topic Re: Hardware OS mirroring in BladeSystem - General

Hardware OS mirroring

dfox_wa — Mon, 22 Jun 2009 16:52:44 GMT

I have several ProLiant BL685c G1 blades that have two internal OS drives. The OS is Redhat release 4. I know that the internal drives are hardware mirrored. I am looking to see if there is anyway to break the mirror while the operating system is up and running and the second drive would be a bootable drive. Some software module or third party software, etc. I have been told so far by HP that is not possible. Is that correct?

Re: Hardware OS mirroring

JKytsi — Mon, 22 Jun 2009 17:06:11 GMT

I also have a feeling that must be done offline (breaking the RAID1 to 2 x RAID0 sets).

I don't know your goal with this, but why the drive is not bootable now if you take another out and put in to another server ?

Re: Hardware OS mirroring

dfox_wa — Mon, 22 Jun 2009 17:09:17 GMT

Not being bootable I am not sure of. At this point I have been told it is not. Of course as always it is worth a try.

Re: Hardware OS mirroring

JKytsi — Tue, 23 Jun 2009 05:24:02 GMT

If You are using HW RAID1 (Or RAID 1+0) with two disks, both drives will boot up and you can rebuild the raid with empty drive.

just be sure before yanking drive out that there is no disk I/O ongoing.

remember to assign points to answers given to YOU.

Re: Hardware OS mirroring

dfox_wa — Tue, 23 Jun 2009 13:26:56 GMT

Thanks,

What you said basically HP has backed up. Here is what they had to say

The only way to break the mirror in software is to used the built in RBSU utility built into the ROM of the server. To do this you must reboot the server and interrupt the boot to enter RBSU. RBSU cannot be accessed once the server is running an OS.

So basically no I/O.