Logical Drives. Promise Technology VTrack M-Class M500p, VTrak M200f, VTrak M500i, VTrak M300p, VTrak M500f, VTrak M500p, VTrak M300f, VTrak M300i, VTrak M200i, VTrak M200p

VTrak M-Class Product Manual

After Transition is completed, refresh the screen. The revertible spare drive will be listed under the Spare Drives icon and the disk array’s operational status will show OK.

To set Transition priority, see “Change Background Settings” on page 71.

Transport

The Disk Array–Transport tab enables you to prepare a disk array for transport.

Important

Before you can use this feature:

• There must be a dedicated spare disk drive assigned to this disk array.

• The disk array Operational Status must be OK.

To prepare a disk array for transport:

1.

Click the Subsystem icon in Tree View.

2.

Click on the Disk Arrays icon.

3.

Click on the Disk Array icon.

4.

Click the Transport tab in Management View.

5.

Click on the Submit button.

6.

In the confirmation box, type the word confirm in the field provided.

7.

Click the OK button.

8.

After the Transition is complete, move the physical drives comprising the disk array to their new locations.

9.

Click the Refresh button in your Browser.

The drives appear in their new locations and disk array status displays.

Logical Drives

The Logical Drives–Information tab displays a list of logical drives along with their status and capacity. Logical drives are made from disk arrays. To access the

Logical Drives–Information tab:

1.

Click the Subsystem icon in Tree View.

2.

Click on the Disk Arrays icon.

3.

Click on the Disk Array icon.

4.

Click on the Logical Drives icon

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The Information tab displays the following:

• Device ID – This is the unique ID number assigned to an individual logical drive.

• Alias – Optional.

• RAID Level – The RAID level of this logical drive (It may differ from the disk array).

• Capacity – This is the data storage capacity available.

• Disk Array ID – The ID number of the disk array from which this logical drive was created.

• Stripe – The stripe size of the logical drive.

• Sector –The sector size of the logical drive.

• Status –The operational status of the logical drive (see below).

Logical Drive Status

• Functional/OK – This is the normal state of a logical drive. When a logical drive is Functional, it is ready for immediate use. For RAID Levels other than

RAID 0 (Striping), the logical drive has full redundancy.

• Synchronizing – This condition is temporary. Synchronizing is a maintenance function that verifies the integrity of data and redundancy in the logical drive.

When a logical drive is Synchronizing, it will function and your data is available. However, access will be slower due to the synchronizing operation.

• Critical/Degraded – This condition arises as the result of a physical drive failure. A degraded logical drive will still function and your data is still available. However, the logical drive has lost redundancy (fault tolerance).

You must determine the cause of the problem and correct it.

• Rebuilding – This condition is temporary. When a physical drive has been replaced, the logical drive automatically begins rebuilding in order to restore redundancy (fault tolerance). When a logical drive is rebuilding, it will function and your data is available. However, access will be slower due to the rebuilding operation.

• Transport Ready – After you perform a successful Prepare for Transport operation, this condition means you can remove the physical drives of this disk array and move them to another enclosure or different drive slots. After you relocate the physical drives, the disk array status will show OK.

• Forced Offline – This drive was forced offline by the user.

• Forced Online – This drive was forced online by the user.

• Transition Running – A Transition is running that involves this physical drive.

• PDM Running – PDM is running on this physical drive.

• Media Patrol Running – Media Patrol is running on this physical drive.

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• Stale – The physical drive contains obsolete disk array information. Click on the Clear tab.

• PFA – The physical drive has errors resulting in a prediction of failure. Click on the Clear tab.

• Offline – This condition arises as the result of a second physical drive failure.

An Offline logical drive is not accessible but some or all of your data may remain intact. You must determine the cause of the problem and correct it.

• Dead – The physical drive has failed.

To create a logical drive, see “Create a Logical Drive” on page 133.

To delete a logical drive, see “Delete a Logical Drive” on page 134.

Logical Drive

The Logical Drive–Information tab displays a list of logical drives along with their status and capacity. Logical drives are made from disk arrays. To access the

Logical Drives–Information tab:

1.

Click the Subsystem icon in Tree View.

2.

Click on the Disk Arrays icon.

3.

Click on the Disk Array icon.

4.

Click on the Logical Drives icon

5.

Click on the Logical Drive icon.

To specify an Alias or set the Read and Write Policies, click on the Settings tab.

Logical Drive Information

• Logical Drive ID – A number assigned to the logical drive by the system.

• Alias – Optional.

• RAID Level – The RAID level of this logical drive.

• Operations Status – The operational status of the logical drive (see below).

• Capacity – This is the data storage capacity of the logical drive.

• Physical Capacity – This is the data storage capacity of the physical drives used in the logical drive.

• Number of Axles – Each axle represents a physical drive.

• Number of Used Physical Drives – The number of physical drives used in this logical drive.

• Stripe Size – The stripe size of this logical drive.

• Sector Size – The sector size of this logical drive.

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• Disk Array ID – The ID number of the disk array from which this logical drive was created.

• Read Policy – The Read Cache policy of this logical drive.

• Write Policy – The Write Cache policy of this logical drive.

• Serial Number – The Serial Number of this logical drive.

• WWN – The World Wide Number of this logical drive.

• Synchronized – Has this logical drive been synchronized? Yes or No.

Logical Drive Statistics (in alphabetical order)

• Data Transferred

• Data Bytes

• Read Data Bytes

• Write Data Bytes

• Error Counts

• Errors

• Non-Read/Write Errors

• Read Errors

• Write Errors

• I/O Request Counts

• IO Request

• Non-Read/Write IO Request

• Read IO Request

• Write IO Request

• Session Received Counts

• Statistics Collection Date/Time

• Statistics Start Date/Time

Logical Drive Settings

The Logical Drive–Settings tab enables you to assign an alias and make cache settings to this logical drive. To make Logical Drive settings:

1.

Click the Subsystem icon in Tree View.

2.

Click on the Disk Arrays icon.

3.

Click on the Disk Array icon.

4.

Click on the Logical Drives icon

5.

Click on the Logical Drive icon.

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6.

Click on the Settings tab in Management View.

7.

Enter an alias in the Logical Drive Alias field.

Maximum of 32 characters. Use letters, numbers, space between words and underscore. An alias is optional.

8.

From the Read Policy dropdown menu, select a Read Cache policy.

The choices are Read Cache, Read Ahead and No Cache.

9.

From the Write Policy dropdown menu, select a Write Cache policy.

The choices are Write Back and Write Through (Thru). If you select No Read

Cache, Write policy is automatically Write Through.

10. Click the Submit button.

Logical Drive Background Activity

The Logical Drive–Background Activity tab provides information about functions that run in the background on this logical drive:

• Logical Drive Initialization

• Logical Drive Redundancy Check

Logical Drive 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.

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.

Initialize a Logical Drive:

1.

Click the Subsystem icon in Tree View.

2.

Click on the Logical Drive Summary icon.

3.

Click on the icon of the logical drive you want to Initialize.

You can also start Initialization from the Subsystem icon Background

Activities tab

4.

Click on the Background Activities tab in Management View.

5.

From the Background Activities dropdown menu, select Initialization.

6.

To select Quick Initialization, check the box.

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If you checked the box, enter a value in the Quick Initialization Size field.

This value is the size of the initialization blocks in MB.

7.

If you did not select Quick Initialization, enter a hexidecimal value in the

Initialization Pattern in Hex field or use the default 00000000 value.

8.

Click the Submit button.

9.

In the confirmation box, type the word confirm in the field provided.

10. Click the OK button.

The Background Activity tab displays the progress of the Initialization.

To set Initialization priority, see “Change Background Settings” on page 71.

Logical Drive Redundancy Check

Redundancy Check is a routine maintenance procedure for fault-tolerant disk arrays (those with redundancy) that ensures all the data matches exactly.

Redundancy Check can also correct inconsistencies.

Redundancy Check a Logical Drive

1.

Click the Subsystem icon in Tree View.

2.

Click on the Logical Drive Summary icon.

3.

Click on the icon of the logical drive you want to Initialize.

You can also start Redundancy check from the Subsystem icon

Background Activities tab

4.

Click on the Background Activities tab in Management View.

5.

From the Background Activities dropdown menu, select Redundancy Check.

6.

To select Auto Fix, check the box.

This feature attempts to repair the problem when it finds an error.

7.

To select Pause On Error, check the box.

This feature stops the process when it finds an error.

If Auto Fix is also checked, the process stops only when it finds a nonrepairable error.

8.

Click the Submit button.

The Background Activity tab displays the progress of the Redundancy Check.

To set Redundancy Check priority, see “Change Background Settings” on page 71.

Logical Drive Synchronization

Synchronization is an automatic procedure applied to logical drives when they are created. Click on the logical drive icon and look under Logical Drive

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Information to see Synchronization. A Yes means the logical drive was synchronized.

To set Synchronization priority, see “Change Background Settings” on page 71.

Logical Drive PDM

Predictive Data Migration (PDM) is the migration of data from the suspect disk drive to a spare disk drive, similar to Rebuilding a Logical Drive. But unlike

Rebuilding, PDM constantly monitors your disk drives and automatically copies your data to a spare disk drive before the disk drive fails and your Logical Drive

goes Critical. See “Predictive Data Migration (PDM)” on page 251.

To run PDM, do the following:

1.

Click the Subsystem icon in Tree View.

2.

Click on the Background Activities tab in Management View.

3.

From the Background Activities dropdown menu, select Start PDM.

4.

From the Source Physical Drive dropdown menu, select a Source disk array.

5.

From the Target Physical Drive dropdown menu, select a Target physical drive.

6.

Click on the Submit button.

A PDM link appears on the Background Activities tab and the percent completed displays.

To set PDM priority, see “Change Background Settings” on page 71.

Logical Drive Check Table

The Logical Drive–Check Table tab enables you to view error tables. Use this information to evaluate the integrity of the logical drive and to determine whether corrective action is needed. To View the tables:

1.

Click the Subsystem icon in Tree View.

2.

Click on the Disk Arrays icon.

3.

Click on the Disk Array icon.

4.

Click on the Logical Drives icon

5.

Click on the Logical Drive icon.

6.

Click the Check Table tab in Management view.

7.

Click the radio button for the table you want to see.

The default is All tables.

If there are entries, they are listed as follows:

• Entry Number – A number assigned to each block of entry.

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