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Feb
25
comment Using SSD as disk cache
See also serverfault.com/questions/239808/ssd-for-swap-on-ubuntu-server/…, which is about swap, but the same caveats apply.
Feb
25
comment Official online RPM package browser / search for CentOS
You may also be interested in EPEL fedoraproject.org/wiki/EPEL
Feb
25
comment Official online RPM package browser / search for CentOS
It's not a web interface, but you can search packages and get metadata information with yum search and yum info.
Feb
24
comment Passing variables problem - Bash
I just tested this in half a dozen versions of bash, and it acts the way Iain and I expect. Something doesn't add up here.
Feb
24
comment Passing variables problem - Bash
Yeah, that's really weird. Bash doesn't normally work like that — brace expansion happens before $ expansion, so normally you'd get what Iain says in the comment above.
Feb
18
comment Central authentication and /home storage with caching
I'd really caution anyone against any serious new deployment of AFS. And I can't imagine someone wanting to inflict administration of it on themselves for a home network. As a specific point, while it supports client caching, disconnected operation is a different story. There's some unfinished experimental code in the development tree if you really want to be on the bleeding edge of deep left field.
Feb
17
comment What is cloud computing?
See also: serverfault.com/questions/206703
Feb
8
comment Should I use GlusterFS as storage pool for KVM/Xen virtual machines?
What's the question here exactly?
Feb
8
comment I have a perl script that is supposed to run indefinitely. It's being killed… how do I determine who or what kills it?
Running out of memory? Check the logs for oom killer messages.
Feb
8
comment Is there a diff/merge utility to compare binary files and synchronize data bit-by-bit in either direction based on differences in binary data?
If the data is valuable enough to go to all that trouble, why not use ddrescue as intended? (And, in 20/20 hindsight, why isn't it backed up elsewhere?) ddrescue does what you want not by treating zeros as magical but by deciding to overwrite based on whether it got errors. (It'll never write out new bad-read zero blocks.)
Feb
8
comment Is there a diff/merge utility to compare binary files and synchronize data bit-by-bit in either direction based on differences in binary data?
I think you should change the subject of your question to reflect that you're not looking for a general-purpose tool to synchronize based on just any differences in binary data.
Feb
8
comment Is there a diff/merge utility to compare binary files and synchronize data bit-by-bit in either direction based on differences in binary data?
Yeah, rsync doesn't care about your special-case.
Feb
8
comment Is there a diff/merge utility to compare binary files and synchronize data bit-by-bit in either direction based on differences in binary data?
So, really, the answer here is "use the ddrescue version". And, if your bad source drive is still functional at all, you can run ddrescue on it again with the same output file as many times as you want until you've extracted the most possible data.
Feb
8
comment Is there a diff/merge utility to compare binary files and synchronize data bit-by-bit in either direction based on differences in binary data?
I think it's very likely, given what you've described, that such an overlap is very common in your destinations. In fact, it's most likely that ddrescue has gotten everything the dd copy does plus, possibly more hopefully more correct data which dd just gave up on.
Feb
8
comment Is there a diff/merge utility to compare binary files and synchronize data bit-by-bit in either direction based on differences in binary data?
@purefusion -- you've got a very special case where the only errors you expect are zeroed-out blocks. I don't think any existing programs are built to deal with this, since it's such a narrow problem. But even if you do make or find something, what are you going to do about overlapping bad areas from your two sources?
Feb
8
comment Is there a diff/merge utility to compare binary files and synchronize data bit-by-bit in either direction based on differences in binary data?
Rsync does, in fact, use an intelligent binary-diff algorithm, although it works on a block basis rather than bit-by-bit. rsync.samba.org/tech_report/node2.html
Feb
8
comment What is consuming so much memory?
40 × about 20mb each = most of your RAM right there.
Feb
8
comment What is consuming so much memory?
2) /etc/fstab, probably. Again, really a whole separate question, and probably best on unix.stackexchange.com
Feb
8
comment What is consuming so much memory?
1) Look in your apache configuration, /etc/httpd/conf/httpd.conf. Configuring that properly is actually a whole 'nuther question.
Feb
8
comment Which motherboards support ECC RAM and USB 3.0?
Honestly, if you want it to be highly reliable, what you do is: 1) buy more than one and set them up in a HA configuration and 2) don't piece it together yourself; buy from a vendor who will fix it in N hours if it fails.