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CAUTION: The procedure for changing the default SATP rules to use the round robin I/O
multipathing policy is intended to apply only to VMware hosts using HP 3PAR StoreServ Storage
LUNs. If the host is sharing storage from other vendors, then before making any I/O policy changes,
consideration should be given to the effect that changing the default rules will have on the storage
environment as a whole.
A change of the default PSP for a given SATP affects all storage devices (FC, FCoE, iSCSI) that
use the same default SATP rule. If a host is sharing multiple storage vendors together with an
HP 3PAR StoreServ Storage, and if the other connected storage does not support active/active
round robin multipathing using the same SATP rule, such as VMW_SATP_DEFAULT_AA or
VMW_DEFAULT_ALUA, then its multipathing will be also be affected.
If the other storage uses a different SATP of its own, then SATP VMW_SATP_DEFAULT_AA mapping
should be changed to VMW_PSP_RR to take advantage of round-robin multipathing. You can
check the SATP-PSP relationship of a given device for ESX 4.0 by using the esxcli nmp device
list or esxcli nmp device list -d <device id> command.
For example, If the HP 3PAR StoreServ Storage and storage X are connected to the same host
using VMW_SATP_DEFAULT_AA, and if storage X does not have its own SATP, then it might cause
an issue if storage X does not support round-robin multipathing. If the HP 3PAR StoreServ Storage
and storage Y are sharing the same host, and if storage Y has its own SATP VMW_SATP_Y and
HP uses VMW_SATP_DEFAULT_AA, then there will be no conflict, and the change can be made.
ESX/ESXi 4.1 GA - 4.1 Ux
HP 3PAR custom SATP rule for use with persona 6/Generic-legacy (Active-Active array port
presentation)
# esxcli nmp satp addrule -s "VMW_SATP_DEFAULT_AA" -P "VMW_PSP_RR" -O iops=100 -c
"tpgs_off" -V "3PARdata" -M "VV" -e "HP 3PAR Custom iSCSI/FC/FCoE Rule"
To remove the above active-active custom SATP rule:
# esxcli nmp satp deleterule -s "VMW_SATP_DEFAULT_AA" -P "VMW_PSP_RR" -O iops=100 -c
"tpgs_off" -V "3PARdata" -M "VV" -e "HP 3PAR Custom iSCSI/FC/FCoE Rule"
HP 3PAR custom SATP rule for use with persona 11/VMware (ALUA compliant array port
presentation)
# esxcli nmp satp addrule -s "VMW_SATP_ALUA" -P "VMW_PSP_RR" -O iops=100 -c "tpgs_on"
-V "3PARdata" -M "VV" -e "HP 3PAR Custom iSCSI/FC/FCoE ALUA Rule"
To remove the above ALUA custom SATP rule:
# esxcli nmp satp deleterule -s "VMW_SATP_ALUA" -P "VMW_PSP_RR" -O iops=100 -c "tpgs_on"
-V "3PARdata" -M "VV" -e "HP 3PAR Custom iSCSI/FC/FCoE ALUA Rule"
ESXi 5.x
HP 3PAR custom SATP rule for use with persona 6/Generic-legacy (Active-Active array port
presentation)
# esxcli storage nmp satp rule add -s "VMW_SATP_DEFAULT_AA" -P "VMW_PSP_RR" -O iops=100
–c "tpgs_off" -V "3PARdata" -M "VV" -e "HP 3PAR Custom iSCSI/FC/FCoE Rule"
Multipath Failover Considerations and I/O Load Balancing 43