Disk Drive; Disk Capacity - NEC M310 Configuration Manual

2. M110 Component Selection (15)

(3) Disk Drive

(3-1) Disk Drive
When deciding how many disk drives are required, remember that logical disk capacity varies
depending on disk drive type (I/F, capacity) and RAID type. The number of disk drives is dependent on
the amount of logical disk capacity that is required. The amount of required logical disk capacity varies
depending on the amount of data usage and whether or not features (Snapshot, Replication) are
required. Using required logical disk capacity and performance that is required, decide the number of
disk drives, taking into account the disk drive type (I/F, capacity, rotation speed) and RAID type.
At least three disk drives have to be populated with any disk drive types (SAS/NL-SAS/SAS SSD)
Refer to "(5) Supported RAID" for supported RAID types.
Slots #00, #01, and #02 must be populated.

(3-2) Disk Capacity

(Considerations for System Volume)
A system volume, in which performance logs, etc. are automatically saved, is created in the first
binding Pool. System volume capacity is 8.0 GB. (or 8.6GB if 1KB = 1000Byte)
(Considerations for Snapshot)
When using the snapshot feature, it is necessary to create a snapshot reservation area for replication
of a master volume (snapshot).
(Considerations for Replication)
When implementing the replication feature, use the storage system information retention function* and
create a replication reserved volume with the NEC StorageManager application. The capacity of a
replication reserved volume is 8.0GB. (or 8.6GB if 1KB = 1000Byte)
When turning power off via a planned shutdown all storage system information (differential map, etc)
will be backed up onto the replication reserved volume only if it was configured. If the replication
reserved volume is not configured then storage system information will be lost on shutdown. When
restarting after a planned shutdown, I/O load will be generated as data on the MV is fully copied to the
RV. This startup load may be large enough to temporarily affect performance. It is recommended to
operate 24 hours nonstop, especially if running without a replication reserved volume.
* Storage system information retention function is used to backup storage system information such as
the differential map between business volume (MV) and replication volume (RV) onto disk drives.
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