On 6 Nov 2010, at 19:28, Bob Ball wrote:
> I intend to be VERY careful with this. Thank you all. Any further
> advice before I do this, likely on Monday, will be greatly appreciated.
I believe it is possible to use udev to assign device names to devices which
would make the pathname both consistent across boots and configurable. If it
isn't possible with udev then I know it's possible with multipath as we always
use this on DDN systems (I work for DDN), it both handles failover between
devices but also allows them to be named as we choose. I'm not saying we're
not careful ourselves but you need to be a lot less careful if you are working
with /dev/mapper/ost_24 than you do if you are working with /dev/sdj
Basically install device-mapper-multipath and add the entries to
/etc/multipath.conf.
On one of our test systems in the lab we have the following currently, this is
a virtual test system so only single path to each device.
/dev/mapper/ost_sab_1
4128448 1579584 2339152 41% /lustre/sab/ost_1
/dev/mapper/ost_sab_0
4128448 1278200 2640536 33% /lustre/sab/ost_0
Ashley.
--
Ashley Pittman, Bath, UK.
Padb - A parallel job inspection tool for cluster computing
http://padb.pittman.org.uk
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