ADIC 601356 manual 112

Command Reference

If a list of media specified in a vsmount request contains media of more than one type, the request fails.

When media or drive pairing requires the media be moved within a single library system (such as cross-aisle) the mount may take a while to complete. The -iand -uoptions do NOT apply to intra-library system movement.

When a vsmount request with groups of media or drives is submitted, VolServ attempts to select a drive or media pair where the drive and media are associated with the same library. If multiple drive or media pair are candidates, VolServ selects a drive or media pair from the library with an available drive.

If no drive or media pair associated with the same library exists, VolServ then selects a drive or media pair where the drive and media are associated with a different library. If multiple drive or media pair are candidates, VolServ selects a drive or media pair from the library with the largest number of drives. If all libraries contain the same number of drives, VolServ then selects a drive or media pair from the library with the largest number of media.

When specifying a mount by MediaClass group, and the specified MediaClass group is associated with more than one library, no inter-library media or drive pairing is permitted. The media selected from the MediaClass group must be in the same library as the selected drive; otherwise the Mount request fails.

When media is ejected (as a result of Export, or Checkout, no check is made to determine if a queued Mount request exists for the ejected media. As a result, the Mount request remains queued until a drive is freed. At that time, the Mount request fails because the media is not available. In other words, the request queue is not checked for impact on pending requests each time a resource changes its availability and after media or drive pair is identified. VolServ does not attempt re-pairing based on changed availability of resources.

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