Can't add more disks to aggr0

MASTERHINZ — Thu, 05 Jun 2025 05:42:41 GMT

Hi everyone,

i have a problem adding more disks to one aggregate.

It's a FAS2240 with 2 Controllers. Ontap 8.1.3

storage1office> sysconfig -r

Aggregate aggr0 (online, raid_dp) (block checksums)

Plex /aggr0/plex0 (online, normal, active, pool0)

RAID group /aggr0/plex0/rg0 (normal, block checksums)

RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)

--------- ------ ------------- ---- ---- ---- ----- -------------- --------------

dparity 0a.00.0 0a 0 0 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

parity 0a.00.2 0a 0 2 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.4 0a 0 4 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.6 0a 0 6 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.8 0a 0 8 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.10 0a 0 10 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.12 0a 0 12 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.14 0a 0 14 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.16 0a 0 16 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.18 0a 0 18 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0a.00.20 0a 0 20 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

data 0b.00.7 0b 0 7 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

data 0b.00.9 0b 0 9 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

data 0b.00.11 0b 0 11 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

data 0b.00.13 0b 0 13 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

data 0b.00.15 0b 0 15 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

Pool1 spare disks (empty)

Pool0 spare disks

RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)

--------- ------ ------------- ---- ---- ---- ----- -------------- --------------

Spare disks for block checksum

spare 0a.00.22 0a 0 22 SA:A 0 SAS 10000 560000/1146880000 572325/1172123568

spare 0b.00.17 0b 0 17 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

spare 0b.00.19 0b 0 19 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

spare 0b.00.21 0b 0 21 SA:B 0 SAS 10000 560000/1146880000 572325/1172123568

Partner disks

RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)

--------- ------ ------------- ---- ---- ---- ----- -------------- --------------

partner 0b.00.23 0b 0 23 SA:B 0 SAS 10000 0/0 572325/1172123568

partner 0b.00.5 0b 0 5 SA:B 0 SAS 10000 0/0 572325/1172123568

partner 0b.00.3 0b 0 3 SA:B 0 SAS 10000 0/0 572325/1172123568

partner 0b.00.1 0b 0 1 SA:B 0 SAS 10000 0/0 572325/1172123568

When i try to add the "pool0 spare disks" with >aggr add aggr0 -d 0b.00.22 for example, like i did with the others i get following output:

storage1office> aggr add aggr0 -d 0b.00.22

aggr add: Starting a new raid_dp RAID group;

The number of disks specified must be at least three

times the number of plexes in the target aggregate 'aggr0'.

storage1office> Tue Feb 18 15:33:38 CET [storage1office:asup.post.drop:error]: AutoSupport message (HA Group Notification from storage1office (SHELF POWER INTERRUPTED) WARNING) for host (0) was not posted to NetApp. The system will drop the message.

It looks for me like it wants to create a new aggr instead of adding the disk to the existing aggr0... i cant explain why.

Hope someone can help me

Best regards from germany,

mhinz

Re: Can't add more disks to aggr0

aborzenkov — Tue, 18 Feb 2014 14:39:11 GMT

It tries to create new raid group, not aggregate. You can increase raid group size beyond default 16 disks (aggr options but forgot option name )

Re: Can't add more disks to aggr0

resqme914 — Tue, 18 Feb 2014 14:39:50 GMT

I don't know how many disks you want to add to aggr0, nor what the rg size is, but if you want to add one disk (as you showed in your example) to the existing raid group then specify the raid group you want to add it to (assuming there's room) with the switch "-g rg0", for example: "aggr add aggr0 -g rg0 -d 0a.00.22". If you want to add more than one disk, just specify the additional disk names after the first disk name (separated by a blank space).

"aggr status -v aggr0" will show you the raid group (most likely it's rg0) and the raid size (probably 16). If you need to increase the raid size to accomodate additional disks, then use "aggr options aggr0 raidsize n" (where n is the new raidsize number). Be careful and know for certain what you are doing: you can increase the raidsize, but you cannot decrease it.

Re: Can't add more disks to aggr0

nigelg1965 — Tue, 18 Feb 2014 14:43:14 GMT

It wants to create a new RAID group, change the RAID group size to something bigger up to 28 is valid for SAS disks, 16 is the default.

Re: Can't add more disks to aggr0

MASTERHINZ — Tue, 18 Feb 2014 14:52:20 GMT

Thanks for your instructions! now it works

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Can't add more disks to aggr0

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