[Lustre-discuss] Spindles versus Space

[Carlos Thomaz]

Brian,

The best case scenario is to build raid pools and have one single VD per pool (unless you have a lustre version that does not support >8 tb luns). Assumming 1.8.7 or later, don't waste your time splitting it into several vds, unless you have  reasons other than performance for that. Use 128kb chunk size.

For the MDTs I would suggest you to use RAID1 pools and stripe then using sw Linux raid manager, unless you have an EF3015 or alike dedicated to your mds sever(s).

If you need more help send us an email with more information about your storage (model, number of disks, etc) and servers, lustre version, etc.

Thanks
Carlos



On Apr 24, 2012, at 9:19 PM, "Andrus, Brian Contractorn " <bdandrus at nps.edu<mailto:bdandrus at nps.edu>> wrote:

All,

We have a DDN system that consists of several sizes of disks (1TB, 2TB and 3TB).
I create LUNs which export out to the lustre MGS/MDS/OSS. I can either make the logical drive have the same number of spindles (eg 20 disks per logical drive) or I can make them have the same amount of space (so 20 ea 3TB, 30 ea 2TB and 60 ea 1TB).
My data is mixed as well; from 1 byte to 322GB, with the average being 5mb.

What are some recommendations on how to define the OSTs?

Thanks in advance!


Brian Andrus
ITACS/Research Computing
Naval Postgraduate School
Monterey, California
voice: 831-656-6238


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