How to RAID1+0 with Solaris 9 SVM

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From: Mohamed Lrhazi <mohamed@your-site.com>
To: sunmanagers@sunmanagers.org
Date: Fri, 18 Apr 2003 15:03:21 -0400

Hello all,

The docs say that it is possible to configure RAID1+0, but no example of
how to configure is given.
Please let me know if this is correct:

I have two A5000, each has 14 disks, each disk has one big partition.
I created a database replicat, of default size, on each partition, on
all disks.
So, all my slices/partitions are exactly same size.

I first tried building 14 mirrors, each made up of two partitions, one
from each A5000. then I tried to make a stripe made of all the 14
mirrors... SVM said, no no, cannot build stripe out of metadevices!

So, I undid all metadevices and built it this way:
build a stripe with all partitions of one A5000, then a second stripe
with all partitions of the other.
build a two way mirror, using the two stripes...

Now this works, SVM does not complain, but:
-Is this really a RAID1+0?
- Aprat from unplugging disks here and there, is there a way to confirm
this IS is RAID1+0?

Thanks, I will summerize.
Mohamed~

  From docs.sun.com,

Solaris 9 12/02 System Administrator Collection >> Solaris Volume
Manager Administration Guide >> 9. RAID 1 (Mirror) Volumes (Overview)

     Providing RAID 1+0 and RAID 0+1

Solaris Volume Manager supports both RAID 1+0 (which is like having
mirrors that are then striped) and RAID 0+1 (stripes that are then
mirrored) redundancy, depending on the context. The Solaris Volume
Manager interface makes it appear that all RAID 1 devices are strictly
RAID 0+1, but Solaris Volume Manager recognizes the underlying
components and mirrors each individually, when possible.

------------------------------------------------------------------------
Note -

Solaris Volume Manager cannot always provide RAID 1+0 functionality.
However, in a best practices environment, where both submirrors are
identical to each other and are made up of disk slices (and not soft
partitions), RAID 1+0 will be possible.

------------------------------------------------------------------------
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