Re: [Nbd] NBD kernel module, client and server with support for TRIM

To: Wouter Verhelst <w@...112...>

Cc: nbd-general@lists.sourceforge.net

Subject: Re: [Nbd] NBD kernel module, client and server with support for TRIM

From: katon goukakyuuno <katongoukakyuuno@...223...>

Date: Fri, 16 Mar 2012 10:42:03 -0700

Message-id: <CAKx_x+ANh2egJRPSrsDoKKurEioo2VwMP9ztYk2WL8q3FWB7qA@...18...>

In-reply-to: <20120315203142.GH26123@...3...>

References: <CAKx_x+CjckUirdzKi+MxH9BfOGrNf0sXtMyYp6Xx_jbAPwL5Bg@...18...> <20120315203142.GH26123@...3...>

Thank you very much for replying! I have patched my kernel to support only TRIM. I hope I need not apply the patch for FLUSH/FUA as well to just use TRIM? I hope all patches are added to the latest Linux kernel soon!

I have also updated the nbd client and server to version 3.0 (the latest version) which does support TRIM.

How do I test if TRIM is working properly on my system? Are there any test scripts readily available; or, do I need to create a new /dev/nbd and mount a file system which supports TRIM and then try to issue some commands from userspace? I haven't completely figured out this part yet.

Thanks,

T G

On Thu, Mar 15, 2012 at 1:31 PM, Wouter Verhelst <w@...112...> wrote:

On Wed, Mar 14, 2012 at 04:15:47PM -0700, katon goukakyuuno wrote:
> Hi all,
>
> I am working on Linux kernel 3.0 (vanilla) and have 2.9.23 version of the
> nbd-client and nbd-server installed. Looking at the kernel sources, I find that
> NBD_CMD_TRIM is not supported in this version of the kernel; however, I did
> come across various threads where discussions were going on about adding
> support for the TRIM operation to NBD.

Right; as far as I know, they haven't made it to Linus yet. Paul?

> Could you please provide the link to the patches for the kernel,

On this mailinglist (and on LKML), in September last year:

http://sourceforge.net/mailarchive/forum.php?thread_name=1951246803.1122458.1315474882425.JavaMail.root%40zmail07.collab.prod.int.phx2.redhat.com&forum_name=nbd-general

> nbd-client and nbd-server

They are in nbd 2.9.24 (support for TRIM command) and 2.9.25 (using
FALLOCATE_FL_PUNCH_HOLE if available). If you need it now, you want
commits 111058e5 and 036f5246

> so that I can use TRIM in association with NBD on my system? I believe
> that the qemu kernel has been patched already. Can the same patch be
> used with my kernel as well?
>
> By the way, the latest version of nbd-client and nbd-server support TRIM,
> right?

Yes.

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