Roman,
LVM supports both sparse LVs (--virtualsize) and defragmentation
(though as you say it's not currently easy -- I started writing a script
to handle it but it's not a big enough problem that I've ever actually
wanted to use the script, still a general purpose "lvdefrag" could be
written).
Thanks,
Roy Keene
On Tue, 11 Jan 2011, Roman Mamedov wrote:
On Tue, 11 Jan 2011 19:36:30 +0100
Zdenek Kaspar <zkaspar82@xxxxxxxxx> wrote:
It makes sense to use LVM for virtualization and iSCSI to get rid of big
file images (unwanted fs overhead/fragmentation). But yes, in some use
cases this is OK.
Since you mentioned fragmentation - there are ways to both make sparse file
images, and to defragment them when needed (on some filesystems like XFS and
btrfs). But when using LVM instead of file images, the user has neither: LVM
can't have sparse LVs, and it can't (easily) defragment an LV that is
fragmented over one or several PVs. Or am I missing something here?
--
With respect,
Roman
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
