no option for extended partition on sdb RAID5

Setting up Dell 2970 server (2 x AMD 6-core processors) with PERC 6i hardware RAID controller. Have two 135 GB drives set as RAID 1 = sda. Four 1 TB drives are set as RAID 5 = sdb. Installing openSuSE 13.1 from the LIVE DVD, there’s an option when configuring sda for a primary or an extended partition (I set two primarys for swap and / ). sdb reports a capacity of 2.7 TB. I want to make it an extended partition so I can use multiple logical partitions, one for /home and others for /home/userID where they would be encrypted logical partitions. However, the installer doesn’t offer the option for an extended partition on sdb. Is this a limitation of the disk size, >2 TB? Or the fact that it is RAID 5? Or some other reason? Can’t find a manual for PERC 6i on the Dell web site. Insights welcomed.

As a workaround I configured three partitions on sdb: /home/ and two /home/userID.

On 2014-01-01 23:26, konsultor wrote:
>
> sdb reports a
> capacity of 2.7 TB. I want to make it an extended partition so I can
> use multiple logical partitions, one for /home and others for
> /home/userID where they would be encrypted logical partitions. However,
> the installer doesn’t offer the option for an extended partition on sdb.
> Is this a limitation of the disk size, >2 TB? Or the fact that it is
> RAID 5?

The maximum classical (MBR) partition size is 2 TiB, meaning the extended partition size is 2 TiB.
All the logical partitions would fit inside, to a total of 2 TiB, because the primary partition
being the extended, the container, is limited to 2 TiB. The rest would have to go onto primary
partitions.

You should be using GPT partitions.

IF the installer is already choosing GPT partitions, which it should do automatically, then, of
course, there are no longer extended nor logical partitions, only primary are allowed. BUT, you have
at least 128 of them.


Cheers / Saludos,

Carlos E. R.
(from 13.1 x86_64 “Bottle” (Elessar))

Thankyou Carlos. that info settles my questions.