Sun StorageTek 6000 and 2500 Series Arrays: How to Change the Segment Size for a Volume Using CAM

Asset ID:	1-71-1005170.1
Update Date:	2017-10-05
Keywords:

Solution Type Technical Instruction Sure

Solution 1005170.1 : Sun StorageTek 6000 and 2500 Series Arrays: How to Change the Segment Size for a Volume Using CAM

Applies to:

Sun Storage 6540 Array - Version Not Applicable and later
Sun Storage 6180 Array - Version Not Applicable and later
Sun Storage 2530 Array - Version Not Applicable and later
Sun Storage 6780 Array - Version Not Applicable and later
Sun Storage 2510 Array - Version Not Applicable and later
All Platforms

Goal

This document outlines the steps to change the segment size of an existing volume using Common Array Manager (CAM). The procedure preserves all data and may be done online via the Command Line Interface, (using sscs), or with the Web Browser Interface. Both approaches are provided herein.

Solution

1. Document your current volume attributes:

Using Common Array Manager GUI :

Select Storage Systems
Expand Your Array Name
Click Volumes
Click on the Volume Link for your volume name
Note the Pool for this volume
Click Pools in the left menu panel
Click Pool Link for the name of the pool from step 5
Note the currently selected Profile for this pool
Click Profiles from the left menu panel
Click Profile Link for the name of the profile in step 8

Using Common Array Manager CLI (sscs):

The sscs CAM command-line interface is found in the following locations:

Solaris: /opt/SUNWstkcam/bin/
Linux: /opt/sun/cam/bin/
Windows: C:\Program Files\Sun\Common Array Manager\bin

Get the profile name (and details) for the volume.

# sscs list -a array_name volume volume_name | grep Profile

For example:
# sscs list -a s2510-array-a volume 512-vol | grep Profile
Profile: Default

# sscs list -a array_name profile profile_name

For example:
# sscs list -a s2510-array-a profile Default
Profile: Default
Profile In Use:            Yes
Factory Profile:           Yes
Description:               Pre-configured Default profile
RAID Level:                5
Segment Size:              512 KB
Read Ahead:                On
Optimal Number of Drives: Variable
Disk Type:                 Any
Dedicated Hot Spare:       No
Pool:                      Default

Note the following attributes for subsequent work.

RAID Level
Segment Size
Read Ahead Cache setting
Number of drives
Drive type

2. Create a new profile with the desired transition segment size:

Using CAM GUI :

Select Storage Systems
Select Profiles
Click the New Button
Define a profile exactly like the current one, except for the segment size (see note on allowable segment size values)
Click OK

Using CAM CLI :

Create the new profile based on the following options for sscs:

# sscs create -a arrayname -r RAIDLEVEL -s segment_size -h read_ahead -n #drives -k drive_type profile profile_name

For Example:
# sscs create -a s2510-array-a -r 5 -s 256K -h off -n variable -k ANY profile new_256K_profile

NOTE: The segment can only transition by double or half the current value for the volume. For example, 512K can go to 256K or 1024K only.

3. Create a New Pool for This Profile:

Using CAM GUI :

Select Storage Systems
Expand Your Array Name
Click Pools
Click New button
Fill in Pool name and select the profile that you created above.

Using CAM CLI :

# sscs create -a arrayname -p new_profile pool new_pool_name

For example:
# sscs create -a s2510-array-a -p new_256K_profile pool new_256K_pool

4. Change the Pool of the Volume to the New Pool:

Using CAM GUI :

Select Storage Systems
Expand Your Array Name
Click Volumes
Click on the Volume Link for your volume name
Change the Pool Drop-down to the new pool name
Click Save

Using CAM CLI :

# sscs modify -a array_name -p new_pool_name volume volume_to_be_modified

For example:
# sscs modify -a s2510-array-a -p new_256K_pool volume 512-vol

5. Review the Job Completion:

Using CAM GUI :

Select Storage Systems
Expand Your Array Name
Click Jobs

Using CAM CLI :

# sscs list -a s2510-array-a jobs
Job ID: 2012.12.28.09.29.42.209 Status: In progress
# sscs list -a s2510-array-a jobs 2012.12.28.09.29.42.209
Job ID: 2012.12.28.09.29.42.209
Type:                Volume Segment Size Change
Status:              In progress
% Complete:          78
Time to Completion: 00:00:05
Priority:            Unknown

NOTE: Only a single segment resize operation per volume may be executed, at a given time.

Upon completion of the job, you can use sscs to see the new segment size of the volume.

# sscs list -a s2510-array-a volume 512-vol
Volume: 512-vol
Type:                            Standard
WWN:                             60:0A:01:80:00:00:AB:CD:00:00:AB:CD:EF:00:01:BD
Pool:                            new_256K_pool
Profile:                         new_256K_profile
Virtual Disk:                    3
Size:                            2.000 GB
State:                           Free
Status:                          Online
Action:                          Ready
Condition:                       Optimal
Read Only:                       No
Controller:                      B
Preferred Controller:            B
Modification Priority:           High
RAID Level:                      5
Segment Size:                    256 KB
Read Cache:                      Disabled
Write Cache:                     Enabled
Write Cache with Replication:    Enabled
Write Cache without Batteries:   Disabled
Write Cache Active:              True
Flush Write Cache After:         10 s
Disk Scrubbing:                  Disabled
Disk Scrubbing with Redundancy: Disabled
Security:                        None
Pre-Read Redundancy Check:       Disabled

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