Chris Mason schrieb:
However, with btrfs, I'm not sure about:
- what happens if SAN machine crashes while the iSCSI file images were
being written to; with LVM and its block devices, I'm somehow more
confident it wouldn't make more data loss than necessary
If iscsi is writing with O_DIRECT|O_SYNC it should work.
What if it doesn't?
But, tuning
for this config is something we have to concentrate more on.
- taking snapshots of individual files (file images on SAN) is not
possible with btrfs? Probably they would have to be placed in separate
directories first to make snapshots - some minor manageability issue
Btrfs can't snapshot a single dir, but it can snapshot a single file.
See the bcp command included with btrfs-progs.
I'd also suggest using preallocated files (via fallocate) instead of
sparse files. I will perform better in general.
When performance is needed - sure.
--
Tomasz Chmielewski
http://wpkg.org
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