looks you forget about FS name in lctl command.
lctl pool_add want format 
 lctl pool_add $fsname.$pool_name $fsname-OST[$OST_IDX]

please try to use
lctl pool_add l1.default l1-OST[10]

> 
> ---------- Forwarded message ----------
> From: Stuart Midgley <[email protected]>
> Date: Tue, Aug 3, 2010 at 12:07 PM
> Subject: [Lustre-discuss] ost pools
> To: lustrefs <[email protected]>
> 
> 
> Evening
> 
> 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
> [email protected]
> 
> 
> 
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