RAID controller features
Patrick_Boyd at Dell.com
Patrick_Boyd at Dell.com
Wed Mar 3 14:17:51 CST 2010
I'll comment on some of this.
1) I don't have any information on this.
2) I know they work on PERC 6, SAS 6, PERC H700, PERC H800, and PERC H200. I'm not positive about others. They don't work as a boot volume without a UEFI BIOS. (PowerEdge RX1X, PowerEdge TX1X, or PowerEdge MX1X have this as an option)
3) This works for non-spanned RAID Levels (i.e. 0, 1, 5, and 6). You also are restricted to using the same RAID level per disk group. So multiple RAID 5's per a disk group, not a RAID 5 and a RAID 6 on the same disk group.
4) Not supported.
From: linux-poweredge-bounces-Lists On Behalf Of Dominic Lepiane
Sent: Wednesday, March 03, 2010 1:47 PM
Subject: RAID controller features
We've got a bunch of different PowerEdge servers running various
operating systems, and recently I've been banging my head against the
wall with make some changes to the various RAIDs.
What do you guys have for feedback on what features are available from
what RAID controllers?
For example, I have a PE2900 with a PERC 5/i. It's got a RAID1 for OS
plus a RAID5 for data. I tried growing the data RAID by upgrading the
disk sizes only to find that after much fiddling and searching Online
that some people report the upgrade "just works" and others say "it just
doesn't". So fine, I've blown away the data RAID and built it anew by
hand only silly me, I started off with a similar amount of storage first
(fewer but larger drives) so then I had to expand the array by adding
another disk. Now this worked in that the array grew and OM now shows
"2,793.00GB" but the OS (CentOS 5.4 x64) does not, it shows 1.999TB:
[root at host ~]# parted /dev/sdb p
Model: DELL PERC 5/i (scsi)
Disk /dev/sdb: 1999GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 17.4kB 1999GB 1999GB
Now on another server, an R710 with a PERC 6/i, I figured rather than
get burned by a 2TB limit, I would cleverly in the RAID BIOS put
together the RAID with multiple (sub-2TB) Virtual Disks. That didn't
work in the RAID BIOS and when I called Dell support thinking maybe this
was a bug with the BIOS or some odd hardware fault, support said that
multiple VDs on a single array wasn't "supported" though once we loaded
an OS (Windows Server 2008) on there with OM, that was exactly the
configuration we were able to do (two VDs on one array).
So I guess I'd like to know if Dell offers any products that have the
following features and under what configurations they work:
1) Array expansion by replacing smaller disks with larger ones
2) Arrays over 2TB in size
3) Carving of arrays into multiple VDs (or auto-carving any arrays into
2TB and smaller VDs)
4) More sophisticated operations like dropping disks from arrays where
not all array space is used by VDs
I'd definitely like to know about internal storage like PERC or those
H200/H700 (I haven't used any of these yet), but I'd also like to hear
your feedback on direct attached (MD1000 etc) or SAN (Equilogic? )
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