User manual

Chapter 9: Support
223
Why can a RAID 1 logical drive on VTrak consist of only two disk drives?
On VTrak, RAID 1 logical drives work in matched pairs. But you are not
limited to just one RAID 1 logical drive. VTrak supports up to 7 RAID 1
logical drives, using up to 14 disk drives.
See page 189 for more information on the number of disk drives you can use
for each RAID level.
Are logical drives on VTrak limited to 2.199 terabytes?
No. The 2.199 TB logical drive size limit does not apply to VTrak. Check
whether your operating system supports logical drives over 2.199 TB.
If logical drives can exceed 2.199 TB on VTrak, why can’t I expand my
logical drive beyond 2.199 TB?
The problem is a limitation of the Operating System and the number and size
of LBA sectors it can manage. See page 203 for more information and your
options for logical drive expansion.
The CLU, WebPAM PRO and VTrak documentation use the term “logical
drive” where earlier Promise products use the term “array.” Why did this
change happen?
Technically, logical drive is the correct term. Array usually refers to a group of
disk drives not arranged under RAID or to the RAID subsystem. Promise
adjusted its use of terms to more closely match the industry.
I have two UltraTraks and use WebPAM to monitor them. Can I use my
existing WebPAM setup to monitor the VTraks also?
No. Install WebPAM PRO from the VTrak Software CD.
The VTrak has no LCD panel. How can I set it up and create logical drives?
There are two ways to set up VTrak and create logical drives, using
WebPAM PRO, on page 103 or the Command Line Utility, on page 144.
Why do the Rebuild, Synchronize, Expand and Convert operations take so
long compared to moving data?
When data is moved, the operation consists of reading, writing and checking
one or more files. Rebuild, Synchronize, Expand and Convert involve
reading, writing and checking all the logical block addresses or individual
data blocks on each disk drive. Plus, your logical drive remains available
while these operations take place. These added requirements increase
complexity and take more time.