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Configuring RAID 1 for Sunfire V440

Posted on 2007-11-23
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We have got 4 internal hard disks in Sunfire V440, Trying to get RAID 1 on these using 'raidctl'

We have done mirroring for c1t0d0&c1t1d0 but when I add the next array :
raidctl -c c1t2d0 c1t3d0 , it is not allowing : Too many arrays.

Is there any way to get RAID 1 on these with internal RAID controller of Sunfire V440?

Thanks,
Vasanth.
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Question by:vasanth
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by:Brian Utterback
ID: 20348043
With the V440's SCSI controller, you cannot have more than two disks in a single RAID 1 volume. However, you say that you are using
Solaris 10 1/06. If you upgrade to the latest update, instead of using the hardware RAID 0, you can specify a ZFS volume and do just
as well or better. I don't know exactly what you are trying to accomplish, so I can't help you with the configuration directly, but in general
ZFS is the way to go once you are running Solaris 10.
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by:vasanth
ID: 20348362
I want to mirror c1t0d0&c1t1d0 and c1t2d0&c1t3d0,
ZFS is new to me..let me know if we can achieve this on Sunfire V440.

Thanks,
Vasanth.
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LVL 22

Expert Comment

by:Brian Utterback
ID: 20349544
Sorry, I am still not sure what you want to do.

Do you want to have two separate volumes, each with two mirrored disks?
Or do you want a single large volume, made up of two mirrored sets, each
mirror with two disks?

The former you can do with raidctl, the latter will require ZFS. However, in
your position, I would use ZFS to create the former as well. ZFS is very simple to
use.
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by:vasanth
ID: 20349690

I want to have two separate volmes, how do I do with raidctl..?
Also with ZFS?
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Brian Utterback earned 225 total points
ID: 20352370
I did some research and apparently the raid controller on that box will only
configure a single mirrored volume. However, you can easily use do what you
want using either both the raid controller and ZFS or ZFS alone.

If you want the hybrid, just use the first mirrored volume as you already have,
and then do this:

zpool create zp mirror c1t2d0 mirror c1t3d0

The above creates the mirrored volume. You can then use the zfs command to create filesystems on it.

zfs create zp/home
zfs set mountpoint=/export/home zp/home

The first creates the file system and the second tells the system to where to mount it.

Instead of using the hardware raidctl command, you could do the same thing to create one large mirrored
volume:

zpool create zp mirror c1t0d0 c1t1d0 mirror  c1t2d0 c1t3d0

This will create a single pool with two stripped disk sets acting as mirrors.

You could go the RAID-Z approach and do this:

zpool create zp raidz2 c1t0d0 c1t1d0  c1t2d0 c1t3d0

This will create a single large pool with double parity protection.
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