Apc SGI 15000 RAID User Manual Page 81

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Controller Management
007-5510-002 67
TIER DELAY=x is used to set the system rebuild/format delay. This value is in 100 millisecond
increments. The range is 0 to 1000. The default setting is 30 milliseconds (3 seconds).
The REBUILD EXTENT parameter determines how much data to rebuild or format at one time. A small
EXTENT value will slow down the rebuild and format operations so they will not affect the performance
of the system. Increasing the EXTENT value will allow more data to be rebuilt in a single pass. The
recommended setting is to use the default value of 32 MBytes (MBs) and only adjust DELAY to match
your user load.
TIER EXTENT=X (where X is a value from 1 to 128) sets the system rebuild/format extent in MBs. The
range is 1 to 128 MBs. Default is 32MBs.
3.3.4.1 Background LUN Verify Operations
LUN VERIFY displays the current setting for background verify on all LUNs.
LUN VERIFY=X turns on background verify for LUN X, where X is a Logical Unit <0..1023>.
LUN VERIFY=ON|OFF prompts you for a list of LUNs where the background verify will be turned either
ON or OFF.
LUN VERIFY=ON will both turn on the background verify for the specified LUN(s), as well as start up
the verify operation(s).
LUN VERIFY=OFF only turns off the Background Verify setting for the specified LUN(s). Therefore,
any Verifys that are already active on the LUN(s) will not terminate until after the completion of that
Verify's current iteration. To stop all verify operations immediately, use the LUN STOP command.
NOTE :
It is recommended that you run LUN VERIFY in continuous mode, since it can help
increase disk reliability.
LUN DELAY= X sets the system Verify Delay value to X, where x is a value from 0 to 1000. The Verify
Delay value determines how long a verify operation will pause after it reaches the verify extent. This
parameter slows down the verify operation so that it will not affect the performance of the system (except
in the case where X is set to 0, as described below).
DELAY=X will remove all delays so that the verify operation will go as fast as possible; however, this
will slow down the performance of the system. This value is in 100 millisecond increments. The range
for X is 0 to 1000. Default is 40.
LUN EXTENT=X sets the system verify extent value X in Mbytes. The verify extent determines how
much data can be verified before the verify operation must pause. This parameter slows down the verify
operation so that it will not affect the performance of the system. Increasing the extent value will allow
more data to be verified in a single pass. The range for X is 1 to 128 MBs. Default is 32 MBs.
3.3.4.2 Background TIER Verify Operations
TIER VERIFY verifies LUNs on a tier by tier basis. TIER VERIFY differs from LUN VERIFY in that the
number of simultaneous Tier Verifys is limited to a value that is set by TIER MAXVERIFIES (default =
2) parameter. The valid range is 1 to 16. If a tier is marked for continuous verification, once the
verification completes, the next sequential tier marked for verification, not presently being verified, will
start.
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