ONTAP Hardware

Creating aggregates with disks from DS2246 and DS224C shelves

TAO1
364 Views

Hi,

 

I will have a HA pair that has a stack of DS224C shelves and a separate stack with DS2246 shelves - the disks are the same size/speed. The load on the cluster isn't anywhere near pushing 6Gbps. Is it permittable to mix disks from the different shelves within the same aggregate?

 

I guess it isn't a good idea due to potentially different EOS dates, but is there a technical reason?

 

Thanks,

 

Ty

1 ACCEPTED SOLUTION

maffo
310 Views

DSS246 and DS224C are, in fact, different shelves so that article applies. ONTAP doesn't really care about the physical location of the disk when creating an aggregate but will look at disk type and speed (e.g. all SAS 10k RPMs in one aggregate, all SAS 15k RPMs in a different aggregate).

The limitation/pitfall here, as you mentioned previously, is that the connection to some disks will only be half the speed (6Gb/s vs 12Gb/s); from your own statement however, this should not be a problem since the system is not loaded anywhere enough to saturate 6Gb/s.

 

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7 REPLIES 7

paul_stejskal
358 Views

There are limited transitions between 6/12 Gb/s cabling permitted. You didn't say your platform but this will generally be available on Hardware Universe (hwu.netapp.com check for your AFF/FAS platform) and there are KBs on the topic. https://kb.netapp.com/Special:Search?qid=&fpid=230&fpth=&query=mixing+shelves&type=wiki should give you a KB matching your system.

 

maffo
323 Views

hi @TAO1 

yes you can mix disks from a DS224C and DS2246 in the same aggregate, as long as the disks are the same type (HDD vs SSD) and - for HDD - share the same speed.

TAO1
319 Views

Thanks for the replies.

 

@maffo, is there supporting documentation to suggest that you can mix disks from a DS224C and DS2246 in the same aggregate please?

 

TAO1
314 Views

Thanks @maffo , but the doc doesn't specify mixing shelves with a 6Gbps and 12Gbps backplane. Is there anything that covers this, along with perhaps the pitfalls please?

maffo
311 Views

DSS246 and DS224C are, in fact, different shelves so that article applies. ONTAP doesn't really care about the physical location of the disk when creating an aggregate but will look at disk type and speed (e.g. all SAS 10k RPMs in one aggregate, all SAS 15k RPMs in a different aggregate).

The limitation/pitfall here, as you mentioned previously, is that the connection to some disks will only be half the speed (6Gb/s vs 12Gb/s); from your own statement however, this should not be a problem since the system is not loaded anywhere enough to saturate 6Gb/s.

 

TAO1
306 Views

Thanks @maffo 

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