Expanding disk space in a RAID10 on R710

Dirk_List at Dell.com Dirk_List at Dell.com
Fri Apr 13 05:00:35 CDT 2012


Hi Brian,

# 1. Swap out each of the 4 drives, one at a time, with larger ones,
# then expand the RAID to fill the empty space.

In this scenario while rebuilding on an larger drive the controller will use the same disk space for the new "in-rebuild" drive as it uses before on the original one. So at the end you have the same volume size as before. But now you have free space on your drives where you could create an additional volume.

# 2. Get rid of the hot spare and use the 2 remaining slots to expand
# the RAID10 to 6 drives, and keep some cold spares on the shelf.

Will work but reconstruct could consume a lot of the disk performance. So keep in mind an reconstruct could affect your daily business.



-----Original Message-----
From: linux-poweredge-bounces-Lists On Behalf Of Brian Mathis
Sent: 11 April 2012 00:59
To: linux-poweredge-Lists
Subject: Expanding disk space in a RAID10 on R710

I need to expand the disk space on an R710 with a PERC6/i.  It is
currently configured with 4 drives in a RAID10 with 1 hot spare.  This
is with 450GB disks.  I see 2 options without going to external
storage:

1. Swap out each of the 4 drives, one at a time, with larger ones,
then expand the RAID to fill the empty space.


Has anyone performed either of these types of expansions?  The PERC6
docs mention that Online Capacity Expansion is not available for
RAID10, but does that apply for swapping drives for bigger ones, just
adding new drives, or both?  Would any of these be possible, even if
performed offline, without losing data?


❧ Brian Mathis

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