[CentOS] Creating 38TB ext4 FS

[John R Pierce]

On 9/20/2013 2:27 PM, Peter Wood wrote:
> XFS worked. Thanks a lot.

for large xfs file systems, be sure to mount with option inode64.

there's one caveat on XFS in Linux, when used as a nfs export... if you 
JUST export your file system root, then you're fine, but if you like to 
have multiple seperate exports on the same file system, NFS does NOT 
like the 64 bit inode numbers, so you HAVE to specify manual arbitrary 
unique export fsid numbers.   I usually just use fsid=1,2,3,... for the 
exports.  AFAIK, they only have to be unique within the file system.   
there's an fsid=uuid option but I ran into multiple problems in my 
heterogeneous production environment with this, too.

also, natch, you should ONLY use xfs on a 64bit OS.    I think its 
intentionally disabled on 32bit, but if you were to try and force it, 
you'd get into data corruptions or kernel panics.

and, a large XFS file system requires quite a bit of RAM to do the 
xfs_check/repair (equiv to fsck)


-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast