5 Replies Latest reply: Oct 29, 2013 4:34 AM by KHAN.FAISAL RSS

RAID Group Size with disk expansion

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I have a FAS3210A with each head owning a DS4243 shelf of 1 TB SATA drives.  Current RAID group size is 16.  There are only 18 disk populated in each shelf (6 empty bays).  2 disks are hot spares for each shelf.  Here's my question.  I have 6 disks to add to each shelf, which will max out the shelf with 24 drives.  Do I expand the RAID group size or keep it the same.  If I keep it at 16, then I'm only going to get to use 4 out of the 6 drives, b/c it will create new parity drives.  If I expand the RAID group size, will this affect performance?  How badly will performance be affected?  Also, what is the maximum RAID group size for a 3210 with 1 TB SATA drives.  We're currently running ONTAP 7.3.5P1 on this cluster, with the idea of upgrading to 8.1.3P2 in the near future.


Thanks in advance for any info!

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