How to make an aggregate in Netapp storage 7-Mode

1. 1. Storage provisioning procedures and standards
Aggregate Standards
Aggregate Management isdone duringthe initial setupand installationor at the time when
somethinggetsfull and there is no space available.Storage team will decide the configurationof the
new aggregate.Anytime a newaggregate is createdbelowstandards will be usedfor naming
conventions
Naming convention:aggr0, aggr1…
Example:
Aggr create aggr1 –t raidDP 24@300g
Aggregate Management
Creatingan aggregate by usingCLI or Netappsystem manager(GUI)
 Opennetapp systemmanager
 SelectAggregates Add
 Aggregate Name: aggrX “X stands for nextavailable digit”
Double Parity (Raid Dp): Selectthis for all aggregatesas a standard
Note:create Aggr name as perthe naming convention
 RAID GroupSize:16 or 28
this is Generally16 for SATA/ATA or 28 for FC, but also dependsonthe no of total drives
available.
 Disk Selection:Automaticor manual (chose automatic for disk selection)
 Disk Size:Choose appropriate Size
 In all filersAggr0 is created with FCdisks and aggr1 is created with SATA disks.
Creating an aggregateby using command line,
Aggr create aggr_name –t raid type [ndisk@ size of disk]
Example:
Aggr create aggr1 –t raidDP 24@300g

2. Considerationsfor sizing RAID groups for disks
Configuringan optimum RAID group size for an aggregate made up of disks requiresa trade-offof
Factors. You must decide which factor—
Speedof recovery,assurance against data loss,or
Maximizingdata storage space—ismost important for the aggregate that you are configuring.
You change the size of RAID groups on a per-aggregate basis. Youcannot change the size of an
Individual RAID group.
HDDs-:
You should follow these guidelines when sizing your RAID groups for HDD disks:
• All RAID groups in an aggregate should have the same number of disks.
If this is impossible, any RAID group with fewer disks should have only one less disk than the
Largest RAID group.
• The recommended range of RAID group size is between 12 and 20.
The reliability of SAS and FC disks can support a RAID group size of up to 28 if needed.
• If you can satisfy the first two guidelines with multiple RAID group sizes, you should choose the
Larger size.
In most cases, the default RAID group size is the best size for your RAID groups. However, you can
change the maximum size of your RAID groups.
Large RAID group configurations offer the following advantages:
 More data drives available. An aggregate configured into a few large RAID groups requires
fewer drives reserved for parity than that same aggregate configured into many small RAID
groups.
 Small improvementinstorage systemperformance.Write operationsare generallyfasterwith
larger RAID groups than with smaller RAID groups.
Small RAID group configurations offer the following advantages:
 Shorter disk reconstruction times. In case of disk failure within a small RAID group, data
reconstruction time is usually shorter than it would be within a large RAID group.

3.  Decreasedrisk of data lossdue to multiple diskfailures.The probability ofdata loss through
double-diskfailure withinaRAID4 group or through triple-diskfailure withina RAID-DP group
is lowerwithina small RAID group than withina large RAID group
Maximumand defaultRAID group sizes
Maximumand defaultRAID group sizesvary according to the storage system model,level ofRAID
group protectionprovided,and the types of disksusedin the RAID group. The defaultRAID group
sizesare generallyrecommended.
Table 1. RAID group sizing for RAID-DP groups
Disk type Minimumgroup size Maximumgroup size Defaultgroup size
ATA or SATA 3 16 14
FC or SAS 3 28 16