I have P410i+256M Cache without battery backup. My RAID5 was build over 3*136GB disks, now all disks were replaced to a 3*300GB array.

How can I extend it to use the whole space?

HPacucli doesn't allows that, I think this might be because no battery is present.

I have a redundant power supply. All data is mirrored over DRBD to a secondary server, so I can try to resize with a chance of loss of data in case of power failure, but I prefer to have an online resize.

1 Answer 1


You do not have an online option. Online array/logical drive expansion with Smart Array controllers is only available with a battery or flash-backed cache unit. The online features leverage the cache unit heavily during online operations.

See the Smart Array P410 Quickspecs.

Management Features 
Online array expansion (with BBWC/FBWC upgrade)
Online Advanced Capacity Expansion (with BBWC/FBWC and Smart Array Advanced Pack upgrade)
Online logical drive extension (with BBWC/FBWC upgrade)
Online RAID level migration (with BBWC/FBWC upgrade)
Online strip size migration (with BBWC/FBWC upgrade)

In general, it's a good idea to have a BBWC/FBWC unit for HP RAID controllers. It'll certainly improve the write performance on your RAID5 array. See this advisory. Look for HP parts #534916-B21 or #462969-B21.

In order to initiate the expansion of your existing array offline, you can download the HP SmartStart CD image (or use the one that came with the server) and boot into the Array Configuration Utility (ACU) to make the appropriate changes to your array. Follow the array expansion instructions listed in the ACU manual.

  • 1
    OK, how i can extend it at all, without battery? I have no option right now to get battery :( Mar 28, 2012 at 12:34
  • also, since i have additional DRBD replication, i'm just enabled write cache without battery. Mar 28, 2012 at 12:35
  • See my comment above. I'd still recommend trying to find a battery, used or otherwise.
    – ewwhite
    Mar 28, 2012 at 12:42
  • i have checked guide one more time, and still see no way to do that expansion in offline :( it still require battery.. Mar 28, 2012 at 15:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.