[CentOS] xfs question

[m.roth at 5-cent.us]

John R Pierce wrote:
> On 8/4/2015 7:14 AM, m.roth at 5-cent.us wrote:
>>
>>  CentOS 6.6 (well, just updated with CR). I have some xfs filesystems
>> on a RAID. They've been mounted with the option of defaults. Will it break
>> the whole thing if I now change that to inode64, or was that something
>> I needed to do when the fs was created, or is there some conversion I
>> can run that won't break everything?
>
> you can enable that option at any time, but once you've used it, you
> can't go back.
>
> note that 64 bit inodes cause a minor issue with NFS if you have shares
> exported other than the root.  there's an easy workaround.

Thanks, John. I believe I did exports elsewhere, last year. This just came
up on a huge backup RAID - the rsync was failing, though there was plenty
space, and inode64 just popped up from my stack - it was just the
conversion that I didn't remember the answer to.

For those looking at this, here's a gotcha: you *cannot* change fstab,
then mount -o remount, you *must* umount, then mount. Merely -o remount
fails to make the change.

      mark