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vxdmp io policy foundation suite 5.1 on OEl 5.5

sunguru
Level 4

Hi

 

Can some one pls let me know what should be i/o policy setting for load balance on system running Oracle Enterprise Linux 5.1 connected to Symmetrix ( DMX4) array , since currently we only 2 paths to DMX 4 and we added 4 additional 4 FA's and i/o is not equally goinng thru on all FA's and still it uses old paths for the i/o

 

Current settings:-

 vxdmpadm getattr enclosure emc0
ENCLR_NAME      ATTR_NAME                     DEFAULT        CURRENT
============================================================================
emc0           iopolicy                      MinimumQ       MinimumQ
emc0           partitionsize                 512            512
emc0           use_all_paths                 -              -
emc0           failover_policy               Global         Global
emc0           recoveryoption[throttle]      Nothrottle[0]  Nothrottle[0]
emc0           recoveryoption[errorretry]    Fixed-Retry[5] Fixed-Retry[5]
emc0           redundancy                    0              0
emc0           failovermode                  -              -

 

rpm -qa |grep -i vrts
VRTSperl-5.10.0.7-RHEL5.3
VRTSaslapm-5.1.00.00-GA_RHEL5
VRTSfssdk-5.1.00.00-A39_RHEL5
VRTSvcs-5.1.00.00-GA_RHEL5
VRTScutil-5.1.00.00-GA_GENERIC
VRTSdbed-5.1.0.0-RHEL5
VRTSvlic-3.02.51.0000-0
VRTSspt-5.5.00.0-GA
VRTSvxvm-5.1.00.00-GA_RHEL5
VRTSlvmconv-5.1.00.00-GA_RHEL5
VRTSvxfs-5.1.00.00-A39_RHEL5
VRTSllt-5.1.00.00-GA_RHEL5
VRTSvxfen-5.1.00.00-GA_RHEL5
VRTScps-5.1.00.00-GA_RHEL5
VRTSvcsdr-5.1.00.00-GA_RHEL5
VRTSatClient-5.0.32.0-0
VRTSvcsea-5.1.00.00-GA_RHEL5
VRTSodm-5.1.00.00-A39_RHEL5
VRTSob-3.4.235-0
VRTSsfmh-2.1.198.0-0
VRTSgab-5.1.00.00-GA_RHEL5
VRTSvcsag-5.1.00.00-GA_RHEL5
VRTSatServer-5.0.32.0-0

 

1 ACCEPTED SOLUTION

Accepted Solutions

Gaurav_S
Moderator
Moderator
   VIP    Certified

Hello,

 

From the Linux 5.1 admin guide you can see:

http://sfdoccentral.symantec.com/sf/5.1/linux/html/vxvm_admin/ch04s08s16.htm

 

minimumq

This policy sends I/O on paths that have the minimum number of outstanding I/O requests in the queue for a LUN. No further configuration is possible as DMP automatically determines the path with the shortest queue.

The following example sets the I/O policy to minimumq for a JBOD:

# vxdmpadm setattr enclosure Disk \
  iopolicy=minimumq

This is the default I/O policy for all arrays.

 

You can tune the IOpolicy as per your environment needs. See the link mentioned above for description of all type of IOpolicies

 

Gaurav

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1 REPLY 1

Gaurav_S
Moderator
Moderator
   VIP    Certified

Hello,

 

From the Linux 5.1 admin guide you can see:

http://sfdoccentral.symantec.com/sf/5.1/linux/html/vxvm_admin/ch04s08s16.htm

 

minimumq

This policy sends I/O on paths that have the minimum number of outstanding I/O requests in the queue for a LUN. No further configuration is possible as DMP automatically determines the path with the shortest queue.

The following example sets the I/O policy to minimumq for a JBOD:

# vxdmpadm setattr enclosure Disk \
  iopolicy=minimumq

This is the default I/O policy for all arrays.

 

You can tune the IOpolicy as per your environment needs. See the link mentioned above for description of all type of IOpolicies

 

Gaurav