Chris Mason wrote:
quoted text
> 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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