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Virtual SCSI drives XTCC
8.13 Virtual SCSI drives
8.13.1 Object information on virtual tape drives
Drives of this type are designated as VDrives.
In contrast to real drives, an associated SCSI controller exists only when the logical volume
is located on the local disk. This is the case with a VTC, for example. In the case of Cen-
tricStor systems with an external RAID, a logical volume is addressed via a mount point
(e.g. 'raid102'). Access takes p lace via the mount point by means of a fully-automatic path
switchover depending on which FC controller is used to access the external RAID (in the
event of FC redundancy).
A virtual drive is symbolized by a rectangle subdivided into lines. If a logical volume is moun-
ted, the write protection (in the form of a padlock) and the name of the volume are displayed
in the top line. With an internal RAID the bottom line contains the information <c>, <t>, <s>
(Controller, Target, Slice) or <c>, <t>, <s>, <l> (Controller, Target, Slice, LUN) depending
on the filesystem. With an external RAID the Base Directory is displayed.
The drive’s display unit is emulated in the middle line, which is highlighted in yellow.
VSN location in case of external RAID
VSN location in case of internal RAID