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Re: [linux-lvm] cache buffer size

On Thu, Nov 07, 2002 at 05:58:01PM +0100, Heinz J . Mauelshagen wrote:
On Wed, Nov 06, 2002 at 11:17:05AM -0600, Steve Best wrote:
Indeed snapshot exception table ios go by blocks of 1k.

Puting the snapshot store on the same device as the original is not
recommended in general for performance reasons.

In case 1k blocks are possible with JFS:

if snapshots are used regularly and there's no seperate PV to put the
snapshot onto, you might want to create a 1k blocked jfs and try if
that performs better than the RAID 5 stripe cache flush penalty with the 4k
blocked filesystem.

hello, is there any chance of having snapshots with 4k blocks for the exception table (configurable), i want to use snapshot for backing up my root vg but i also have swap there and it is locked to do page-sized io (4k on ix86).


Luca Berra -- bluca comedia it
       Communication Media & Services S.r.l.
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