topic Re: P400 migrating raid 0 to raid 1 in Disk Enclosures

P400 migrating raid 0 to raid 1

steve winick — Fri, 12 Feb 2010 19:50:35 GMT

i have a P400 with two drives, the first is array A and is raid 0. the second is unassigned and available. i am trying to mirror the 2 drives but i can't find any options in ACU for migrating from raid 0 to raid 1. how is this done?

is 512Meg BBWC necessary for this? i thought i had added BBWC when we first set up the machine, but i only see 256M in the cache properties. are there two versions of BBWC?

thanks to all

sjw

Re: P400 migrating raid 0 to raid 1

Patrick Terlisten — Sun, 14 Feb 2010 14:19:33 GMT

Hello,

yes, a BBWC is needed to do this online. The controller is delivered with cache, but not with a BBWC module. You can add only the BBWC module to you controller, or replace the 256 MB cache module with a 512 MB module and a BBWC module.

In your case it would be sufficient to add a BBWC to it.

HP SA-P400 and SA-E500 24 In Battery Cable Kit 417836-B21

Regards,
Patrick

Re: P400 migrating raid 0 to raid 1

steve winick — Sun, 14 Feb 2010 15:48:14 GMT

thanks for the prompt response. that's what i am trying to determine. i THOUGHT i already had the battery backup. here is the accelerator data from ACU:

Array Accelerator Present True
Cache Status OK
Array Accelerator (Cache) Ratio 25% Read / 75% Write
Total Cache Size 256 MB
Cache Backup Power Source Batteries
Battery/Capacitor Pack Count 1
Battery/Capacitor Status OK

it says i have 256 and that the battery is ok. should i be able to do the raid 0 -> raid 1 migration? or do i need to upgrade the cache to 512? i don't see the ACU choice ONLINE or OFFLINE?

should it be a single wizard selection or are there a series of steps?

thanks again

sjw

Re: P400 migrating raid 0 to raid 1

Patrick Terlisten — Sun, 14 Feb 2010 21:01:04 GMT

Hello,

you're right, you got a BBWC. So it should be possible.

You have to expand the array with the new physical disk. After the expansion of the array, you can migrate the logical drive from RAID 0 to RAID 1+0.

Regards,
Patrick

Re: P400 migrating raid 0 to raid 1

steve winick — Sun, 14 Feb 2010 22:21:03 GMT

ah. so you are saying it's two steps? first i expand the array with the new drive and then migrate? is it all the same wizard or two fully separate steps?

thanks again

sjw

Re: P400 migrating raid 0 to raid 1

Patrick Terlisten — Sun, 14 Feb 2010 22:37:07 GMT

Hello,

both tasks are managed by ACU. But two seperate tasks.

Regards,
Patrick

Re: P400 migrating raid 0 to raid 1

steve winick — Sun, 14 Feb 2010 22:56:42 GMT

thank you !

btw, is there any way to designate which array is bootable or is it alway the logical drive 1?

Re: P400 migrating raid 0 to raid 1

Patrick Terlisten — Mon, 15 Feb 2010 14:58:34 GMT

Hello,

AFAIK this is not configurable. SAs boot only from the first logical drive.

Regards,
Patrick

Re: P400 migrating raid 0 to raid 1

steve winick — Mon, 15 Feb 2010 15:02:50 GMT

thanks again