Seagate ST39103LC Uživatelská příručka stáhnout pdf (Strana 25)

Chapter 3. SVA Path Operation 15

equation must be less than the percentage value of

balance-threshold to be considered balanced.

• reassignment-threshold percentage

This parameter determines whether or not a reassignment

will be considered worthwhile.

•

measurement-interval time

This parameter accepts an positive integer value with a

suffix of "s" (seconds), "m" (minutes), or "h" (hours). A

reasonable minimum value will be based on the CPU load

presented to the system by the algorithm and the maximum

value is based on the amount of time that can pass before the

driver's internal counters overflow.

•

reassignment-limit number

This parameter specifies the maximum number of devices

that should be moved in one pass of the algorithm. The

default value is equal to or one half of the FDevs. If the path

group includes one or more multi-FDev LUNs, each FDev is

considered a separate device.

•

read-overhead µs-per-cmd µs-per-sector

This parameter is used to specify how bus connect time

overhead is estimated for read commands. The first value

specifies the number of microseconds estimated for read

command overhead, while the second is an estimate of

connect time required for each 512 bytes of data requested.

For each read operation, the sum of the command overhead

and the product of the transfer length and the per-sector

overhead is added to a counter that is used to estimate overall

bus utilization on a per-FDev and per-channel basis.

•

write-overhead µs-per-cmd µs-per-sector

This parameter is analogous to the read-overhead statement.

Sample values for these two statements are:

read-overhead 1000 120

write-overhead 1000 160

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 67 68

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Seagate ST39103LC Uživatelská příručka Strana 25