Planet NAS-5400, User Manual

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Turn on disk write cache support
System administrator can enable or disable the hard disk write cache here.
This setup will take effect only if the server hard disk supports cache memory. If the hard disk
write cache is enabled, the system read/write performance will improve, but it may result in data
loss if any unanticipated power failure occurs. If the system utilizes UPS, then we suggest that
you enable this selection. To check if the hard disk supports the cache memory, contact your hard
disk dealer.
Turn on RAID 5 cache support
A RAID 5 volume requires more frequent data requests to compute parity, and to improve the I/O
efficiency, the NAS server supports RAID 5 device-layer cache so data can be stored in memory
temporarily for faster access.
However, it is suggested UPS is accompanied with the NAS server when this option is turned on
to avoid data loss when unanticipated power failure occurs.