Lustre discuss - Jan 2008 - Questions on MDT inode size

Hi,

The documentation warns about using smaller inodes than 512 bytes on the
MDT. If I plan to use a stripecount of one (I have many small files), is
it possible to use an inode size of 256 bytes and still use in-inode EAs
for metadata ?

Thanks 

/Jakob

On Jan 28, 2008  17:21 +0100, Jakob Goldbach wrote:
> The documentation warns about using smaller inodes than 512 bytes on the
> MDT. If I plan to use a stripecount of one (I have many small files), is
> it possible to use an inode size of 256 bytes and still use in-inode EAs
> for metadata ?
Yes, this will fit (up to 2 stripes), but you may encounter performance
problems in the future if ACLs, user xattr, kerberos, etc. are ever used.

In general, the MDS storage is very small compared to the other usage so
the 512-byte inodes are not a significant limit.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.