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VTrak M610p Product Manual
204
Capacity Coercion
This feature is designed for fault-tolerant logical drives (RAID 1, 1E, 5, 10, 50,
and 60). It is generally recommended to use physical drives of the same size in
your disk arrays. When this is not possible, physical drives of different sizes will
work but the system must adjust for the size differences by reducing or coercing
the capacity of the larger drives to match the smaller ones. With VTrak, you can
choose to enable Capacity Coercion and any one of four methods.
Enable Capacity Coercion and select the Method in the Controller Settings menu.
See page 80. The choices are:
•
GB Truncate – (Default) Reduces the useful capacity to the nearest
1,000,000,000 byte boundary.
•
10GB Truncate – Reduces the useful capacity to the nearest
10,000,000,000 byte boundary.
•
Group Rounding – Uses an algorithm to determine how much to truncate.
Results in the maximum amount of usable drive capacity.
•
Table Rounding – Applies a predefined table to determine how much to
truncate.
Capacity Coercion also affects a replacement drive used in a disk array.
Normally, when an physical drive fails, the replacement drive must be the same
capacity or larger. However, the Capacity Coercion feature permits the
installation of a replacement drive that is slightly smaller (within 1 gigabyte) than
the remaining working drive. For example, the remaining working drives can be
80.5 GB and the replacement drive can be 80.3, since all are rounded down to
80 GB. This permits the smaller drive to be used.
Without Capacity Coercion, the controller will not permit the use of a replacement
physical drive that is slightly smaller than the remaining working drive(s).
Initialization
Initialization is done to logical drives after they are created from a disk array.
Initialization sets all data bits in the logical drive to zero. The action is useful
because there may be residual data on the logical drives left behind from earlier
configurations. For this reason, Initialization is recommended for all new logical
drives. See “Initializing a Logical Drive” on page 107.
Caution
When you initialize a logical drive, all the data on the logical drive
will be lost. Backup any important data before you initialize a
logical drive.
Summary of Contents for VTRAK M610p
Page 1: ...VTRAK M610p Product Manual Version 1 0 ...
Page 30: ...VTrak M610p Product Manual 18 ...
Page 44: ...VTrak M610p Product Manual 32 ...
Page 47: ...Chapter 4 Management with WebPAM PROe 35 Figure 1 The WebPAM PROe log in screen ...
Page 128: ...VTrak M610p Product Manual 116 ...
Page 184: ...VTrak M610p Product Manual 172 Shutdown complete It is now safe to power off the subsystem ...
Page 274: ...VTrak M610p Product Manual 262 ...