Red Hat Bugzilla – Bug 12285
Hardware RAID on Mylex controller slow
Last modified: 2008-05-01 11:37:56 EDT
We have three (nearly) identical boxes, all with fresh installs of RH6.2.
They are all dual PIII 550 Copermines with 4 drive SCSI RAIDs. One of them
has an IDE drive to boot from and a software RAID. It works great.
Another has a Mylex AccelRAID 150 card. It boots from the RAID, and also
works great. The third has the same Mylex card, boots from the RAID just
fine, but all disk operations are slow as dirt. Opening the case, the
access lights on all the drives are constantly flickering, and the drives
are audibly grinding - even when there is no activity on the machine.
The Mylex cards are all flashed the latest version of the Mylex BIOS and
At this point the RAID is pretty much worthless - besides being several
times slower than your average IDE drive, it is probably likely to blow a
drive within a few months just because it is grinding itself to death 24
hrs a day.
Anyone encounter this before?
This is probably a driver/firmware bug. I encourage you to contact the author of