[Lustre-discuss] ost pools

[Andreas Dilger]

On 2010-08-10, at 01:20, Stu Midgley wrote:
> # lctl pool_add l1.default l1-OST[10]
> OST l1-OST0010_UUID is not part of the 'l1' fs.
> pool_add: No such file or directory
> 
> 
> All the nodes that have the "new-style" names went into the pool just
> fine.  all the nodes with "old-style" names will not go into the pool.
> 
> eg. ost_011_UUID

I had a quick look at lctl::jt_pool_cmd(), and it looks like this checking is done in userspace in check_and_complete_ostname(), to avoid bad interactions with invalid OST names, and to allow "short" forms of the OST to be used (e.g. OST0001 instead of l1-OST0001_UUID).

That said, it should also be possible to have lctl scan the existing OST UUID array via setup_obd_indexes(param->obd_uuid = ost_name) to see if the OST name is actually valid before adding it to the pool.  That will iterate over the list of OSTs, and use llapi_uuid_match() to see if the OST name is valid.

>> We have a lustre file system which started life at V1.4 and is now at V1.8.
>>  I'm keen to use ost pools, but I can't actually add nodes to the pool.  The node names are not in a format that lctl pool_add likes
>> 
>> ost_011_UUID                3.3T        3.0T      331.5G  90% /l1[OST:10]
>> 
>> lctl pool_add l1.default "OST[10]"
>> OST l1-OST0010_UUID is not part of the 'l1' fs.
>> pool_add: No such file or directory
>> 
>> How do I get nodes with these names added to a pool?
>> 
>> Thanks.
> 
> 
> -- 
> Dr Stuart Midgley
> sdm900 at gmail.com
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Cheers, Andreas
--
Andreas Dilger
Lustre Technical Lead
Oracle Corporation Canada Inc.