Compaq Infortrend manual Limitations

Limitations:

The logical volume can not have any logical drive stated as "fatal failed.” If there is any failed drive in any of its member logical drives, controller will start to rebuild that logical drive. Should any of the member logical drives fail fatally, the logical volume fails fatally and data will not be accessible.

To avoid a logical volume failure:

1.Logical drives as members to a logical volume should be configured in RAID levels that provide redundancy - RAID levels 1 (0+1), 3, or 5.

2.Rebuild the logical drive as soon as possible whenever a drive failure occurs. Use of local spares is recommended.

3.A logical drive should be composed of physical drives from different drive channels. Compose the logical drive with drives from different drive channels to avoid the fatal loss of data caused by bus failure.

Partitioning - partitioning the logical drive or partitioning the logical volume?

Once a logical drive has been divided into partitions, the logical drive can no longer be used as a member of a logical volume. The members of a logical volume should have one partition only with the entire capacity.

If you want to use a partitioned logical drive for a logical volume, delete the other partitions in this logical drive until there remains one partition only with the entire capacity. Mind that deleting the partition of the logical drive will also destroy all data. Data should be backed up before making partition configuration.

When a logical drive is used as a member to a logical volume, this logical drive can no longer be partitioned in “View and Edit Logical Drives.” Instead, the Logical Volume can be partitioned into 8 in “View and Edit Logical Volume.”

The procedure for partitioning a logical volume is the same as that for partitioning a logical drive. After the logical volume has been partitioned, map each partition to a host ID/LUN to make the partitions available as individual drives.

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