[Lustre-discuss] Hardware Question

Daniel Leaberry dleaberry at iarchives.com
Fri Oct 5 10:47:11 PDT 2007


Daniel Leaberry
Systems Administrator
iArchives
Tel: 801-494-6528
Cell: 801-376-6411



Aaron Knister wrote:
> In what sense does it start thrasing? I'm thinking about building a 
> poweredge with 8 cpus and 16GB of mem to handle 3x 9TB luns. Does that 
> sound sane?
We run heavy amounts of small files. We start thrashing when the disks 
can't keep up. CPU really doesn't have much to do with it. If you're not 
running a lot of small files you'll probably be fine.

Daniel

>
> On Oct 5, 2007, at 1:02 PM, Daniel Leaberry wrote:
>
>>
>> Aaron Knister wrote:
>>> I'm planning to hang 58 terabytes off of a PowerEdge 1950 with 4 
>>> CPUS  and 8 gigs of memory. My MDS is a dual core Opteron with a 
>>> 250gig  raid1 metadata volume and 2GB of ram. Do you think this 
>>> hardware  configuration is sane?
>>>
>>> -Aaron
>>>
>> Depends how much you push your disks. Your waiting on io will shoot 
>> up real quick if the disks slow down even a bit. My experience is 
>> you'll probably want more machines unless you're not pushing your 
>> disks (in which case why run lustre?)
>>
>> We have about 85TB of disk (in 24 luns) hanging off 4 PE2950's with 
>> those same specs. They are set up in failover pairs (each handles 6 
>> luns) but I can't run too long on a single machine before it starts 
>> thrashing when it takes over the other nodes 6 luns.
>>
>> Daniel
>>
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>




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