[Lustre-discuss] lustre and multi path

Klaus Steden klaus.steden at thomson.net
Thu Jun 5 17:24:07 PDT 2008


Hi Brock,

Yeah, that's likely to be an issue if each host has more than one path ...

What about using HA to force one path to be inactive at the device level? I
know QLogic FC cards support this functionality, although it requires
changing the options used by the driver kernel module ... mind you,
comparing that to a solution using the multipath daemon, that's six of one,
half a dozen of the other, I'd think.

Klaus

On 6/5/08 5:09 PM, "Brock Palen" <brockp at umich.edu>did etch on stone
tablets:

> This would be for the MDS/MGS only, but thats good to know.  Problem
> is our two MDS servers (active/passive) will have two connections
> each to the same lun, so there could be issues.
> 
> Brock Palen
> www.umich.edu/~brockp
> Center for Advanced Computing
> brockp at umich.edu
> (734)936-1985
> 
> 
> 
> On Jun 5, 2008, at 7:52 PM, Klaus Steden wrote:
>> 
>> Hi Brock,
>> 
>> I've got a Sun StorageTek array hooked up to one of our clusters,
>> and I'm
>> using labels instead of multi-pathing. We've got it hooked up in a
>> similar
>> fashion as Stuart; it's a bit "slow and sloppy" when initializing,
>> but it
>> works well enough and there are no problems once OSTs are online.
>> 
>> Klaus
>> 
>> On 6/5/08 3:57 PM, "Brock Palen" <brockp at umich.edu>did etch on stone
>> tablets:
>> 
>>> Our new lustre hardware arrived from sun today.  Looking at the duel
>>> MDS and FC disk array for it.  We will need multipath.
>>> Has anyone ever used multipath with lustre?  Is there any issues?  If
>>> we set up regular multipath via LVM lustre won't care as far as I can
>>> tell and browsing archives.
>>> 
>>> What about multipath without LVM?  Our StorageTek array has dual
>>> controllers with dual ports going to dual port FC cards in the
>>> MDS's.  Each MDS has a connection to both controllers so we will need
>>> multipath to get any advantage to this.
>>> 
>>> Comments?
>>> 
>>> 
>>> Brock Palen
>>> www.umich.edu/~brockp
>>> Center for Advanced Computing
>>> brockp at umich.edu
>>> (734)936-1985
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> Lustre-discuss mailing list
>>> Lustre-discuss at lists.lustre.org
>>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
>> 
>> 
>> 
> 




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