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Galaxy Web GUI User Reference Manual

2-4 Before You Start: Understanding GALAXY Storage Architecture

Physical drives are included in logical drives. If a

logical drive is not partitioned, all its capacity will

appear as a single “partition 0.”

In a standard HDX3 and older RAIDs, logical

volumes and multiple partitions in an LD are

optional.

3. The HDX4 Data Service features include: Snapshot, Volume Copy,

Volume Mirror, and a scheduler tool for these features.

4. The Data Service functions in the HDX4 DS series can only be configured

through the Storage Manager console. You can not create Data Service

configurations using an RS-232 terminal and LCD keypad.

5. There are limitations for HDX3 and HDX4 DS series:

• A standard HDX3 cannot be upgraded to HDX4 DS.

• A Logical Volume in HDX4 DS cannot span across two DS RAID

systems.

• An HDX4 DS cannot be downgraded to HDX3.

• A Physical LD configured in HDX3 cannot be moved and installed into a

Logical Volume in HDX4 DS.

Limitations on storage volumes are:

• You can not divide a logical partition (create another partition from an

existing one; yet you can create partitions as long as there is free space

in a volume).

• You can not shrink the size of an existing partition.

• The size of a logical volume can start from 11GB to 256TB

• Max. no. of logical volumes per system – 16

• Max. no. of logical drives per logical volume – 16

• Min. size of a logical partition – 11GB

• Max. no. of partitions per logical volume -128

• Logical volumes can be expanded. To expand a logical volume, expand

all logical drives within it, and then you exert the Expand Logical

Volume command.

Software features are separately-purchased and available via software

licenses:

They include:

• Galaxy HDX4 DS In-System Replication (Snapshot + Volume

Copy/Mirror of volumes within the same storage configuration consisting

of 1 RAID system and multiple JBODs)

• Galaxy HDX4 DS Remote Replication (Copy or Mirror between

volumes managed by two different systems)

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