Fujitsu Siemens Computers CentricStor V3.1D, Руководство пользователя

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U41117-J-Z125-7-76
Function bar GXCC
Erase Scratch LVs
This specifies how the data of scratch volumes is to be handled:
ENABLED Only the stub data (volume header) is to be retained.
CAUTION!
With this setting it must be assumed at all times that the data on
scratch volumes - and also on the physical volumes - will auto-
matically be deleted and consequently be irretrievably lost. This
behavior was implemented as the default in early CentricStor
versions without the option of changing it by means of configu-
ration. This is contrary to the behavior of real library services.
DISABLED No data is deleted. However, the logical volumes are displaced from the
TVC. This behavior is preset and corresponds to that of real library
services.
This affects the following operations of the Virtual Library Services:
VACS “set scratch” command
VAMU “CVA” command (change volume attribute)
VDAS Not used
VLMF Not used
VJUK Not used
Dual Save Dirty Limit (%)
Determines the maximum share which logical volumes of this LVG which are “dirty” may
be assigned in the cache file system. When this value is exceeded and the selected LVG
is connected to 2 PVGs, CentricStor will switch from dual save to single save in the
event of problems on the backend, e.g. a robot error. As soon as the LVs of this LVG
have been saved their cache is released. In this way a cache overflow is prevented. As
soon as the backend errors have been corrected the second backup is performed.
DISABLED The function is disabled, i.e. no change to single save for this LVG.
GLOBAL The “Global Dual Save Dirty Limit” setting in the ”Control Components”
menu (only service mode, ) should be used.
90, ... ,10 Value in percent as of which single save is switched to.
The default setting is GLOBAL.
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