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To: xfs@xxxxxxxxxxx
Subject: Re: TRIM on XFS
From: Jeffrey Hundstad <jeffrey.hundstad@xxxxxxxx>
Date: Mon, 10 Oct 2011 17:04:43 -0500
In-reply-to: <CAGpXXZJs8kjZaSp248rA+-d=gpwWe=oK0xtUUirv+zgE3Vq3kA@xxxxxxxxxxxxxx>
References: <201110071352.20135@xxxxxx> <20111007233450.GK3159@dastard> <201110100829.45823@xxxxxx> <CAGpXXZJs8kjZaSp248rA+-d=gpwWe=oK0xtUUirv+zgE3Vq3kA@xxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111005 Icedove/3.1.15
On 10/10/2011 03:28 PM, Greg Freemyer wrote:
fitrim is the batch mode.

To enable realtime discard, add --discard to your mount options.

Documented athttp://lxr.linux.no/#linux+v3.0.4/Documentation/filesystems/xfs.txt

To invoke batch mode, simply use fstrim from user space.


I'm also trying to use FITRIM on a simple XFS partition on a spinning magnetic hard drive (remember those). I haven't had much luck. I'm doing this just to get used to the commands when using this against a thinly provisioned disk. I have no idea if this should work in this configuration.

On a Debian system with Linux 3.0.0-2-amd64 when I issue:
# fstrim /

I receive:
fstrim: /: FITRIM ioctl failed: Operation not supported

With an strace this looks like:
open("/", O_RDONLY)                     = 3
ioctl(3, 0xc0185879, 0x7fff4ea851b0) = -1 EOPNOTSUPP (Operation not supported)

My fstrim is from util-linux-2.19.1-5

I'd be happy to try to diagnose this further if people are interested. Any suggestions where I should start would be much appreciated.

Jeffrey Hundstad

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