, please license the full Guide. I would also appreciate it if those who are using the Guide extensively for commercial purposes would license it.
@MichaelHampton Hmmmmmmm
I dunno, we're not copyright enforcers really. We ban for plagiarism, but that's not plagiarism as he states where he got it from
05:16
The rest of the site says things like "All rights reserved" and I can't find anything else about Creative Commons or other such things that might make me think the author would be OK with this.
I dunnno
I'm going to leave it there cos I don't see anything too wrong with what he's done
I'll leave the flag for another mod to decide on
We're always, always telling people "Don't just link, link and copy the relevant part!"
Frankly that's the bigger crime than taking a small part of one part of a book
True. And it's a very small relevant part, at that. Which maybe falls under fair use. But this guy's clearly trying to make money from the sale of this book, which makes me suspect it's more of a problem here than it would be otherwise.
I don't think I'd go so far as to ban the user, though.
Well I don't want to speak on his behalf, but I would say that sounds like free advertising to me then
And frankly that answer is better than the one above it
Well, someone else can decide on it. I just thought it was a bit too far off to the dark side of the gray area.
I'm going to leave the flag and we'll nut it out with some of the other mods
05:20
Works for me. I've done my part :)
TomTom was suspended? That's something.
@JeffFerland NOOOOOOOOOOOO!!!
@JeffFerland WHAT?
The big problem with copyright is where "fair use" ends and "infringement" begins.
No way
Fuck he is too
05:29
@ChrisS the problem with copyright is Lars Ulrich.
I normally review the mod actions when I come on in the mornings but I didn't yesterday
"fair use" in the US is generally 10% of less of the identifiable copyrighted material. So copying the whole thing is a clear violation. But there's places where it gets good and gray, I stay out of that as best I can.
@MarkHenderson Can you see what he was banned for? And how long?
@WesleyDavid I can and I can
And unlike a rolling stone, he's collected plenty of moss (i.e. flags) lately
So it's justified
I also know how many times he's been banned in the past, and this is now his 3rd sinbin offence, which is normally a 12-month ban. We're obviously a bit softer on our favourite alcoholic.
Anyway, home time
Cya all tomorrow
@MarkHenderson So... no linky to some of his offending posts?
Fine, fine. I'll do my own homework
05:36
@WesleyDavid Like one is different from the next.
What happens if I upvote TomTom's stuff while banned? Does he lose the rep?
@Adrian He'll get it just the same; he just shows 1 rep during the suspension.
05:58
ahh, that explains why he's on SU ;p
@MarkHenderson Found another one
5
Q: IPv6: the end of NAT?

user75602Is NAT going to disappear with IPv6? What about during the "transition" from IPv4-IPv6? How are we all going to access the internet then?

5
Q: Do you think NAT is largely responsible for the delay in IPv6 adoption?

Rob GI'm wondering if this is really the case, or, if when IPv6 does get widespread adoption, we will still hide all the machines on a network behind a single (or few) IP address under the assumption that this is more secure - or will we finally be able to configure our firewalls to handle all of that...

 
2 hours later…
08:06
G'day
08:34
good morning
Dan
Dan
Serious question, is he trolling me:

http://serverfault.com/a/441221/95832
@Dan No. Data is genuinely recoverable after having been overwritten once.
Dan
Dan
@MilesErickson I really don't believe you
How's that even possible?
@dan I'm never quite sure how to take John at times. Overall he seems like a decent knowledgeable guy but he's very dogmatic about some things.
I've read studies that say it is recoverable. I've read studies that say it isn't reliably recoverable. I've read some that say that while it might be recoverable in theory, no one's shown it working in practice with real (e.g. randomised, unpredictable) data.
Dan
Dan
This is basically my understanding, regarding the Gutman thing which people tend to site (And what I was thinking of when I mentioned magnetic resonance):

http://blogs.computerworld.com/node/5687
08:39
@dan Except: modern hard drives may not have quite the same "remnant data" issues that older devices had, because they are actually pushing the limits of the physics in terms of molecules per bit or whatever.
Dan
Dan
@MilesErickson See my link and what @RobM says. To my knowledge, no one has ever taken an overwritten modern (I.e., last 10 years) hard drive and recovered anythign meaningful
There's a big difference between writing a known, predictable pattern to a hard disk, erasing it and then finding traces of a pattern you can search for because you know it was there and you know what it was and me unplugging the 2nd drive from my work PC, handing it to you and saying "pick the bones out of that"
Dan
Dan
The other point, which I can't be bothered to try and make over there, is that you have the kind of data that someone is going to try this hard to recover, then really, you shouldn't ever have anything resembling a hard drive at the end, anyway!
Also, John is claiming he got the data back with a normal off the shelf "recovery program" and I call complete bullshit on that
Morning strangers
@Dan Agreed
I don't like that one because they proscribed disassembling the drive, which I presume to be a prerequisite for "impossible" data recovery in the event that it is in some context possible.
Dan
Dan
08:48
@MilesErickson Yeah, that spoils it a bit given that we already know that some drive failure types require disassembly and that it works / is possible
"Although not required, it is highly recommended that the hard disk drive be physically damaged prior to release."
In theory, if stuff has been "overwritten" it's impossible to recover, but in reality it's probably not.
My most security-sensitive client agrees. They do not mess around with /dev/zero or even DBAN. They use a drill press.
It's impossible to know everything about every computer thing ever, so I suspect he's right.
Dan
Dan
@MilesErickson Yeah but that's the NSA where, feasibly, a foreign entity would spend millions trying and maybe even keep hold of it for years. Additionally, it costs nothing to simply trash it and walk away
08:50
I've had to have (non glass) platters ground down in the past
Dan
Dan
@tombull89 I disagree, I really do think it's impossible with any current technology
@Dan I bring it up because if anyone can recover previously overwritten bits, the NSA can.
@Dan it is likely possible if you have sufficient $$$ -the military & governments don't take chances with high level data
Dan
Dan
@MilesErickson Yeah, but they're also going to the be the very definition of risk adverse. I can't say they can't, but it's not like they have access to special physics. If it's possible then a commercial company will suss it out eventually anyway
@Iain Possibly how, though?
At best we have a vaguely theoretical article for very old drives.
@Dan I've no idea I've never worked for an angency that would need to do it and if I had I likely couldn't say
Dan
Dan
08:53
@Iain Back to the original thing - has John done it using cheap and cheerful off the shelf data recovery software? No.
Data remanence is the residual representation of data that remains even after attempts have been made to remove or erase the data. This residue may result from data being left intact by a nominal file deletion operation, by reformatting of storage media that does not remove data previously written to the media, or through physical properties of the storage medium that allow previously written data to be recovered. Data remanence may make inadvertent disclosure of sensitive information possible should the storage media be released into an uncontrolled environment (e.g., thrown in the trash...
I dunno
@Iain, if something get flagged as spam, does the user instantly get the -100 rep hit, after a mod marks as "valid" or after 5 people mark as spam and it gets deleted?
[that link actually points directly to #Feasibility_of_recovering_overwritten_data under the above]
09:01
@ColdT I think he means the profile.
@tombull89 can't be that difficult can it? user accounts > remove profile, and then remove the relevent registry key
ahh suppose its easy when you know it
Dan
Dan
Can anyone can weigh in on how to get to the properties page on Vista - I can't remember if it's the same as 7
I think it is but don't have a copy handy to make sure
@Dan properties page?
Dan
Dan
@tombull89 Computer Properties - "Advanced System Settings" on 7, or what you get if you right click computer and select "Properties" on XP
09:17
system n maintenance from control panel and then click on system (i think)
but then again i would have assumed its the same for win 7 too
09:30
oh balls.
*.imgur.com has been blocked here >:(
haha god damnit.. been troubleshooting some weird performance problems and rapid disconnect/connects on our iSCSI SAN the last weeks
turns out that EMC replaced one of the SP's due to a fault without retaining MTU settings
so we had 9000 bytes on one controller and 1500 bytes on the other
oh :(
@tombull89 aren't you in charge of that ?
09:45
@Iain we've got in house and out-house filtering - it's blocked upstream by the school's ISP.
ah
vpn to home for you then !
Dan
Dan
SSL Tunnel for the win!
I'm surprised it's not been blocked before because there's a lot of NSFW stuff on the main site, I just wish they'd left the subdomains alone.
It's not a major issue as I've got a "technician proxy" which allows us to log in and bypass a lot of the higher up filtering, but for imgur I'm not too fussed.
Dan
Dan
@tombull89 AKA "Porn proxy"
@Dan Well, not that high up ;) that's probably blocked at levels I don't have access to.
09:51
Does this guy think he's kofi annan or sommit ?
When I did my apprenticeship they had a monitoring system that logged everybody's keystrokes and scanned the webpage they were reading. If it found anything unsavoury it took a screenshot and emailed it to the network manager.
He got a lot of emails.
Dan
Dan
@tombull89 Securus? :)
@Dan That's it! Couldn't remember the name but it was a brilliantly evil bit of kit.
Dan
Dan
@tombull89 I'm going to redact my next statement
@Dan Why's that? MOFO to set up?
Haha. I'm not there any more and I never met the guy, it was there when I started and it was there when I left.
Dan
Dan
09:54
@tombull89 Oh, I'd forgotten that bit, I could spend a week redacting statements like that :D
I dare say it had it's uses in the school though.
@tombull89 I've never understood why people need to monitor things so deeply
are americans really that afraid of someone looking at a tit/dick/pussy on the net? what is the big issue?
@pauska In a (UK) school, it's more cyber bullying and "protecting" the children.

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