Dave,
Thank you. I suspected this may be the case. It is awfully nice to
have a definitive answer though. It is especially nice to have a way to
determine if it is possible. Thank you!
I've created a an XFS Wiki page for this info:
http://xfs.org/index.php/FITRIM/discard
--
Jeffrey Hundstad
On 10/10/2011 09:05 PM, Dave Chinner wrote:
On Mon, Oct 10, 2011 at 05:04:43PM -0500, Jeffrey Hundstad wrote:
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.
Hello,
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)
It means the block device underneath the filesystem doesn't support
the TRIM operation. Check /sys/block/<dev>/queue/discard_max_bytes -
if the value is zero then your device doesn't support discard
operations.
Cheers,
Dave.
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