From: Busby <chaimvy@gmail.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: Does dm-thin support GC (garbage collection) ?
Date: Wed, 9 May 2012 14:03:12 +0800 [thread overview]
Message-ID: <CAJv3x-WpO85tOG0Gt8ZS5JV9Z_81G4F=_gHzSjtroVogAtgm4A@mail.gmail.com> (raw)
In-Reply-To: <20120508103032.GB4034@ubuntu>
I created pool without ignore_discard feature, is this the way to
enable discard? I mounted the ext4 with '--discard' args, I will trace
whether the ext4 really issue discard later.
Thanks.
Regards,
Busby
2012/5/8, Joe Thornber <thornber@redhat.com>:
> On Tue, May 08, 2012 at 03:21:31PM +0800, Busby wrote:
>> I have tested that the blocks were reused in the other thin-lun of
>> this pool when deleted a thin-lun .
>> How can the blocks allocated for the thin-lun be dynamically
>> reclaimed? (use some method like 'discard' to tell the pool which
>> block should be reclaimed and whether the pool can reclaim it ?).
>> When I mounted a filesystem on a thin-lun, create 4G bytes file
>> firstly, the pool have decreased 4G space, then I deleted the file,
>> the pool did not increase the size as I thought, after this, create a
>> 5G file, then the pool would decrease 1G size. So I think if the
>
> Have you enabled discard support in both the thin-pool _and_ the
> filesystem? Have you confirmed that the filesystem issues the discard
> in your test scenario? (eg, via blktrace).
>
> - Joe
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>
next prev parent reply other threads:[~2012-05-09 6:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-07 7:28 Does dm-thin support GC (garbage collection) ? Busby
2012-05-07 13:22 ` Mike Snitzer
2012-05-08 5:01 ` Busby
2012-05-08 7:21 ` Busby
2012-05-08 10:30 ` Joe Thornber
2012-05-09 6:03 ` Busby [this message]
2012-05-09 13:47 ` Mike Snitzer
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