I just changed the scheduler from the default cfq (which is said to
have the best multiuser performance) to anticipatory and then
deadline. Wow, what a difference. Anticipatory takes about 10 seconds
to list a directory of 5,000 items under load from dd, and deadline
takes about 5 (yes, i dropped t
I have Debian Etch AMD64 installed on a Dell PowerEdge 1950, connected
to a MD1000 (SAS/SATA array) via a PERC5/e SAS controller. The array
is RAID5. The whole drive is LVM, 9TB are one big XFS partition.
Linear reads/writes are very fast, directory listings are also fast.
However, if the disk is
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