Chris Mason wrote:
On Fri, 2009-04-24 at 01:34 +0200, Tomasz Chmielewski wrote:
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?
Writes would go to the page cache only (not O_DIRECT) and the metadata
wouldn't get flushed with each write (not O_SYNC).
What about the "administrative" part of using btrfs as a volume manager?
For example, I can partition (fdisk + kpartx), extend volumes in LVM
easily, on the host.
Are there any tools to "partition" or "extend" file images?
qemu-nbd and nbd-client come to mind, but it's a bit of an overhead (in
typing, I mean).
--
Tomasz Chmielewski
http://wpkg.org
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