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seen May 18 '11 at 2:35

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Apr
12
comment Linux-based file replication: file-level or block-level?
The trick with rsync is that one end will read the entire file to find changed blocks. You're talking a 10-30GB file. If you are going to do block-level synchronization, you absolutely want a layer that was keeping track of which remote blocks were stale as they were modified. Then a sync begins transmitting data almost instantly. I don't know how efficient DRBD is at this, but many storage vendors specialize in just this facet, even over a WAN, for disaster recovery.
Apr
12
comment PAM: how to enforce AD group membership during login
We used something similar, but had purchased Quest Authentication System that made AD groups available under Linux. Then the above commands work as expected. Logins require membership in a specific group that is defined in AD.
Apr
12
comment How can I reduce resource usage when copying a large file?
rsync will copy files locally. Think rsync --bwlimit=28000 foo.frm /bar/foo.frm and then watch it with iostat. I'm not sure why vmstat would tell you if you were saturating a drive. Look for %busy in iostat.
Apr
12
answered How can I reduce resource usage when copying a large file?
Apr
10
answered Suggestions needed to debug why ps -ef gets stuck
Apr
5
comment linux clustered Filesystem
According to Oracle's page on OCFS2m (oss.oracle.com/projects/ocfs2), it is only available for Unbreakable Linux. I smell lock in and a desperate attempt to not support Red Hat or it's derivative, CentOS. I like it's list of features, just not its future. They seem to be doing the same thing with Lustre. That said, Red Hat is trying to lock people in with GFS, but I wasn't all that impressed under RHEL 5.
Apr
5
comment linux clustered Filesystem
And GFS is supportable under RedHat Enterprise Linux, so odds are that you can find other system administrators who know it if you ever decide to move on.
Apr
5
answered linux clustered Filesystem
Jan
26
answered How do I make an RPM from a list of files?
Jan
26
answered Mystery stack traces in /var/log/messages
Jan
8
answered Linux that restores itself on each reboot
Dec
20
answered Reasonable threshold for system interrupts/sec
Dec
20
comment way to roll back a large file renaming/move action
I usually write a script even when I don't plan to undo it. I do it to make sure I understand the data before committing it. Database application developers do this to with data injest from a "dirty source" where the input is less than organized. Use a script to catch scenarios you hadn't anticipated. Still, hard links are absolutely the best way to go here. Instead of mv, use ln and all will be well.
Dec
11
comment Linux “locate” option not finding things
Depending upon the distribution, this command might also get it to run automatically, once per day: ln -s /usr/bin/updatedb /etc/cron.daily/updatedb although most distributions would automatically put an entry in there.
Dec
2
answered How to remotely install Linux via SSH?