Re: twa driver, 3ware 9500s-4lp, speed issue

Oliver Brandmueller <ob_at_e-Gitt.NET> writes:

> We had reproducably very bad experiences with 8500 and 9500 3ware disk 
> controllers in combination with Raptors. After a while (this can be 
> hours or weeks) one of the disks was detached from the RAID ("drive 
> timeout"). You could remove it with tw_cli, when trying to rescan it was 
> not found, until the disk was physically removed or the machine was 
> switched off (only rebooting was not enough): This means the "failed" 
> disk needed to be powercycled.

I'd probably replace the drives by a different make or at least model;
the earlier 36 GB Raptors at any rate - check storagereview.com why.

Checking/improving drive cooling may be worthwhile though.

> We switched to the slightly more expensive ICP Vortex controllers in our 
> new machines and will be replacing the old 3wares in the older
> machines.

Does replacing the adaptor help when the drives lock up?
I doubt that.

My ancient Micropolis 4345WS drive in a test computer w/ FreeBSD 4.X
locks up randomly regardless of the SCSI adaptor (no RAID), I've tried
three different chips, Tekram DC-390 (AMD 53C974), DC-390U (SYM53C875),
Adaptec 2940UW Pro (AIC 7880) - the problem remains. Must be the drive
then in my case.

-- 
Matthias Andree