User manual

FIBRE-to-SAS/SATA RAID SUBSYSTEM
User Manual
71
6.1.3 RAID Profile Usage
The RAID profile allows you to optimize your RAID system so that it best suites the
application for which it is to be used. The following table shows the RAID profiles that
are available and explains each option:
Profile Description
Read
Cache
Write
Cache
Stripe
Unit
Size
***
Expected
Sequential/
Random Mix
Expected
Read/
Write Mix
Workstation
/ CAD
For general
desktop
applications
Read &
Read
Ahead
On 128
70% Sequential
30% Random
70% Read
30% Write
File Server
For file
server and
network
storage
Read &
Read
Ahead
On 256
50 % Sequential
50% Random
70% Read
30% Write
Media Server
For video
and creative
content
storage
Read
Ahead
On 256
90% Sequential
10 % Random
50% Read
50% Write
Database
For
transaction
processing
Read On 64
10 % Sequential
90 % Random
90% Read
10% Write
Media Server
- No init **
For video
and creative
content
storage
Read
Ahead
On 256
90% Sequential
10 % Random
50% Read
50% Write
When a RAID is created, the profile determines the default caching parameters (which
can be changed after RAID creation) and the stripe unit size (which cannot be changed
after RAID creation).
The default profile when the system is shipped is 'File Server'.
** A RAID with a profile of 'Media Server - No init' is not initialised and is immediately
available. Small writes will incur a small penalty.
*** measured in sectors