Tuning

Overview

The RAID group tuning information is displayed.

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.

Display Contents

The tuning information of the RAID groups is displayed on a list.

RAID Group List

Item Description

No.

The RAID group number is displayed.

Click this item to display the [RAID Group Detail] Screen ([Basic] Tab).

Name

The RAID group name is displayed.

Click this item to display the [RAID Group Detail] Screen ([Basic] Tab).

Status

The RAID group status is displayed.

Refer to "RAID Group Status" for details.

Usage

The usage of the RAID group is displayed.

  • Standard

    A RAID group that is used for creating "Standard", "SDV", or "SDPV" type volumes

  • Standard / WSV

    A RAID group that is used for creating the following volumes:

    • "WSV" and "Standard"

    • "WSV" and "SDV"

    • "WSV" and "SDPV"

  • WSV

    A RAID group that is used for creating "WSV" type volumes

  • TPP

    A RAID group that belongs to a TPP

  • FTRP

    A RAID group that belongs to an FTRP

  • RDB

    A RAID group that is registered as an REC Disk Buffer

  • Extreme Cache Pool

    A RAID group that is registered as an Extreme Cache Pool

  • "-" (hyphen)

    A RAID group that is not used

RAID Level

The RAID level is displayed.

High Performance (RAID1+0)

High Capacity (RAID5)

High Reliability (RAID6)

High Reliability (RAID6-FR)

Reliability (RAID5+0)

Mirroring (RAID1)

Striping (RAID0)

Total Capacity

The total capacity of the RAID groups is displayed.

Rebuild Priority

The rebuild priority of the RAID group is displayed.

When the Rebuild Priority is "Low", give priority to host access.

When the Rebuild Priority is "Middle", give the same priority as the host access to rebuild, copyback, and redundant copy.

When the Rebuild Priority is "High", give priority to rebuild, copyback, and redundant copy.

A "-" (hyphen) is displayed if the RAID group is registered as an Extreme Cache Pool.

DCMF

The Drive Command Multiplying Factor (DCMF) (1 to 10) is displayed.

If the DCMF is changed, the number of commands issued to the drive is increased in multiples of the DCMF set value (if DCMF is "2", it is double).

Drive Access Priority

The drive access priority is displayed.

When "Response" is specified, responses to host I/O are given priority over throughput.

When "Throughput" is specified, throughput is given priority over responses to host I/O.

When the drives that configure the target RAID group are SSDs or SSD SEDs, a "-" (hyphen) is displayed.

Throttle

The throttle value is displayed.

A throttle is the ratio of the number of commands to be issued to a drive at the same time to the maximum number of issuance. When the throttle value is "100 %", the maximum number of commands specified for each drive (the default number of commands) are issued.

If "Disable" is selected for "Drive Tuning Parameter Setting" of [Modify RAID Group Parameters], a "-" (hyphen) is displayed.

This item is not displayed when logged in using a user account that has a "Monitor" role.

Ordered Cut

Ordered Cut (0 - 65535) is displayed.

"Ordered Cut" is the number of commands for optimizing the drive access process (priority control). When "Ordered Cut" is "x", the command to perform the priority control is issued for every x commands issued, and priority control is performed for the command issued before this command.

When "Ordered Cut" is "0", the interval for priority control (priority control at every "x" commands") cannot be specified. All of the commands issued to the drive are processed according to their priority settings.

A "-" (hyphen) is displayed in the following conditions:

  • "Disable" is selected for "Drive Tuning Parameter Setting" of [Modify RAID Group Parameters]

  • Drives that configure the target RAID group are SSDs or SSD SEDs

This item is not displayed when logged in using a user account that has a "Monitor" role.
Caution

  • RAID groups in which LDE is being performed are not displayed in the list.

Filter Setting

Function Description

Filter setting is a function used to display a list of only the RAID groups meeting all the specified conditions.

No filtering is set by default. The following table shows conditions that can be specified.

Item Description Setting values

Name

Input the RAID group name that is to be displayed.

RAID groups matching or partially matching the entered name are displayed.

When not using the RAID group name for filtering, leave this item blank.

RAID group name

Blank

Status

Select the status of the RAID group that is to be displayed.

When not using the RAID group status for filtering, select "All".

All

Refer to "RAID Group Status".

RAID Level

Select the RAID level of the RAID group that is to be displayed.

When not using the RAID level for filtering, select "All".

All

High Performance (RAID1+0)

High Capacity (RAID5)

High Reliability (RAID6)

High Reliability (RAID6-FR)

Reliability (RAID5+0)

Mirroring (RAID1)

Striping (RAID0)