Compaq Infortrend Manuale Utente
Functional Description
1-16
Different write policies within a logical volume?
As members of a logical volume, all logical drives will be forced to adopt a
consistent write policy. Whenever the write policy of a logical volume is
changed, for example, the corresponding setting in its members will also be
changed.
consistent write policy. Whenever the write policy of a logical volume is
changed, for example, the corresponding setting in its members will also be
changed.
RAID expansion with logical volume?
The Logical Volume can also be expanded using the RAID
expansion function. The concept of expanding a logical volume is
similar to that of expanding a logical drive. To perform RAID
expansion on a logical drive, replace each member physical drive
with a drive of larger capacity or add a new drive, then perform
logical drive expansion to utilize the newly-added capacity. For
information about RAID expansion, please refer to Chapter 9
"Advanced Configurations."
expansion function. The concept of expanding a logical volume is
similar to that of expanding a logical drive. To perform RAID
expansion on a logical drive, replace each member physical drive
with a drive of larger capacity or add a new drive, then perform
logical drive expansion to utilize the newly-added capacity. For
information about RAID expansion, please refer to Chapter 9
"Advanced Configurations."
To perform RAID expansion on a logical volume, expand each
member logical drive, then perform “RAID Expansion” on the
logical volume.
member logical drive, then perform “RAID Expansion” on the
logical volume.
Steps to expand a Logical Volume:
1.
Expand each member logical drive.
2.
Expand the logical volume.
3.
Map the newly-added capacity (in the form of a new partition)
to a host LUN.
to a host LUN.
IMPORTANT!
•
If a logical unit has already been partitioned, and you wish to expand its
capacity, the added capacity will be appended to the last partition. You
will not be able to proceed with expansion using firmware version earlier
than 3.27 when the unit already has 8 partitions.
•
Unless you move your data and merge two of the partitions, you will be
not allowed to expand your logical volume. This is a precautionary
limitation on logical unit expansion.
Different controller settings using logical volume?
Redundant Controller:
Without logical volume - logical drives can be assigned to the
primary or the secondary controller. The host I/Os directed to a
logical drive will be managed by the controller which owns the
primary or the secondary controller. The host I/Os directed to a
logical drive will be managed by the controller which owns the