Testing 16 disk configurations takes how long?

[Thomas Neumann]

On Monday, March 18, 2013 07:04:18 PM andrew bezella wrote:
> On Sun, 2013-03-17 at 19:34 +0100, Thomas Neumann wrote:
>> @Andrew: I'm wondering if your configs are reliable, Let me explain:
>>   disk_config /dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0
>>   disklabel:gpt-bios align-at:1M [..]
>>   disk_config /dev/disk/by-path/pci-0000:00:1f.2-scsi-1:0:0:0 sameas:sda
>> 
>> What happens if for some reason 'sda' is something else then
>> [...]-0:0:0:0?
 
> while not bullet-proof, they're reliable in our environment.  our
> hardware config is 2 internal drives for a mirrored os (w/no archival
> data), and then either 24 or 36 hot-swappable data drives.  the
> disk/by-path enumeration for each server class should be the same[1],

> [1] my (certainly limited and possibly outdated) understanding is that
> the by-path listings (udev's ENV{ID_PATH}) are not dependent on the
> order devices are seen by the kernel.

That's correct.

> and the paths for the internal and external drives are quite different
> (iirc external disk/by-path for our hw actually stopped working sometime
> between jaunty and lucid).  anyway, if both internal drives don't show
> up where i expect them by-path, fai will error out (which is the
> behavior i want).

Ah. Okay. Should be safe then.

bye
thomas