Slow read performance on HP StoreAll Storage Server

Read Performance from disk library mountpath using CIFS from Ibrix file system is poor.

Symptoms

Library operations such as Synthetic Full, auxiliary copy, or restore suffer slow read performance when using CIFS paths from HP StoreAll Storage using Ibrix file system.  Jobs take a long time to complete.

Causes

Ibrix file system's "enable_oplocks" setting is set to true/enabled on the active Fusion Manager (FM) settings.  However, it is set to false/disabled at the nodes HP-SMB/CIFS stack registry on all File Serving Nodes (FSNs). This inconsistency between FM and FSN settings has strong impact on performance of some type of read workloads.

Resolution

On all FSNs :

1. Verify EnableOplocks is set to 0 (e.g. false) with the following command:

# /opt/likewise/bin/lwregshell ls "[HKEY_THIS_MACHINE\Services\lwio\Parameters\Drivers\ibfs]"

2. Change the EnableOplocks setting to 1 (e.g. true/enable) with the following command:

# /opt/likewise/bin/lwregshell set_value "[HKEY_THIS_MACHINE\Services\lwio\Parameters\Drivers\ibfs]" "EnableOplocks" 1

3. Verify the value is now correctly set to true/enabled :

# /opt/likewise/bin/lwregshell ls "[HKEY_THIS_MACHINE\Services\lwio\Parameters\Drivers\ibfs]"

4. Restart HP SMB / CIFS stack :

# ibrix_server -s -t cifs -c restart

See following HP article for details:

http://h20565.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/mostViewedDisplay?javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.prp_efb5c0793523e51970c8fa22b053ce01=wsrp-navigationalState%3DdocId%253Dmmr_kc-0117652-5%257CdocLocale%253Den_US&javax.portlet.tpst=efb5c0793523e51970c8fa22b053ce01&sp4ts.oid=4058820&ac.admitted=1408042973391.876444892.492883150