Acer SmartRAID V Bedienungsanleitung PDF herunterladen (Seite 159)

6-47

Storage Manager

If cache hits are low, adding more cache RAM can also increase the hit

count. Systems with a large number of disk writes also derive significant

performance benefits from the controller cache.

For RAID 0 and RAID 5 arrays, the default stripe size is set for optimal

performance in most environments. However, some specific environments

can benefit from smaller or larger stripes. For example, when a RAID 5

write operation accesses all drives there will be a large number of stripe

crossings. By using a larger stripe size, the RAID 5 parity data can be

generated more efficiently. This results in better write performance.

However, if the write crosses one or more stripes but does not involve all of

the drives, the performance will be less efficient with the larger stripe size.

You should choose the stripe size relative to both the I/O segment size and

the number of drives in the array, so that most I/O operations either:

• Do not cross stripes and involve only a single drive

• Cross many stripes and involve all the drives in the array.

1 2 ... 154 155 156 157 158 159 160 161 162 163 164 ... 255 256

Keine Kommentare

Acer SmartRAID V Bedienungsanleitung Seite 159