NETGEAR ReadyNAS 2100 - Manual (Page 90)

ReadyNAS 2100 User Manual
5-2 Optimizing Performance and Maintaining the System
v1.1, June 2009
• Select the Disable journaling only if the NAS has UPS protection. Without battery backup,
there is a small chance that parity written to a disk in a RAID set might become out of sync
with the data disks if a power failure suddenly occurs, possibly causing incorrect data to be
recovered if one disk fails. Without full data journaling, disk write performance increases
substantially.
• Select Enable disk write cache if you want to allow disk write requests to be acknowledged
by the disk before data is written out to the platter. This can give a big boost to write
performance, with a drawback that there is a slight chance that unwritten data in the write
cache will be lost in the event of a power failure.
• Select Disable journaling if you understand the consequences of this action, and you do not
mind a long file system check (only after unexpected power failures). File system journaling
allows disk checks of only a few seconds verses possibly an hour or longer without journaling.
Disabling journaling improves disk write performance slightly.
• The Optimize for OS X option provides the best performance in Mac OS X environments
when connected to the ReadyNAS 2100 through the SMB/CIFS protocol. This option,
however, introduces compatibility issues with Windows NT 4.0; do not enable this option if
this device will be accessed by Windows NT 4.0 clients.
• The Enable fast CIFS writes option speeds write performance by enabling aggressive write-
back caching over CIFS. Do not enable this option in multi-user application environments
such as Quick Books where synchronized writes are necessary to keep files in sync.
• The Enable fast USB disk writes option speeds up USB write access by accessing the USB
device in asynchronous mode. If you enable this option, do not remove the USB device
without properly dismounting it. Failure to do so can compromise data integrity on the device.
Adding a UPS
Adding a UPS to the NAS is an easy way to protect against power failures. Simply connect the
ReadyNAS power cable to the UPS, and connect the UPS USB monitoring cable between the UPS
and the ReadyNAS. The UPS is detected automatically and shows up in the Status bar. Move the
mouse pointer over the status light to display device information, or click a status light to display
the status in more detail. You can move the mouse pointer over the UPS LED icon to display the
current UPS information and battery life.
Figure 5-2