topic Hot spare on RAID-DP in ONTAP Discussions

Hot spare on RAID-DP

GLOBELEQ — Thu, 05 Jun 2025 05:33:36 GMT

Hi everyone,

I'm going to go straight into this. I have a FAS2240-2 and one of the controllers is owner of att eh 1TB SATA disks. Thats 24 in total. We currently have 1 aggregate spead across 2 RAID-DP groups. each RAID group is 11 disks. 2 parity + 9 data. This leaves 2 disk spare on the controller. One theoretically for each raid group.

Now the problem.

if I perform a "sysconfig -r" I see the 2 disks marked as spare. Great! If I look at disks in the GUI I also see the disks marked as spare. However, if I check the aggregate and click edit under disk details it only shows 1 spare.

WHY? images are below/attached.

Re: Hot spare on RAID-DP

radek_kubka — Thu, 26 Jun 2014 09:26:08 GMT

Okay, you definitely have 2 spares, there is no doubt about it.

I think the circled bit tells you, that the aggregate can be actually *expanded* by a 1 spare disk maximum, not 2, as you can't have a system without spares (well, in most cases )

Regards,
Radek

Re: Hot spare on RAID-DP

resqme914 — Thu, 26 Jun 2014 20:54:07 GMT

exactly.