G A L A X Y ® A U R O U R A C O N F I G U R A T I O N A N D S Y S T E M I N T E G R A T I O N G U I D E
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Section 3 Management
3.1.9
PARAM Details
The PARAM functions are for setting or viewing global array parameters. Each
row in each table except for the last row of the last table, shows a parameter
and value. Should you need to change this value, you would alter the value on
the right, then click the corresponding update button on the left. It works the
same way for changing every parameter. So here are the parameters and
what they mean/do:
Maximum Read Ahead Distance in 128k Stripes
: When you playback video
for example, you are essentially doing one large sequential read. To make
playback smoother, the array can be set to read more of the file than the
position that the client computer is currently requesting. This is called a read-
ahead cache. The cache is only selectable in 128KB increments, and the
value here is the number of 128KB blocks to use (The blocks are referred to
as stripes, because they go across all of the drives in the RAID). The default
value is 24. This allows the computer to read 3MB ahead. So, for example, if
you were playing a standard-definition video file, which plays relatively slowly
