01-12-2011 09:40 AM
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
Solved! Go to Solution.
01-12-2011 10:50 PM
Hello,
From the Linux 5.1 admin guide you can see:
http://sfdoccentral.symantec.com/sf/5.1/linux/html/vxvm_admin/ch04s08s16.htm
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
01-12-2011 10:50 PM
Hello,
From the Linux 5.1 admin guide you can see:
http://sfdoccentral.symantec.com/sf/5.1/linux/html/vxvm_admin/ch04s08s16.htm
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