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ONTAP Discussions

SPARES_LOW on AFF-A250

PeterMekes

Hi,

 

Is the AFF-A250 an capacity-optimized system and can I safely change the  "raid.min_spare_count" to  0 ?

Customer is getting every week a SPARES_LOW  warning.

 

 

1 ACCEPTED SOLUTION

CHRISMAKI

Hi PeterMekes,

 

I just confirmed in Fusion that the partitioning you described is as expected from ADP R-D-D. Because of this, you should be able to adjust MIN_SPARES to 0, I didn't have access to an 8 drive system, so I was unable. As you can see in the error message from my previous reply was that setting it to 0 on systems with more than 16 drives isn't supported, but you are well under that threshold. 

View solution in original post

4 REPLIES 4

CHRISMAKI

I believe setting that value to 0 would eliminate the SPARES_LOW warning, but the real question here should be "should I have zero hot spares available?", to which my answer would be no...Now if you have cold spares on site, that would make me less nervous, but I'd much rather see a hot spare be available.

 

EDIT: Just tried this and go the following:

 

option raid.min_spare_count: Cannot be set to 0 if there are more than 16 drives or any RAID4 groups configured.

PeterMekes

Hi Chrismaki,

 

The system has 8 disk and partioned  with root-data-data. They are provisioned into aggregates such that each controller uses 7 data partitions for filesystem data, and one data partition remains as a spare. (Recommended  during installation)

So there are no spare disk only a spare partition per controller.

 

CHRISMAKI

Hi PeterMekes,

 

I just confirmed in Fusion that the partitioning you described is as expected from ADP R-D-D. Because of this, you should be able to adjust MIN_SPARES to 0, I didn't have access to an 8 drive system, so I was unable. As you can see in the error message from my previous reply was that setting it to 0 on systems with more than 16 drives isn't supported, but you are well under that threshold. 

View solution in original post

PeterMekes

Hi Chrismaki,

 

Thanks, I shall adjust the setting to 0.

 

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