Move raid10 from LSI 9750-8i to 3ware 9650SE-8LPML

3warebbulsimigration

This is a little risky task I want to try.
I have a 4 SATA III disks RAID10 array running on LSI (former 3ware) 9750-8i controller
with BBU (read and write cache enabled). In case of hardware failure I would like to move the array to older 3ware
controller, model 9650SE-8LPML without BBU.

Configuration of that array is:

/c2/u0 status = OK
/c2/u0 is not rebuilding, its current state is OK
/c2/u0 is not verifying, its current state is OK
/c2/u0 is initialized.
/c2/u0 Write Cache = on
/c2/u0 Read Cache = Intelligent
/c2/u0 volume(s) = 1
/c2/u0 name = mons                 
/c2/u0 serial number = S1DGCBEB159EED0051BF 
/c2/u0 Ignore ECC policy = off       
/c2/u0 Auto Verify Policy = on        
/c2/u0 Storsave Policy = balance     
/c2/u0 Command Queuing Policy = on        
/c2/u0 Rapid RAID Recovery setting = all
  1. Is this at all possible?
  2. Is the lack of BBU in the older controller will not cause failure?
  3. In such a case (no BBU), only the read and write cache stops working?

Best Answer

I tested this a long while ago when we upgraded from 9650SE/9690SA to 9750-4i and 9750-8i: - moving RAID arrays created on 9650 to 9750 works fine - moving RAID arrays created on 9750 to 9650 works fine - moving a degraded array from 9750 to 9650 works fine - moving a degraded array from 9750 to 9650 in the middle of a rebuild just continues rebuilding on the 9650

Conclusion: 9650 and 9750 are compatible in both ways. Only difference is the required drivers.

I tested using 6x Seagate 7200.11 500GB and RAID6. Other RAID levels could give different results, but I think that if RAID6 works, you should be fine on other RAID levels too.

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