Modify Copy Table Size

Overview

This function sets the copy table size, which is used by the firmware for the storage system, on the CM cache memory. The copy table is used as an area that manages the progress of the copy when Advanced Copy sessions or Veeam sessions are used.

Caution

  • A license must be registered for the Advanced Copy function or the Unified Storage environment is required to use this function.

  • When the copy table size is equal to 0 MB, copy functions cannot be used. For the ETERNUS DX500 S5/DX600 S5/DX900 S5, the ETERNUS DX8100 S4/DX8900 S4, and the ETERNUS AF650 S3, the copy table size is set to the default value of 0 MB at the factory. Modify the copy table size before using the copy function.

  • Make sure to stop the copy session before reducing the copy table size. To check the copy session, use the [Advanced Copy] function.

  • Cache memory is not only used for copy tables, but also used for REC Buffers, the Thin Provisioning function (*1), the Storage Cluster function (*1), the Non-disruptive Storage Migration function, and the Extreme Cache function. Note that a copy table with the maximum capacity for each model cannot always be created depending on the following conditions.

    • Memory capacity in the storage system

    • REC Buffer size

    • Maximum pool capacity

    • Total TFOV capacity (*2)

    • License registration for the Non-disruptive Storage Migration function

    • Extreme Cache setting (enabled) and Extreme Cache capacity

    *1  :  The shared area in the cache memory is used for the following conditions.

    • The maximum pool capacity is expanded to "1.5 PB" or larger

    • The total TFOV capacity (*2) has been expanded from the default capacity

      Refer to the descriptions about "Storage Cluster" in the [System] screen for the default capacity of the TFOV for each model.
    *2  :  The total TFOV capacity indicates the total capacity of the volumes that are used for the Storage Cluster function in a storage system.

  • If the copy table size is insufficient, an error occurs in the copy session. Make sure to specify the "Table Size Threshold" value to monitor the usage of the copy table in advance. The storage system reports the notification using the method specified with the [Setup Event Notification] function. When reporting, select the notification method in advance.

  • Set the resolution as small as possible. When a large value is specified, the performance may be reduced. When unsure about whether the copy target area might be increased in future use, specify the maximum resolution.

  • The same resolution must be used by both the copy source and copy destination storage systems for REC. If the resolution settings for the copy source and copy destination storage systems are different, REC cannot be performed. Note that the copy table sizes do not need to be the same. If different recommended resolutions are calculated for the copy source and copy destination storage systems, use whichever resolution is greater for both storage systems. If the resolution is changed, recalculate the copy table size setting for the storage system with the new resolution.

Note

  • Changes to the resolution setting are applied from the next session. For a copy session that is currently being performed, data is copied with the resolution that was specified when the session was started. Restore OPC operates with the same resolution as the target session. Restore OPC for copy sessions that have been running even before the resolution is changed operates with the same resolution as the copy sessions that are running. To change the resolution of a copy session that is currently being performed, cancel the copy session and start again.

  • When the table size or the table size threshold is changed, the new value is applied immediately.

  • The current copy table size can be checked. Refer to the [Settings (Advanced Copy)] function for details.

  • The copy table size does not need to be set for the following functions.

    • ODX

    • XCOPY

    • Storage Cluster

    • Copy using Virtual Volumes (VVOLs)

User Privileges

Availability of Executions in the Default Role

Default role Availability of executions
Monitor  
Admin
StorageAdmin
AccountAdmin  
SecurityAdmin  
Maintainer

Refer to User Roles and Policies for details on the policies and roles.

Settings

In this screen, set the Advanced Copy table size. To estimate the recommended value for the Advanced Copy table size based on copy capacity and number of sessions, click the [Calculation of recommended values] button.

Advanced Copy Table Size Setting

Item Description Setting values

Resolution

Select the resolution for the copy table.

×1 (*1)

×2

×4

×8

×16 (*2)

×32

×64

*1  :  Default value (for the ETERNUS DX500 S5/DX600 S5/DX900 S5, the ETERNUS DX8100 S4/DX8900 S4, and the ETERNUS AF650 S3)
*2  :  Default value (for the ETERNUS DX60 S5/DX100 S5/DX200 S5 and the ETERNUS AF150 S3/AF250 S3)

Table Size

Select the copy table size.

The copy table size can be set up to the maximum size that is calculated from the installed memory capacity and the usable cache memory capacity in the storage system (excluding the currently used capacity such as assigned size to the REC Buffers).

Caution

  • In the ETERNUS DX100 S5, a total size of 512 MB of memory is reserved for the copy table and REC Buffer. If an REC Buffer is created, 256 MB (REC Buffer size, 128 MB x 2) of the total memory size is used. Therefore, the maximum table size is 256 MB. Note that an REC Buffer cannot be created if the copy table size is larger than 264 MB.

The maximum copy table size for each model is as follows:

ETERNUS DX60 S5:

0 - 128 MB (integral multiple of 8), 128 MB (Default)

ETERNUS DX100 S5/DX200 S5:

0 - 512 MB (integral multiple of 8), 128 MB (Default)

ETERNUS DX500 S5:

0 (Default) - 1024 MB (integral multiple of 8)

ETERNUS DX600 S5:

0 (Default) - 4096 MB (integral multiple of 8)

ETERNUS DX900 S5:

0 (Default) - 12288 MB (integral multiple of 8)

ETERNUS DX8100 S4:

0 (Default) - 1024 MB (integral multiple of 8)

ETERNUS DX8900 S4:

0 (Default) - 12288 MB (integral multiple of 8)

ETERNUS AF150 S3/AF250 S3:

0 - 512 MB (integral multiple of 8), 128 MB (Default)

ETERNUS AF650 S3:

0 (Default) - 4096 MB (integral multiple of 8)

Table Size Threshold

Specify the threshold for monitoring the used capacity of the copy table.

1 - 100 %

80 % (Default)

[Calculation of recommended values]

To calculate "Resolution" and "Table Size", enter "Total Copy Capacity" and the number of "Sessions" and click the [Calculation] button.

When using OPC, QuickOPC, SnapOPC, or SnapOPC+, specify "Total Copy Capacity" and "Sessions" for "Restore OPC is used".

Item Description Setting values

Total Copy Capacity

(Restore OPC is not used)

Input the total copy capacity (*1) when Restore OPC is not used (unit: GB).

The applicable Advanced Copy types are as follows:

  • EC

  • REC

  • OPC, QuickOPC, SnapOPC, and SnapOPC+ without using Restore OPC

Numeric characters [GB]

(decimal)

Total Copy Capacity

(Restore OPC is used)

Input the total copy capacity (*1) for using Restore OPC (unit: GB).

The applicable Advanced Copy types are as follows:

  • OPC, QuickOPC, SnapOPC, and SnapOPC+ using Restore OPC

Numeric characters [GB]

(decimal)

Sessions

(Restore OPC is not used)

Input the total number of sessions (*1) for not using Restore OPC.

The applicable Advanced Copy types are as follows:

  • EC

  • REC

  • OPC, QuickOPC, SnapOPC, and SnapOPC+ without using Restore OPC

ETERNUS DX60 S5: 0 - 1024

ETERNUS DX100 S5: 0 - 2048

ETERNUS DX200 S5: 0 - 4096

ETERNUS DX500 S5/DX600 S5: 0 - 8192

ETERNUS DX900 S5: 0 - 32768

ETERNUS DX8100 S4: 0 - 4096

ETERNUS DX8900 S4: 0 - 32768

ETERNUS AF150 S3: 0 - 2048

ETERNUS AF250 S3: 0 - 4096

ETERNUS AF650 S3: 0 - 8192

Blank (Default)

Sessions

(Restore OPC is used)

Input the total number of sessions (*1) for using Restore OPC.

The applicable Advanced Copy types are as follows:

  • OPC, QuickOPC, SnapOPC, and SnapOPC+ using Restore OPC
*1  :  For "Total Copy Capacity" and "Sessions", input the respective total values.

Example 1: When executing 10 GB OPC (Restore OPC is used) with 20 sessions and 5 GB QuickOPC (Restore OPC is used) with 10 sessions

       Copy Capacity (Restore OPC is used)

         = Copy Capacity for OPC (10 GB × 20 sessions) + Copy Capacity for QuickOPC (5 GB × 10 sessions)

         = 200 GB + 50 GB = 250 GB

       Sessions (Restore OPC is used)

         = The number of OPC sessions (20 sessions) + The number of QuickOPC sessions (10 sessions)

         = 30 sessions

Example 2: When executing 10 GB OPC (Restore OPC is not used) with 20 sessions and 5 GB QuickOPC (Restore OPC is used) with 10 sessions

       Copy Capacity (Restore OPC is not used)

         = Copy Capacity for OPC (10 GB × 20 sessions) = 200 GB

       Sessions (Restore OPC is not used)

         = The number of OPC sessions (20 sessions) = 20 sessions

       Copy Capacity (Restore OPC is used)

         = Copy Capacity for QuickOPC (5 GB × 10 sessions) = 50 GB

       Sessions (Restore OPC is used)

         = The number of QuickOPC sessions (10 sessions) = 10 sessions

Advanced Copy Table Size Recommended Values

In this dialog box, calculated resolution and table size are displayed.

Item Description

Resolution

The calculated resolution is displayed.

×1

×2

×4

×8

×16

×32

×64

Table Size

The calculated Advanced Copy table size is displayed.

ETERNUS DX60 S5: 0 - 128 MB

ETERNUS DX100 S5/DX200 S5: 0 - 512 MB

ETERNUS DX500 S5: 0 - 1024 MB

ETERNUS DX600 S5: 0 - 4096 MB

ETERNUS DX900 S5: 0 - 12288 MB

ETERNUS DX8100 S4: 0 - 1024 MB

ETERNUS DX8900 S4: 0 - 12288 MB

ETERNUS AF150 S3/AF250 S3: 0 - 512 MB

ETERNUS AF650 S3: 0 - 4096 MB

Function Button

Button Description

[Calculation of recommended values]

Automatically calculates "Resolution" and "Table Size".

By clicking this button, the "Calculation of recommended values" dialog box is displayed.

[Calculation]

Automatically calculates "Resolution" and "Table Size" from the entered values.

Operating Procedures

Manually Setting the Copy Table Size

  1. Click [Modify Copy Table Size] in [Action].

  2. Specify the parameters, and click the [Set] button.

    → A confirmation screen appears.

    Note

  3. Click the [OK] button.

    → Copy table size setting starts.

  4. Click the [Done] button to return to the [Settings] screen.

Automatically Setting the Copy Table Size

  1. Click [Modify Copy Table Size] in [Action].

  2. Click the [Calculation of recommended values] button.

    → The [Calculation of recommended values] dialog box appears.

  3. Enter the necessary information and click the [Calculation] button.

    → "Resolution" and "Table Size" are automatically calculated.

    Note

    • The calculated values are "Resolution" and "Table Size". It is assumed that almost 100 % of the copy table size is used.

    • When [Calculation of recommended values] is used, the calculation of "Resolution" and "Table Size" makes allowances for a slight increase of the copy capacity. This is why the calculated values are higher than values obtained using the "[How to Calculate the Copy Table Size]".

  4. Click the [OK] button.

    → The calculated values are reflected to "Resolution" and "Table Size" in the "Advanced Copy Table Size Setting" field.

  5. Select the table size threshold and click the [Set] button.

    → A confirmation screen appears.

  6. Click the [OK] button.

    → Copy table size setting starts.

  7. Click the [Done] button to return to the [Settings] screen.

[How to Calculate the Copy Table Size]

A dedicated memory area is required for Advanced Copy management and is allocated as a table size. The table size and resolution settings are determined by the copy capacity and the number of sessions (volumes) that will be run simultaneously.

(Table size (S)) [MB] = (S1) + (S2)

S1: Refers to the table size (MB) for EC/REC and for OPC/QuickOPC/SnapOPC/SnapOPC+ without OPC Restoration

S2: Refers to the table size (MB) for OPC/QuickOPC/SnapOPC/SnapOPC+ with OPC Restoration

  • Round the derived value up to the next multiple of 8 to obtain the correct setting for the copy table size.

  • A copy table of the appropriate size (as derived above) is created in each CM.

  • If the total table size value (S) exceeds the maximum size allowed, adjust the resolution (M) to make the size of table less than or equal to the maximum value. Set the resolution (M) as small as possible.

Caution

  • The same resolution (M) must be used by both the copy source and copy destination storage systems for REC. If the resolution (M) settings for the copy source and copy destination storage systems are different, REC cannot be performed. Note that the copy table sizes (S) do not need to be the same. If different recommended resolutions (M) are calculated for the copy source and copy destination storage systems, use whichever resolution (M) is greater for both storage systems. If the resolution (M) is changed, recalculate the copy table size (S) setting for the storage system with the new resolution.

Note

  • The calculated values are "Resolution" and "Table Size". It is assumed that almost 100 % of the copy table size is used.

  • Allowance should be made for possible increases in the copy capacity.

  • If the resolution is changed when a copy session exists, calculate the copy table size with the previous resolution for the copy session that is being executed. For copy sessions that are created after the resolution has been changed, calculate the copy table size with the new value.

The Table Size for EC/REC and for OPC/QuickOPC/SnapOPC/SnapOPC+ without OPC Restoration (S1)

M: Resolution (The same value is used in the storage system. Set "×1" if possible.)

C1: The total copy capacity (GB) for EC/REC, and OPC/QuickOPC/SnapOPC/SnapOPC+ without OPC Restoration (*1)

N1: The number of sessions for EC/REC, and OPC/QuickOPC/SnapOPC/SnapOPC+ without OPC Restoration

S1 [MB] = ((2 × C1 ÷ M) + N1) × 8 [KB] ÷ 1024 (Round up decimal point)

The Table Size for OPC/QuickOPC/SnapOPC/SnapOPC+ with OPC Restoration (S2)

M: Resolution (The same value is used in the storage system. Set "×1" if possible.)

C2: The total copy capacity (GB) for OPC/QuickOPC/SnapOPC/SnapOPC+ with OPC Restoration (*1)

N2: The number of sessions for OPC/QuickOPC/SnapOPC/SnapOPC+ with OPC Restoration

S2 [MB] = ((2 × C2 ÷ M) + N2) × 2 × 8 [KB] ÷ 1024 (Round up decimal point)
*1  :  For EC, OPC, QuickOPC, SnapOPC, SnapOPC+, and REC copy sources, the copy capacity is the total capacity of all volumes (slices or partitions) in the storage system that are defined as copy sources. For REC copy destinations, the copy capacity is the total capacity of all the volumes (slices or partitions) in the storage system that are defined as copy destinations.

If the storage system is used for both the "EC, OPC, QuickOPC, SnapOPC, SnapOPC+ or REC copy source" and the "REC copy destination", the copy capacity is the total capacity of both.

For multi-copy sessions, the copy capacity is the total capacity of multi-copy source volumes (slices or partitions), multiplied by the number of multi-copy destinations for each copy source. The copy capacity for generation management by SnapOPC+ sessions is the total capacity of copy source volumes (slices or partitions) multiplied by the number of generations in the copy destination volumes for each copy source.