P400 Controller - RAID 1 option?, only has RAID 1+0?

[jamhp1]

Dear all,

I'm a little confused with the P400 controller card on our new DL380 G5 server. We have 2 72GB SAS disks in the server connected via the P400 card.

We wish to have these disks mirrored (RAID 1). But that option does not seem to exist in the configuration for the P400 card, only RAID 0, RAID 1+0 and RAID 5 are listed.

Is this normal? Should we just select RAID 1+0 for the 2 disks, to create one logical volume?

On doing this we see the available disk size drops from ~72GB to ~68GB, is this correct?

Thanks for your help!
James.

[Uwe Zessin]

The SmartArray controller terminology is a bit strange, sometimes ;-)

It calls a two-disk RAID-1, RAID 1+0 and it calls a JBOD (single disk drive encapsulation), RAID-0.

So, yes, this is 'normal'. You just build a disk drive array with two physical disk drives and create one or more logical disks with RAID 1+0 in it.

> disk size drops from ~72GB to ~68GB

Hm, to me, this looks like the software switches from showing Hardware GigaBytes to Software GigaBytes for some reason - I don't think the meta data area requires 4 GigaBytes:

72.8/1.024/1.024/1.024 = 67.80028