Hi list,
I know this question has been asked zillion times, but I'll ask it again,
because as most lustre-builder wannabe, I'm worried about MDS being a
bottleneck.
I'm planning to build a 60TB lustre install separated in two pools :
- one big / slow / cheap 50 TB archive based on Dell MD3000i+MD1000 RAID 5 OST
with two cheap OSS in front of it
- one beefier (=smaller / faster / more expensive) 10 TB based on 2 servers
being both OSS+OST each composed of 8 cores, 12 GB RAM, 8 NL SAS spindles RAID
10.
the big / slow archive is not really a problem but i'm asking myself about the
smaller one, given the fact that this storage (if good enough in terms of
performance) could double pretty soon by adding more OSS+OST
I've been planning to have one redundant MDS over 2 Dell R610 sharing a common
sas-attached MD3000 RAID 10 MDT.
I've noticed that this array is not the best on the market for perf. but is
rather good at $$...
I plan on connecting all this on DDR infiniband (along with the main clients -4
of them-).
So now for my questions about MDS :
- Should I do better having two lustre installs instead of a single install
with two pools ?
- Should I consider buying a better array for MDT ?
- Should I be better using even beefier MDS with internal storage and DRBD ?
and about OSS :
- should I take "smaller" OSS+OST to improve perf ?
- should I split my OST storage "inside" the OSSes for the 10GB storage pool ?
I'll be sooo grateful if someone could answer those, I'll be glad to provide
any other details one would need to help me out.
Thanks.
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