[dm-devel] Shared snapshots

[张宇]

both of the origin device and the snapshot device can't be resized
dynamically?

2010/1/7 haad <haaaad at gmail.com>

>  On Thu, Jan 7, 2010 at 9:42 AM, Pasi Kärkkäinen <pasik at iki.fi> wrote:
> > 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?
>
> No all snapshots share one, common exception store I think.
>
>
>
> --
>
>
> Regards.
>
> Adam
>
> --
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>
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