User`s guide

XStack Storage User’s Guide 117
5.5 Performing Cache Activities
The XStack Storage unit contains cache memory for storing I/O activity and data. The File menu
provides options for setting the cache mode and flushing cache contents.
5.5.1 Setting Cache Mode
The XStack Storage unit is capable of caching write operations. Write-back caching saves the
system from performing many unnecessary write cycles to the system RAM, which can lead to
noticeably faster execution. However, when write-back caching is used, writes to cached
memory locations are only placed in cache and the data is not written to the disks until the
cache is flushed. When caching is disabled, all read and write operations directly access the
physical disks. By default, write-back cache mode is always enabled and cannot be disabled.