what is Netapp raid group and how its working..?

what is Netapp raid group and how its working..?

These are type of disks in filler


DISK TYPE
RAID-DP
RAID4
ATA/BSAS/SATA
                       Maximum
16
7
FC/SAS
                        Maximum
28
14
ATA/BSAS/SATA
                            Default
14
4
FC/SAS
                         Default
16
7
ATA/BSAS/SATA
                        Minimum
3
2
FC/SAS
                      Minimum
3
2


Only Example for RAID DP: 

> aggr creare aggr1 –t raid_dp –r 7 17
-t : for selecting raid type (raid4 or raid DP)
-r  : for select (how many disk want to be in one raid group)
17 meant for  :  17 disk for aggr1

Consider you are using SATA Disk with RAID DP,
In SATA Disk
16 disks is the maximum in one raid group,
7 disks is default in one raid group and
 3 Disks is Minimum to create NETAPP Raid group.
This is the recommended in Netapp.
After this command executed 3 raid groups will be created cause we mentioned ( –r 7 in command)so it will take 7 disk for one raid group(rg).

17 disk - 7 disk = 10 disk  -----> rg0
10 -7 = 3  -----> rg1
3- 3 = 0 -----> rg2 (here we having 3 balance disks its less than 7 disks, so it will calculate accordingly and create another raid group as rg2 with 3 disks, cause In RAID DP minimum is 3 disk )
Another example in RAID DP If balance disk is 3 disk means i will create another raid group that already i explained above, If suppose its  less than 3 disks remains means, two disk or one disk, That  balance disk will  moved to spare disks.


Only Example for RAID4 :

> aggr creare aggr1 –t raid4 –r 5 16
-t : for selecting raid type (raid4 or raid DP)
-r  : for select (how many disk want to be in one raid group)
16 meant for  :  16 disk for aggr1

Consider you are using SATA Disk with RAID 4,
In SATA Disk
16 disks is the maximum in one raid group,
4 disks is default in one raid group and
2 Disks is Minimum to create NETAPP Raid group.
This is the recommended in Netapp.

After this command executed 3 raid groups will be created cause we mentioned ( –r 5 in command)so it will take 5 disk for one raid group(rg).
16 disk - 5 disk = 11 disk  -----> rg0
11 -5 = 6  -----> rg1
6- 5 = 1 -----> rg2
Its  less than 5 disks, so that  balance 1 disk will  moved to spare disks.

So in this example aggr1 having 15 disk..

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