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XTCC Virtual 3490 drives
8.10 Virtual 3490 drives
8.10.1 Object information and error messages for virtual 3490 drives
Each emulation is assigned its own virtual drive. In this object, the error messages and
behavior of a real drive are simulated as required. Even the display units on real 3490 drives
are reproduced faithfully and have the same displays as the real object of the emulation.
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. 'raid100'). 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).
The overall integration of a virtual drive in CentricStor is displayed in the ICP main window.
The screens below display the information for the virtual drives:
The virtual drive is symbolized by a rectangle subdivided into lines. If a logical volume is
mounted, 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 middle line, displayed against a yellow background, indicates the display unit for the
drive. Here you can see the text that the host loads into the drive display.
VSN location in case of external
RAID
VSN location in case of internal
RAID