Dell NetWorker 19.9 Administration Guide

Restrictions for use of the SCSI Reserve/Release setting

There are restrictions for using the SCSI Reserve or Release setting.

Consider the following:

• It is available on CDI platforms only. Consequently, since CDI is not supported within an NDMP environment, Reserve/Release is not supported with NDMP.
• Not all drives support persistent Reserve/Release. (All drives support at least simple reserve release. The code automatically drops back from Persistent +APTPL or Persistent to Simple on drives that do not support Persistent.)
• SCSI resets can clear Simple reservations at the device.
• Even with Reserve/Release, there is no guarantee against data loss.
• If the operating system has its own Reserve/Release feature, that feature must be disabled in order for the NetWorker Reserve/Release feature to work.
• Even if all of the enterprise’s NetWorker storage nodes have this feature enabled, then it is possible that, on the storage node where a backup operation is run, data loss can be caused by the operating system’s utilities or by third-party programs.