When doing backup to disk, EMC recommends, if using Clariion, to use
Raid 3 which is more suitable for the sequential type of access that a
filesysem used for backups will face.
Itzik 

-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of Michael Hurst
Sent: Wednesday, January 04, 2006 19:07
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] How many RAID 5's should be used with DBO.

Hi All,

I am in the process of adding a new 16TB disk array (32 * 500GB SATA
drives) to our NetWorker Server.
I am going to split the array into 2TB chucks and implement Legato's
DBO.
I am using 2TB chucks because of the cost of licensing additional
devices.
I am going to configure the array disks into a RAID 5 solution.
Since we have limited funds there is no test environment for me to work
with.
Therefore, I am going live to production and was hoping someone could
share their experiences.

Is there any advantage to running one big 16TB (raw) RAID 5 or having
several RAID 5 groups (possible 1 per 2TB partition)?
I know there will be more space loss with the extra RAID groups but will
this be offset with other factors?

Also, the backup server is running on Solaris.
Is it advisable to reduce the number of inodes when running newfs?
The default seems to be over kill for the number of NetWorker backup
streams.

Thanks in advance.

Cheers,
Michael Hurst
University of Toronto
Computing and Networking Services
EMAIL michael.hurst AT utoronto DOT ca

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