NetApp

Setting the cache mode
The cache mode determines how storage reads and writes are serviced from cache. You set the cache mode on both the disk and the virtual machine on which the disk is configured.
About this task 
Three cache modes are available:
In Write Around mode, read data is written to cache and read requests are serviced from cache. Write data is written to the storage system but not to cache.
In Write Thru mode (the default), read data is written to cache and read requests are serviced from cache. Write data is written to the storage system, then to cache. Write Thru is the optimal setting for Flash Accel when the product is used for read-intensive applications.
In Pass Thru mode, no data is cached and no I/O is serviced from cache. The cache is "kept warm" for virtual disks. It remains populated with data from previous application read and write activity.
You can set cache modes differently for virtual machines and disks, and for disks on the same virtual machine. The following logic determines the active cache mode when the setting differs on a virtual machine and disks:
So:
Step 
1.
From the home page of the Flash Accel Management Console, click the wrench icon for the VM or disk on which you want to set the cache mode and select Cache Mode > mode.
From the home page of the Flash Accel Management Console, select each VM or disk on which you want to set the cache mode and click Cache Mode in the Bulk Actions area of the home page. In the cache mode dialog box, select the radio button for the cache mode and click Submit.
From the home page of the Flash Accel Management Console, select each VM and disk on which you want to set the cache mode and click Cache State in the Bulk Actions area of the home page. In the cache mode dialog box, select the radio button for the cache mode and click Submit.
Click the wrench icon for a VM and select Advanced to enable or disable caching, set the cache mode, and enable or disable cache metrics in the same step.
Result 
The Cache Mode field for the virtual machines and disks is set to the specified mode.
Parent Topic: Setting the cache mode for virtual machines and disks


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