IBM N series Hardware Manual page 212
System storage
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- Hardware manual (362 pages) ,
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Table 14-2 Right-sized disk capacities
Disk Type
FC/SAS/SSD
SATA
or
OEM array LUNs
with a Gateway
MSATA
or
OEM array LUNs
with a Gateway
Note: Although an aggregate can contain disks of both checksum types, separate RAID
groups are created for each type. Disks of a different checksum type cannot be used to
replace a failed disk. You cannot change the checksum type of a disk. For mirrored
aggregates, both plexes must have the same checksum type.
Effect of the aggregate
When the disks are added to an aggregate, they are automatically assigned to RAID groups.
Although this process can be tuned manually, there is no separate step to create RAID
groups within the N series platform.
The aggregate might impose some capacity overhead, depending on the following DOT
version:
DOT 8.1
In the latest version on ONTAP, the default aggregate snapshot reserve is 0% Do not
change this setting unless you are using a MetroCluster or SyncMirror configuration. In
those cases, change it to 5%.
192
IBM System Storage N series Hardware Guide
Capacity
Capacity GB
(decimal GB)
(binary GiB)
72
68
144
136
300
272
600
900
1200
500
465
750
698
1000
931
2000
1862
3000
2794
500
2792
750
1000
2000
3000
Checksum
Right-sized
type
capacity
(binary GiB)
BCS
66
(512/520 blocks,
132
approximately
1.5%)
265
BCS
413
(8/9 blocks,
620
approximately
11.1%)
827
1655
2483
AZCS
(approximately
1.5%)
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