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location Virginia
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visits member for 5 years, 7 months
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Jul
15
comment Is it possible that just one bit switches so my file shows me a letter “Q” instead of a “S”
@psusi Not impossible, as you just need enough bit-flips in the sector to make the ECC come out right. Unlikely, but possible, and disk manufacturers quote high enough error rates that you really ought to expect to see some. I've heard rumors that ZFS folks see them (due to ZFS-level data checksums)...
Jan
18
comment Making SD card corruption-proof
See unix.stackexchange.com/questions/26516/…
Dec
3
comment Do wifi packets go directly node to node?
If you can switch from 2.4 to 5.x GHz, that'll help greatly with noise. There is a lot less noise on the 5GHz bands (because its less common, and also because its better blocked by walls). Of course, its better blocked by walls, so you may have signal strength issues, depending.
Nov
21
comment How do I make Linux recognize a new SATA /dev/sda drive I hot swapped in without rebooting?
acpiphp is for PCI hotplug, i.e., hot adding and removing PCI cards. Some expensive systems support this. And also many hypervisors.
Oct
22
comment OpenVPN performance: how many concurrent clients are possible?
BTW, there isn't any reason you can't lower the rekeying interval (there is a security tradeoff, in that a key being compromised will reveal plaintext back to the last rekeying). Also, I'd be much more worried about the routing or other connection-look-up failing first. I mean, if OpenVPN is intended to have <100 connections active, what's the chance there there is an O(n) lookup of a connection somewhere?
Aug
14
comment How to stop people from using my domain to send spam?
Please go ahead and edit your post to correct it… that's one of the many encouraged reasons to use the edit link.
Aug
13
comment How to stop people from using my domain to send spam?
No, it relies on the SMTP "envelope" sender (and recipients, too) (the ones sent in the MAIL FROM command), which can be completely different than the From: header.
Jan
30
comment Anybody tried to use graphic card as a precision clock on a Windows server?
I hope you mean NTP, not NNTP. Doing time sync over NNTP would be, I dare say, a sign of insanity.
Jan
10
comment Recover RAID 5 data after created new array instead of re-using
FYI: for a while, its been possible to have partitioned md arrays. Originally, they had their own mdp devices, but as of Linux 2.6.28, all md arrays are partitionable. The mdadm manpage has some details. So the OP may need to reconstruct a partition table as well...
Dec
26
comment How do I append a specific number of null bytes to a file?
Its much faster because it'll generate a sparse file, which is what you want most of the time—but if you don't want a sparse file, the dd approach will work.
Dec
19
comment RAID layout for terminal server usage - what are my options?
@Matthew: RAID-6 write performance doesn't have to be that bad. If you're writing large files (so you write the entire stripe at once), with a 14-disk RAID-6 you write 12 disks of data and 2 disks of parity. That's actually much better than RAID10, where you write 7 disks of data and 7 disks of mirror. The problem is when you're not writing the entire stripe, as you get the infamous read-write cycle (read 1 disk of data + 2 disks of parity [or all 12 data disks if you're verifying], write 1 disk of data + 2 disks of parity).
Dec
14
comment Kindly help me on how to handle the hacker
What are these URLs he's hitting? Don't need the domain, just the path (e.g., http:// www.domain.com/ path)
Dec
5
comment Server RAID died. How would you recover data from its drives?
Better yet after your dd, attempt recovery from the backup. That way, if it turns out your dd didn't work, you can do it again.
Nov
28
comment Do user permissions differ in case of different groups?
@Trott: Actually, it's probably a better match for Unix.SE. Or, if these are Ubuntu machines, AskUbuntu. I'm guessing StuckAgain is not a professional sysadmin, the main target audience for ServerFault.
Nov
18
comment bind9 upgrade on Linux lenny distribution
debian.org/releases may help some, as might debian.org/security So does the actual bind9 DSA at debian.org/security/2011/dsa-2347
Nov
18
comment bind9 upgrade on Linux lenny distribution
Well, the obvious answer is that the server is connected to a network, maybe even an internet, but not the Internet. (Having name resolution on your internal networks is quite useful, even on networks which aren't connected to the Internet for security or cost reasons)
Nov
18
comment bind9 upgrade on Linux lenny distribution
FYI, Lenny is currently oldstable and still has security support. Including the recent bind9 DSA.
Nov
18
comment bind9 upgrade on Linux lenny distribution
Please don't re-ask it, instead wait for the moderators to move it over for you. You can also flag your own question to ask for a move, I believe.
Nov
10
comment How much SWAP space on a high memory system?
@warren: OK, I'm running OpenJDK on 64-bit, with Xmx and Xms the same. But I'm not sure how java would force itself to swap, the only syscall close would be madvise, but that won't fail... that bug talks about running out of memory during garbage collection. Adding swap prevents that, of course, but so would adding RAM. Maybe its due to 32-bit with PAE?
Nov
10
comment How much SWAP space on a high memory system?
@warren: I have Tomcat instances, each in excess of 3GiB, yet using no swap (and one is using hugepages, and thus can't be swapped). Not sure what you're talking about.