Hits and Tips
To manually align the VMFS block boundaries to the Storage Center page boundaries for your own performance testing, the recommended offset when creating a new datastore is 8192 (or 4 MB).
Recommended queue depth settings for controllers with 4/8 GBPS FE ports:
- HBA BIOS = 255
- Driver module = 255
- Disk.SchedNumReqOutstanding = 32 (Default but Increase/decrease as necessary)
Find the appropriate driver name for the module that is loaded:
vmkload_mod –l |grep qla
Next, set the driver queue depth and timeouts
esxcfg-module -s ql2xmaxqdepth=255 ql2xloginretrycount=60 qlport_down_retry=60
Next, you need to update the boot config:
As mentioned earlier the Compellent is an active-active controller hence the SATP plugin will have to be changed:
esxcli nmp satp setdefaultpsp --psp VMW_PSP_RR --satp VMW_SATP_DEFAULT_AA
Note: The round robin path selection policy should not be used for volumes belonging to guests running Microsoft Clustering Services
Note: mappings that already existed beforehand will have to be set manually.