On Wednesday 14 July 2010, Jens Neu wrote: > > I think ext3 is a bit slow on so big LUNS, try xfs or similar? > > there is no official support for xfs in RHEL5, so that is not an option. > Besides, I'm talking about a drop of >150mb/s to ~10mb/s read performance > when cracking the 2.2T size. This is clearly not in the ext3 (or FS for > that matter) magnitude of performance issues. Also, numbers stay the same > when dd'ing on the raw device (LUN). Do you see the slow behaviour (10 MiB/s) for all of the device or only for the part that is >2T? Why use a partition table at all? run dd directly against the device. If this is slow then you have a controller side problem. /Peter -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part. URL: <http://lists.centos.org/pipermail/centos/attachments/20100714/94ff4ac2/attachment-0003.sig>