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Appendix C: Frequently Asked Questions
This section lists frequently asked questions involving pre-installation, drive
issues, installation, and post-installation.
Q. What kind of hard drives can I use for an UltraTrak array?
A. You can use any Ultra ATA/133/100/66/33 hard drive(s) to create arrays on
the UltraTrak. You should use matching drives for multiple-drive arrays to
maximize capacity usage as well as performance. (NOTE: Ultra ATA/133
hard drives can be used in the UltraTrak units. However, they will run at
Ultra ATA/100 speed)
Q. Can I add a drive to an UltraTrak RAID array via hot-swap and
dynamically adjust the array size/configuration?
A. No. The UltraTrak does not support dynamically adjustable RAID
size/configurations.
Q. Can I take a set of drives that make up an array created on one
UltraTrak and move it to another UltraTrak?
A. Yes. All UltraTrak’s read the arrays the same way. Once the drives are all
connected, you must restart the system for it to recognize the newly-inserted
array configuration.
Q. Can I take a drive used in an UltraTrak array and access it directly with
a different controller, such as the one integrated on the motherboard?
A. Yes, but only under certain configurations. The following array
configurations will allow the drive(s) to be accessed individually on another
controller: mirror (RAID 1), or single drive striped (RAID 0). Multiple drives
striped will not work.
Q. How can I be sure that write-back cache has flushed before I reboot
after partitioning and formatting an array?
A. A cache flush is always triggered immediately following any write from the
int 13h BIOS. This level of array support is what FDISK and FORMAT use to
access the drive from MSDOS. With no delay in the write operation, there is
no cached data waiting to be written. If you are running from Windows
NT/2000 or other operating systems, as usual, make sure to shut down
Windows properly so that the operating system can trigger and flush the
cache as necessary. NOTE: powering off before a proper shutdown is
complete may result in the loss of unwritten data in the cache, possibly
causing problems in a subsequent boot or access to the data that was
unwritten.
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