[dm-devel] Shared snapshots
Pasi Kärkkäinen
pasik at iki.fi
Thu Jan 7 08:42:55 UTC 2010
On Wed, Jan 06, 2010 at 09:38:00AM -0500, Mikulas Patocka wrote:
> Hi
>
> I uploaded new code for shared snapshots at
> http://people.redhat.com/mpatocka/patches/kernel/new-snapshots/devel/
>
> Changes:
> - two queues, one for reads and one for writes, to improve read latency
> when the device is write-congested
> - limit number of reallocations in flight (VM subsystem sends all writes
> at once and without limit it creates big lags).
> - fixed one place where it didn't handle on-disk errors
> - simplified bitmap creation, removed some unneeded code
> - new macro for error reporting, as suggested by Zdenek
> - some comments added
> - DM_ prefix added to some macros
>
> Userspace for lvm 2.02.53 is at
> http://people.redhat.com/mpatocka/patches/userspace/new-snapshots/lvm-2.02.54/
>
> Please, someone, do offensive testing with this --- i.e. apply the
> patches, try it, and try all possible lvm commands with it, try to stress
> and crash it in various ways, etc. If we wait with testing until Alasdair
> reads the code, it won't get much testing...
>
Sorry for a stupid question, but what does "shared" mean? Support for CLVM?
-- Pasi
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