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The Next3 filesystemThe Next3 filesystemPosted Jun 23, 2010 1:41 UTC (Wed) by cmccabe (guest, #60281)In reply to: The Next3 filesystem by Cato Parent article: The Next3 filesystem
Up until Linux 2.6.31, write barriers were always disabled while using LVM. So it's unlikely that journaling would have been very effective at preventing data loss in a system using something like ext3 + LVM + Linux 2.6.28.
Personally, I use rsync for monthly backup, every month, and hope for the best. And when you see that first I/O error come out of /dev/sda... throw that thing in the trash. I've never seen a disk "get better" after starting to give I/O timeouts and errors.
C.
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The Next3 filesystem Posted Jun 23, 2010 1:49 UTC (Wed) by cmccabe (guest, #60281) [Link]
Just to clarify. I've never had to restore my data from backup drives. I have had hard disks go "funny" on me. This happened on two disks. Files started becoming unreadable some of the time (but not all) and I/O timeouts started happening. In both cases, I copied over my data from the affected disk to a new disk.
I haven't ever lost data as a result of a power outage, partly because I'm a compulsive user of the save button / command. I also didn't get bitten by the ext4 rename bug / controversy because I was using ext3 at the time. I don't have a UPS at home or work.
The Next3 filesystem Posted Jun 23, 2010 12:16 UTC (Wed) by Cato (subscriber, #7643) [Link] Since I turn off disk write caching that bypasses the problem of write barriers being disabled in such kernels. For backups, I use DAR (like tar but with granular checksums for easier recovery from corruption) and rsnapshot, which is rsync-based, but a true backup system as it saves multiple versions and runs very fast, like rsync - works very well as long as you don't have very large files that change frequently.
The Next3 filesystem Posted Jun 23, 2010 13:30 UTC (Wed) by nix (subscriber, #2304) [Link] DAR (like tar but with granular checksums for easier recovery from corruption)Actually par2 provides that feature. What dar gives you is multi-storage-medium support via running arbitrary scripts to change medium. tar has nothing like it. works very well as long as you don't have very large files that change frequentlyLike, uh, VM images? I hear they're quite common these days. (If you've got a lot of those, try rdiff-backup. It's slower than rsnapshot, but when a file changes it stores rdiff-format compressed deltas from the new file to the old one, rather than resaving the entire old file all over again.)
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