topic Minimum Hot Spare Count? in AFF

Minimum Hot Spare Count?

jae85 — Wed, 04 Jun 2025 12:26:05 GMT

Hi,

We have 24 SSD's in our AFF-A200. We wanted to use one hot spare while we were configuring the aggregate, but we could not set it to less than two. Of course, having a sufficient amount of hot spare is always the best practice. However, since each disk has relative a large capacity, we also need to compromise on the efficiency of the capacity so we could have more usable capacity. I wonder if it's possible to have only one hot spare.

Re: Minimum Hot Spare Count?

SpindleNinja — Wed, 26 Jun 2019 17:27:41 GMT

On the A200, you'll have 1 "physical" disk used as a spare. But due to RD2 (root-data-data) partitioning, the spare partitions will be spread out throughout the filer.

Re: Minimum Hot Spare Count?

jae85 — Wed, 26 Jun 2019 17:35:02 GMT

So, I assume that it is possible to have a hot spare disk. Currently, we have 2 physical disks are used as hot spares. Can I assign one of them into the data partition?

Re: Minimum Hot Spare Count?

SpindleNinja — Wed, 26 Jun 2019 17:55:43 GMT

can you post the output of "storage aggregate show-spare-disks"

Re: Minimum Hot Spare Count?

jae85 — Wed, 26 Jun 2019 18:02:55 GMT

::> storage aggregate show-spare-disks

Original Owner: sjsfiler_1
Pool0
Spare Pool

Usable Physical
Disk Type Class RPM Checksum Size Size Sta tus
---------------- ------ ----------- ------ -------------- -------- -------- --- -----
1.0.23 SSD solid-state - block 3.49TB 3.49TB zer oed

Original Owner: sjsfiler_1
Pool0
Root-Data1-Data2 Partitioned Spares
Local Local
Data Root Phy sical
Disk Type Class RPM Checksum Usable Usable Size Status
---------------- ------ ----------- ------ -------------- -------- -------- --- ----- --------
1.0.18 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.19 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.20 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.21 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.22 SSD solid-state - block 0B 143.7GB 3.49TB zeroed

Original Owner: sjsfiler_2
Pool0
Spare Pool

Usable Physical
Disk Type Class RPM Checksum Size Size Status
---------------- ------ ----------- ------ -------------- -------- -------- --------
1.0.17 SSD solid-state - block 3.49TB 3.49TB zeroed

Original Owner: sjsfiler_2
Pool0
Root-Data1-Data2 Partitioned Spares
Local Local
Data Root Physical
Disk Type Class RPM Checksum Usable Usable Size Status
---------------- ------ ----------- ------ -------------- -------- -------- -------- --------
1.0.12 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.13 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.14 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.15 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
1.0.16 SSD solid-state - block 0B 143.7GB 3.49TB zeroed
12 entries were displayed.

Thanks!

Re: Minimum Hot Spare Count?

SpindleNinja — Wed, 26 Jun 2019 18:20:29 GMT

can you also post the following output "storage disk show -partition-ownership"

Re: Minimum Hot Spare Count?

SpindleNinja — Wed, 26 Jun 2019 19:49:14 GMT

not sure what happened to the other comment you made, but it looks like you have 2 disks that are owned and "whole" and not partitioned, at most you should only have one i believe if a disk should ever fail. what happens if you try and grow an aggr?

See the attached image, it'll show visually how an AFF with 1 shelf of disks should look.