PRIMECLUSTER Global Disk Services Configuration and Administration Guide 4.2 (Linux)

A.2.18 To Use EMC Symmetrix

For using an EMC's Symmetrix storage unit, EMC's PowerPath is essential. GDS is capable of managing EMC Symmetrix emcpower devices.

The following devices are exceptions to devices that can be managed by GDS.

• native devices configuring emcpower devices

• BCV (Business Continuance Volume) devices

• SRDF target (R2) devices

• GateKeeper devices

• CKD (Count Key Data) devices

• VCMDB (Volume Configuration Management Data Base) used by EMC's SAN management software (Volume Logix, ESN Manager, SAN Manager and so on).

After completing the configuration of these devices and EMC software, follow the procedure below and describe a list of devices excluded from disk management by GDS in the /etc/opt/FJSVsdx/lib/exdevtab file (referred to as the Excluded Device List). The Excluded Device List must include all disks that cannot be managed by GDS in addition to the devices above.

[Procedure]

1. The syminq command provided by SYMCLI is available for checking BCV, R2, GateKeeper, and CKD devices. Execute the syminq command, and describe all devices indicated as BCV, R2, GK, and CKD (sdX, emcpowerX) in the Excluded Device List.
   
   

2. The syminq command is unavailable for checking VCMDB devices. When using EMC's SAN management software (Volume Logix, ESN Manager, SAN Manager and so on), ask your EMC engineer or systems administrator who configured that SAN management software about the names of VCMDB devices and describe them in the Excluded Device List.
   
   

3. Describe all native devices (sdX) in the Excluded Device List.
   

   emcpower0 (Target)
   sdb (Nontarget)
   sdc (Nontarget)
   

4. In addition to the devices specified in steps 1) through to 3), describe any other devices to be excluded from GDS management in the Excluded Device List.

You are recommended to suffix such tags as "PP", "BCV", "R2", "GK", "CKD" and "VCMDB" to the device names for Excluded Device List management efficiency. A device name and a tag must be separated by one or more spaces.

The Excluded Device List should appear as follows.

# cat /etc/opt/FJSVsdx/lib/exdevtab
/dev/emcpowerc BCV
/dev/emcpowerd BCV
/dev/emcpowere GK
/dev/emcpowerf GK
/dev/emcpowerg CKD
/dev/emcpowerh R2
/dev/sdb PP
/dev/sdc PP
...
/dev/sdp PP
/dev/sdq PP
#

exdevtab.sh

The script samples "/etc/opt/FJSVsdx/bin/exdevtab.sh" for simply creating the Excluded Device List "/etc/opt/FJSVsdx/lib/exdevtab" are provided.

To use one of these script, open the script with an editor and modify the following two parameters (the syminq command and powermt command paths) according to the execution environment.

SYMINQ=/usr/symcli/bin/syminq
POWERMT=/etc/powermt

By executing exdevtab.sh, the native devices of emcpower devices and all BCV, GateKeeper, and CKD devices are included in the Excluded Device List. R2 devices and VCMDB devices will not be included in the list. If necessary, edit exdevtab.sh in advance or add any other disks to be excluded from GDS management to the list using the above steps 1 through to 4.

Using EMC TimeFinder or EMC SRDF in a Proxy Configuration [Linux2.6]

For using EMC TimeFinder or EMC SRDF in a proxy configuration, do not describe BCV and R2 devices connected with proxy groups in the Excluded Device List, but describe the native devices that compose those devices in the list. For details, see "Using EMC TimeFinder or EMC SRDF in a Proxy Configuration [Linux2.6]."

For PRIMECLUSTER Systems

• In a PRIMECLUSTER system, create Excluded Device Lists on all nodes that constitute the cluster.

• Devices that cannot be managed with GDS are also nontargets of resource registration, and do not describe these devices in the shared disk definition file. For details on resource registration and the shared disk definition file, see "Shared Disk Unit Resource Registration."

Devices Described in exdevtab

A disk device described in the exdevtab file cannot be registered with a class.
If an attempt to register the disk device included in the exdevtab file is made, an error massage "ERROR: physical disk name: no such device" is output.