SCSI-3 Persistence Reservation indicates NO for a storage array configured for SCSI-3
| Article:TECH198180 | | | Created: 2012-10-10 | | | Updated: 2012-10-10 | | | Article URL http://www.symantec.com/docs/TECH198180 |
Problem
When viewing storage arrays in Veritas Enterprise Administrator (VEA) under a DSM (VERTIAS DMP Device Specific Module) the column for SCSI-3 Persistence Reservation may indicate NO when it is known the storage array is configured to accept SCSI-3 reserveration commands.
Error
Environment
Storage Foundation for Windows 5.1 and above
Storage Foundation for Windows HA 5.1 and above
Cause
The setting in VEA gui indicates whether SCSI3Support ("SCSI-2 to SCSI-3") translation mode has been enabled within DSM via registry and not the setting on the array or reservation status of any disks from the array. SFW 5.1 and above no longer displays SCSI-3 reservation status of disks in the VEA gui.
Solution
The setting does not indicate a failure to set the storage array for SCSI-3 PGR and is independant of any requirements to do so.
There are two modes of SCSI in VEA:
• DSM “SCSI-2 to SCSI-3” translation mode is used where the application (for example Microsoft Cluster Server 2003) is using SCSI-2 mode, and SFW DSM translates the SCSI-2 to SCSI-3 related reservation in order to allow I/O to use multiple paths on SCSI-3 capable storage. This is set from the registry and is not related to “SCSI-3 mode” setting in VEA. (Refer to the SFW Admin guide for more details.)
• VEA "SCSI-3” mode issues SCSI-3 command directly to a DG cluster disk. There is no need to for a DSM to do “SCSI-2 to SCSI-3” translation with this setting. This SCSI-3 mode is not related to DSM “SCSI-2 to SCSI-3” translation mode.
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Article URL http://www.symantec.com/docs/TECH198180
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