Chapter XVIII Cache Setting
18.1
Cache setting notes
1.
During read operation, if there’s cache in data requested by the host, storage will not
access hard disk, but send cache 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.
18.3
Modify volume cache setting
1. On Setup page in EMW enterprise management window click Manage a Storage Array, the
Select Storage Array dialogue appears.
2. Select a storage array to manage, click OK, a corresponding AMW array management
window appears.
3. Select Volume>>Change>>Cache Settings, a Change Cache Settings dialogue appears.
4. To enable read operation to use cache, select Enable read caching.
5. To enable write operation to use cache, select Enable write caching.
6. If select Enable write caching, the following 2 selection boxes will appear:
Enable write caching without batteries – When controller battery discharge finishes or
incomplete battery charge or there’s no battery, data write caching is enabled.
Enable write caching with mirroring – Memories of two redundant controllers are
mirrored to each other.
7. Select Dynamic cache read prefetch to enable copying other data during data copy.
8. Click OK.
Summary of Contents for AS500H
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