14 Jul
2010
14 Jul
'10
11:38 a.m.
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