what is aggregate NetApp cluster mode

what is aggregate NetApp Aggregates are the raw space in your storage system.  you take a bunch of individual disks and aggregate them together into aggregates.  But, an aggregate can’t actually hold data, its just raw space.  you then layer on partitions, which in NetApp land are called volumes.  the volumes hold the data.

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what is aggregate NetApp. You make aggregates for various reasons. 

For example:

performance boundaries – a disk can only be in one aggregate.  so each aggregate has its own discreet drives.  this lets us tune the performance of the aggregate by adding in however many spindles we need to achieve the type of performance we want.  This is kind of skewed by having Flash Cache cards and such, but its still roughly correct.

Shared Space boundary – All volumes in an aggregate share the hard drives in that aggregate.  there is no way to prevent the volumes in an aggregate from mixing their data on the same drives

Introduction to 32bit and 64bit aggregate Netapp

Aggregates are either 64-bit or 32-bit format. 64-bit aggregates have much larger size limits than 32-bit aggregates. 64-bit and 32-bit aggregates can coexist on the same storage system.

32-bit aggregates have a maximum size of 16 TB; 64-bit aggregates’ maximum size depends on the storage system model. For the maximum 64-bit aggregate size of your storage system model.

When you create a new aggregate, it is a 64-bit format aggregate.

You can expand 32-bit aggregates to 64-bit aggregates by increasing their size beyond 16 TB. 64-bit aggregates, including aggregates that were previously expanded, cannot be converted to 32-bit aggregates.

You can see whether an aggregate is a 32-bit aggregate or a 64-bit aggregate by using the aggr status command.

Creating Aggregate in Netapp Cluster mode

::> aggr create -aggregate AggrArk -diskcount 4 -disktype FCAL -node ArkIt-01
Aggregate creation cluster mode

Aggregate creation cluster mode

ArkCluster::> aggr show


Aggregate Size Available Used% State #Vols Nodes RAID Status
--------- -------- --------- ----- ------- ------ ---------------- ------------
aggr0 855MB 42.14MB 95% online 1 ArkCluster-01 raid_dp,
 normal

List out the aggregates using above command

ArkCluster::> aggr verify -aggregate aggr0 -action status

Aggregate:aggr0, Verify is not running

We can see the status of aggregate mirror status using above command. 

below is the command we can use it to do aggregate offline. In normal case Do not try in environment if your not sure.

ArkCluster::> aggr offline -aggregate aggr0

Warning: The aggregate contains one or more volumes. In order to offline the aggregate, all of these volumes must be unmounted. Do you want to unmount all of the volumes hosted by the aggregate? {y|n}: y

We can make aggregate online using below command

ArkCluster::> aggr online -aggregate aggr0

Aggregate space in detailed information using below example

ArkCluster::> aggr show-space

Aggregate : aggr0

Feature Used Used%
 -------------------------------- ---------- ------
 Volume Footprints 812.7MB 90%
 Aggregate Metadata 212KB 0%
 Snapshot Reserve 45MB 5%

Total Used 857.9MB 95%

Total Physical Used 347.8MB 39%

List number of disks in aggregate

ArkCluster::> aggr show-spare-disks -original-owner ArkCluster-01

Original Owner: ArkCluster-01
 Pool0
 Spare Pool

Usable Physical
 Disk Type RPM Checksum Size Size Status
 --------------------------- ----- ------ -------------- -------- -------- --------
 NET-1.18 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.19 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.20 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.21 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.22 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.23 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.24 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.25 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.26 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.27 FCAL 15000 block 1020MB 1.00GB zeroed
 NET-1.28 FCAL 15000 block 1020MB 1.00GB zeroed
11 entries were displayed.

Aggregate status with there raid group information and plex information. It will also show aggregate parity disk info.

ArkCluster::> aggr show-status

Owner Node: ArkCluster-01
 Aggregate: aggr0 (online, raid_dp) (block checksums)
 Plex: /aggr0/plex0 (online, normal, active, pool0)
 RAID Group /aggr0/plex0/rg0 (normal, block checksums)
 Usable Physical
 Position Disk Pool Type RPM Size Size Status
 -------- --------------------------- ---- ----- ------ -------- -------- ----------
 dparity NET-1.7 0 FCAL 15000 1020MB 1.00GB (normal)
 parity NET-1.8 0 FCAL 15000 1020MB 1.00GB (normal)
 data NET-1.17 0 FCAL 15000 1020MB 1.00GB (normal)
3 entries were displayed.

That’s it about what is aggregate netapp cluster mode.

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Thanks for your wonderful Support and Encouragement

Ankam Ravi Kumar

Working as Linux / Storage Administrator L3. Interested in sharing the knowledge.

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