From: "Jeffrey Jasper" <jjasper@(email surpressed)>
Subject: Re: configuring Promise VTrak as a Mac OS X renderfarm volume - tips
   Date: Thu, 21 Apr 2011 18:50:55 -0400
Msg# 2097
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Ours are actually 2x 16 bay RAID6 for main storage and 2x 16bay RAID5 for backup storage boxes all run off one Xserve. I have an rsync script that copies from the RAID6 units to the RAID5 units. No issues with speed, our storage boxes are dual channel eSAS. The reason I don't mirror my backups is I have had issues of corruption getting mirrored in the past where the rsync will skip over the corruption and log it. With our RAID controller there is no real penalty for doing RAID6 over RAID5 so I like the extra security of being able to have two drives fail. I also have a RAID1 unit that a pair of raw drive goes in for individual project backup for offsite storage.

I will trade data integrity for speed any day as long as the speed does not affect work.



On Sun, 17 Apr 2011 21:49:45 -0700, Pascal Grosvenor <Pascal.Grosvenor@(email surpressed).au> wrote:

Hello,

I'm setting up a new Promise VTrak Raid for a new renderfarm i'm building (it's got 16 x 2 TB drives). It will be connected directly to an Apple Xserve. Does anyone have any tips or suggestions for how to configure it ?

Given the nature of rendering (having lots of clients writing individual rendered frames back to the RAID) i reason that high write speed is probably the most important feature in choosing a RAID level.

I'm thinking 0+1 would give the highest write performance but then i only get 50% effective disk space. I'm thinking there's probably something in between 0+1 and RAID 5 that could be suitable ... That would give more disk space than 0 + 1 and better performance than 5.

Would love to hear other people's thoughts and experiences.

kind regards
Pascal


----
Pascal Grosvenor
Faculty Computing Unit,
Design, Architecture & Building
University of Technology, Sydney
ph   9514 8944


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