| PRIMECLUSTER Global Disk Services Configuration and Administration Guide 4.1 (Linux) |
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| Appendix A General Notes | > A.2 Important Points |
When 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.
Using EMC TimeFinder or EMC SRDF in a Proxy Configuration
When using EMC TimeFinder or EMC SRDF in a proxy configuration, the BCV and R2 devices connected with the proxy group may not be described in the Excluded Device List. However, native devices configuring such devices must be described in the list. For details, see "Using EMC TimeFinder or EMC SRDF in a Proxy Configuration."
In the Case of a PRIMECLUSTER System
The Excluded Device List must be created on all nodes composing the cluster in the case of a PRIMECLUSTER system.
These devices cannot be the targets of resource registration, and they may not be described in the shared disk definition file. For details, see "Shared Disk Unit Resource Registration"
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.
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.
Describe other devices that cannot be managed by GDS, if any, in the Excluded Device List in addition to the devices included in the list in step 1 and step 2.
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.
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# cat /etc/opt/FJSVsdx/lib/exdevtab |
exdevtab.sh
A sample script, /etc/opt/FJSVsdx/bin/exdevtab.sh, is provided in order to simply create an Excluded Device List, /etc/opt/FJSVsdx/lib/exdevtab.
When using exdevtab.sh, use an editor and change the following two parameters (syminq command and powermt command paths) in exdevtab.sh to have them effective in your environment.
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SYMINQ=/usr/symcli/bin/syminq |
Executing exdevtab.sh creates the descriptions of native devices of emcpower devices and respective BCV, GateKeeper, and CKD devices in the Excluded Device List. R2 devices, and VCMDB devices, are not included. According to need, edit exdevtab.sh in advance or describe any additional disks that cannot be managed by GDS taking step 1 to step 3.
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.
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