topic Re: Root-data-data spare partitions in AFF

Root-data-data spare partitions

LORENZO_CONTI — Wed, 04 Jun 2025 11:14:20 GMT

Hello,

could someone please help clarify if that documentation applies to root-data-data partitioning?
Do I have to leave 2 different ssd with 2 spare partitions (root+data) for the HA pair?

Here's what i have on one of our AFF

cluster::> storage aggregate show-spare-disks Original Owner: cluster-01 Pool0 Root-Data1-Data2 Partitioned Spares Local Local Data Root Physical Disk Type Class RPM Checksum Usable Usable Size Status ---------------- ------ ----------- ------ -------------- -------- -------- -------- -------- 1.0.7 SSD solid-state - block 0B 37.42GB 3.49TB zeroed 1.0.19 SSD solid-state - block 1.73TB 0B 3.49TB zeroed Original Owner: cluster-02 Pool0 Root-Data1-Data2 Partitioned Spares Local Local Data Root Physical Disk Type Class RPM Checksum Usable Usable Size Status ---------------- ------ ----------- ------ -------------- -------- -------- -------- -------- 1.0.19 SSD solid-state - block 1.73TB 37.42GB 3.49TB zeroed 3 entries were displayed.

Thank you

Lorenzo

Re: Root-data-data spare partitions

TMACMD — Fri, 03 Apr 2020 15:50:23 GMT

If all your drives are RD2 (Root-Data-Data) partitioned, then they all show as "shared".

Technically speaking one drive on either controller can be used as a spare on both. Why?

If Any drive fails, it fails on both nodes. This causes a reconstruction on both nodes since the drive is partitioned between both. If there is a WHOLE (unpartitioned) drive, it is automatically partitioned to match what is there and reconstruction occurs on all three partitions (Root/Data/Data).

If you have a mix of RD2 and whole SSDs (unpartitioned), then you should leave at least one unpartitioned drive per controller.

Re: Root-data-data spare partitions

LORENZO_CONTI — Mon, 06 Apr 2020 12:47:09 GMT

Sorry,

maybe I have not explained very well...

In my example, do is better to align spare partitions in order to have all spares on 1.0.19? (of course better to have 2 full expensive spare drives) 🙂

Re: Root-data-data spare partitions

LORENZO_CONTI — Wed, 29 Jul 2020 15:05:10 GMT

It's now clear that the mentioned doc applies to root-data and not to root-data-data partitioning.

Thanks a lot