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data before it is written to the drives and achieves faster speeds by using memory con-‐
nected directly to the motherboard. Although a large cache will generally lead to better
performance, it is not recommended to use up all the RAM memory for drive caching, as a
minimum of 2GB is required for running the Operating System and managing other tasks.
8GB is a good size for the QOS 8-‐bay RAID system.
RAID Level determines if the data will be striped as RAID0 or RAID6. RAID0 stripes data
across all eight drives, but since there is no built-‐in redundancy a single drive failure will
prevent access to all the data permanently. RAID6 takes up the capacity of two drives to
write parity – data that contains restore information -‐ to all drives. RAID6 can see two
drives completely fail without losing any data. RAID6 will help protect against errors as
well as failures and is the recommended configuration for mission critical data manage-‐
ment work. There isn’t a great deal of performance difference between the two levels.
First Slot and Device Count allow you to define which drives will be allocated to the new
RAID set. Most of the time it is best to start at drive 0 and use up all of the QOS 8-‐Bay’s
eight drives as a single RAID set. On the far right, the RAID status is a quick way to tell if
there are any errors on the RAID including a failed drive restore operation. If there aren’t
any serious problems the RAID will show as Online.
After the RAID has been created you can click the ‘Details’ button to view and change its
parameters.
Warning:
In the Raid Details page and subsequent pages, it is possible to irrecoverably
delete the RAID. Do not do anything to an existing RAID without being assured it will not
compromise your data (especially Scan/See Performance Stats).
The RAID Details panel at the bottom is for viewing the status of the RAID. If a drive has
failed and a replacement drive has been inserted, the drive will show its reconstruction
QOS 8-Bay User Manual
QOS Server is a subsidary of Ocean Tides Productions Ltd. © Copyright 2013
