On Wed, 12 Dec 2007, Timothy Shimmin wrote:
David Chinner wrote:
On Tue, Dec 11, 2007 at 11:42:50AM -0800, David Sparks wrote:
Hi all,
Is it expected that filesystems made with lazy-count=1 are not mountable
by
older kernels?
That is expected. lazy-count is a mkfs option because it changes the
on-disk
format slightly, and older kernels do not understand that format. Hence
mkfs sets a superblock feature bit to prevent the filesystem from being
mounted on kernels that don't understand the slightly different disk
format.
Cheers,
Dave.
And there will be a message in the logs but it probably isn't
overly obvious what it is talking about.
Looking at code, I presume it will come from:
if (!XFS_SB_GOOD_VERSION(sbp)) {
xfs_fs_mount_cmn_err(flags, "bad version");
return XFS_ERROR(EWRONGFS);
}
so there will be a msg about a "bad version".
--Tim
Has anyone done any benchmarks with Dave Chinner's recommendations for
mkfs.xfs/optmizations?
Justin.
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