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Chapter XVIII Cache Setting
18.1 Cache setting notes
1. During read operation, if the data requested by the host is in the cache, storage will not
access hard disk, but send cache data to the host.
2. During write operation, data will be written to cache, and data will then be written to hard
disk when cache data reaches a certain percentage.
3. When a controller fails, cache data in this controller will lose.
4. In order to protect data in cache, user could diminish the percentage triggering writing
cache to hard disk, but during frequent read-write, this will reduce performance.
5. When cache mirroring function is enabled, if a controller fails, another controller will
take over, while this controller will use mirrored cache to continue read-write operation.
18.2 Modify cache setting
1. On Setup page in EMW enterprise management window click Manage a Storage Array, a
Select Storage Array dialogue appears.
2. Select a storage array to manage, click OK, a corresponding AMW array management
window appears.
3. Select Storage Array>>Change>>Cache Settings, a Change Cache Settings dialogue
appears.
4. Input a numerical value to trigger cache flush, and a numerical value to cease cache flush.
5. Select the size of cache block, and click OK.
Figure 18-1