[lustre-discuss] OST partition sizes

Patrick Farrell paf at cray.com
Tue Apr 28 13:31:10 PDT 2015

Excuse me, sorry - I meant to say 8+2, like Rick said.  Don't know where my head is at.
From: Mohr Jr, Richard Frank (Rick Mohr) [rmohr at utk.edu]
Sent: Tuesday, April 28, 2015 3:27 PM
To: Patrick Farrell
Cc: Andrus, Brian Contractor; lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] OST partition sizes

> On Apr 28, 2015, at 4:05 PM, Patrick Farrell <paf at cray.com> wrote:
> For ldiskfs OSTs, I believe the most common configuration is RAID 6 with 8 disks (6+2 parity) with whatever disk size you're using.

Actually, it is probably more like 8+2 RAID6 with 128 KB chunk size (so that a 1 MB I/O request fits nicely across 1 RAID stripe)

Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences

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