NetApp Raid
RAID-Redundant Array Of Independent Disks
In all the Raid in NetApp having minimum data disk and minimum parity disk
Disk Types
Data : Holds data stored within the RAID group
Spare : Does not hold usable data but is available to be added to a RAID group in an aggregate,
Disk Types
Data : Holds data stored within the RAID group
Spare : Does not hold usable data but is available to be added to a RAID group in an aggregate,
also known as a hot spare
Parity : Store data reconstruction information within the RAID group
dParity : Stores double-parity information within the RAID group, if RAID-DP is enabled
These are type of disks in filler
Parity : Store data reconstruction information within the RAID group
dParity : Stores double-parity information within the RAID group, if RAID-DP is enabled
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
|
In Netapp two raid supported
Raid 4
Raid 4
- It will protect against the loss of just one disk per raid group.
- RAID 4 will not "protect against multiple disk failures"
- If suppose some disk failed in different raid group, there won't be any data loss.
In Raid 4 Required minimum 2 disks required to create one aggregate
One disk for data disk
One disk for parity disk
RAID 4
Example:
filer>Aggr create -r 5 -t raid4 aggr1 10
aggr1 will randomly take 10 disk from spare disk and -r 5 which means each raid group should have 5 disks
aggr1 will randomly take 10 disk from spare disk and -r 5 which means each raid group should have 5 disks
it will create two raid group and each raid group have 5 disks.
RAID-DP
RAID-DP (Double Parity)
Raid DP is a Double Parity disk and this implementation that prevents data loss when two disk fail.
In Raid DP minimum 3 disks required to create one aggregate.
It will support multi disk failure.
In NetApp raid DP is default raid group.
It will support multi disk failure.
In NetApp raid DP is default raid group.
Example:
filer1> aggr create -r 5 aggr1 10
In this command "aggr create -r 5 aggr1 10"aggr1 will randomly take 10 disk from spare disk and -r 5 which means each raid group should have 5 disks.So obviously here two raid group will create and each raid group should have 5 disks.
d1 d2 d3 P(d4) DP (d5) => rg0
d6 d7 d8 P(d 9) DP (d10) => rg1
Note:
d1 - d10 which means disk name
P for parity disk
DP for second parity disk
rg0 and rg1 are raid group 0 and 1
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