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Old 02-03-2011, 12:04 AM
Les Mikesell
 
Default RHEL-6 vs. CentOS-5.5

On 2/2/11 5:57 PM, Chuck Munro wrote:
>
> The use of the new RHEL-6/CentOS-6 'udevadm' command nicely maps out the
> hardware path no matter the order the drives are detected/named, and
> since hardware paths are fixed, I just have to attach a little tag to
> each SATA cable with that path number on it. One thing I did was reboot
> the machine *many* times to make sure the controller cards were always
> enumerated by Linux in the same slot order.

I think there are ways that drives can fail that would make them not be detected
at all - and for an autodetected raid member in a system that has been rebooted,
not leave much evidence of where it was when it worked. If your slots are all
full you may still be able to figure it out but it might be a good idea to save
a copy of the listing when you know everything is working.

--
Les Mikesell
lesmikesell@gmail.com
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Old 02-03-2011, 04:52 AM
Lamar Owen
 
Default RHEL-6 vs. CentOS-5.5

On Wednesday, February 02, 2011 08:04:43 pm Les Mikesell wrote:
> I think there are ways that drives can fail that would make them not be detected
> at all - and for an autodetected raid member in a system that has been rebooted,
> not leave much evidence of where it was when it worked. If your slots are all
> full you may still be able to figure it out but it might be a good idea to save
> a copy of the listing when you know everything is working.

I'll echo this advice.

I guess I'm spoiled to my EMC arrays, which light a yellow LED on the DAE and on the individual drive, as well as telling you which backend bus, which enclosure, and which drive in that enclosure. And the EMC-custom firmware is paranoid about errors.

But my personal box is a used SuperMicro dual Xeon I got at the depth of the recession in December 2009, and paid a song and half a dance for it. It had the six bay hotswap SCSI, and I replaced it with the six bay hotswap SATA, put in a used (and cheap) 3Ware 9500S controller, and have a RAID5 of four 250GB drives for the boot and root volumes, and an MD RAID1 pair of 750GB drives for /home. The Supermicro motherboard didn't have SATA ports, but I got a 64-bit PCI-X dual internal SATA/dual eSATA low-profile board with the low-profile bracket to fit the 2U case. Total cost <$500.
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