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..

If Any Question please feel free to ask...