Autodiscovery of EMC Symmetrix arrays


Autodiscovery of EMC Symmetrix arrays
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In VxVM 4.0, there were two possible ways to configure EMC Symmetrix arrays:

With EMC PowerPath installed, EMC Symmetrix arrays could be configured as foreign devices.

See Foreign devices.
Without EMC PowerPath installed, DMP could be used to perform multi-pathing.

On upgrading a system to VxVM 4.1 or later release, existing EMC PowerPath devices can be discovered by DDL, and configured into DMP as autoconfigured disks with DMP nodes, even if PowerPath is being used to perform multi-pathing. There is no need to configure such arrays as foreign devices.

Table: Scenarios for using DMP with PowerPath shows the scenarios for using DMP with PowerPath.

The ASLs are all included in the ASL-APM package, which is installed when you install Storage Foundation products.

Table: Scenarios for using DMP with PowerPath

PowerPath	DMP	Array configuration mode
Installed.	The libvxpp ASL handles EMC Symmetrix arrays and DGC CLARiiON claiming internally. PowerPath handles failover.	EMC Symmetrix - Any DGC CLARiiON - Active/Passive (A/P), Active/Passive in Explicit Failover mode (A/P-F) and ALUA Explicit failover
Not installed; the array is EMC Symmetrix.	DMP handles multi-pathing. The ASL name is libvxemc.	Active/Active
Not installed; the array is DGC CLARiioN (CXn00).	DMP handles multi-pathing. The ASL name is libvxCLARiiON.	Active/Passive (A/P), Active/Passive in Explicit Failover mode (A/P-F) and ALUA

PowerPath

DMP

Array configuration mode

Installed.

The libvxpp ASL handles EMC Symmetrix arrays and DGC CLARiiON claiming internally. PowerPath handles failover.

EMC Symmetrix - Any

DGC CLARiiON - Active/Passive (A/P), Active/Passive in Explicit Failover mode (A/P-F) and ALUA Explicit failover

Not installed; the array is EMC Symmetrix.

DMP handles multi-pathing.

The ASL name is libvxemc.

Active/Active

Not installed; the array is DGC CLARiioN (CXn00).

DMP handles multi-pathing.

The ASL name is libvxCLARiiON.

Active/Passive (A/P), Active/Passive in Explicit Failover mode (A/P-F) and ALUA

If any EMCpower disks are configured as foreign disks, use the vxddladm rmforeign command to remove the foreign definitions, as shown in this example:

# vxddladm rmforeign blockpath=/dev/dsk/emcpower10 \
  charpath=/dev/rdsk/emcpower10

To allow DMP to receive correct inquiry data, the Common Serial Number (C-bit) Symmetrix Director parameter must be set to enabled.

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