Software RAID on top of Hardware RAID


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# 1  
Bug Software RAID on top of Hardware RAID

Server Model: T5120 with 146G x4 disks.
OS: Solaris 10 - installed on c1t0d0.

Plan to use software raid (veritas volume mgr) on c1t2d0 disk.
After format and label the disk, still not able to detect using vxdiskadm.

Question:
Should I remove the hardware raid on c1t2d0 first?

My purpose using veritas volume manager is to ease of increase the disk size when it required. If to use hardware raid, once partition and disk is used on that partition, it will not that easy to expand size. Please correct me if my understand is wrong and do advice me for better approach.

Thank you.
# raidctl
Controller: 1
Volume:c1t0d0
Volume:c1t2d0
Disk: 0.0.0
Disk: 0.1.0
Disk: 0.2.0
Disk: 0.3.0

# raidctl -l c1t0d0
Volume Size Stripe Status Cache RAID
Sub Size Level
Disk
----------------------------------------------------------------
c1t0d0 136.6G N/A OPTIMAL OFF RAID1
0.0.0 136.6G GOOD
0.1.0 136.6G GOOD
# raidctl -l c1t2d0
Volume Size Stripe Status Cache RAID
Sub Size Level
Disk
----------------------------------------------------------------
c1t2d0 136.6G N/A OPTIMAL OFF RAID1
0.2.0 136.6G GOOD
0.3.0 136.6G GOOD
# 2  
I think that should work fine. If you're able to format and label it, you should be able to use it in veritas like any other disk, I'd think.

I'm guessing your problem isn't the hardware raid..

First, try:

Code:
vxdctl enable
vxdisk scandisks

Before you try vxdiskadm.

If you still don't see it, try initializing it manually:


Code:
vxdisksetup -i c1t2d0s2
vxdctl enable
vxdisk scandisks  
vxdisk list

You should see it online in vxdisk list, and should be able to go from there.
# 3  
Why dont you using SVM? You can expand the FS with growfs. VXvm is the powerfull VM, but in case of local rootdisk, easy to use SVM. The best solution for Solaris root disk is SVM, except ZFS. IMHO

Last edited by rua; 12-14-2011 at 06:02 AM.. Reason: add
# 4  
What not go the ZFS route instead? It gives you everything that Veritas Volume Manager or SVM provides and lots more.
# 5  
Hi All,
Thanks for all your reply. I decided to use back the hardware RAID without using software RAID.
At this moment, I'm just use ufs instead of SVM or ZFS; need further study on that before able to use.
Also, have no idea about ZFS route.

Anyway, thank you.
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