User`s guide

Appendix B : Console User Interface
93
Volume Information, Continued
Name Description
Degraded This status means that the Volume has been compromised and needs to
be rebuilt. A Degraded status can indicate a hard disk drive failure or
that the data on the Volume is corrupt.
Initializing This status means that the hard disk drive was just inserted on the bus
and is in the process of being recognized by the NAS server.
Note: The Initializing Status is available on SCSI backplanes and
ATA backplanes that support hot plugging.
Formatting This status means that the Volume is being formatted by the StorTrends
NAS software.
Status, Continued
Rebuilding This status means that the Volume is being regenerated.
Name This field displays the name of the Volume. The name of the Volume is represented as the
word Volume followed by a numeric designation such as, 0,1,2,3,4, and so on.
Capacity This field displays the total size of the Volume.
Available This field displays the remaining disk space on the Volume.
RAID Level This field displays the level of RAID used on the Volume. See the Volume section in
Chapter Three, Configuring Your NAS Server for more information on how to assign a
RAID Level during the creation of your Volume. See Appendix C, RAID for more
information about the supported RAID Levels.
Stripe Size This field displays the type of striping used on the Volume. See the Volume section in
Chapter Three, Configuring Your NAS Server for more information on how to assign a
Stripe Size during the creation of your Volume.
Creation Date This field displays the date the Volume was made.
Disk(s) Involved This field displays the physical hard disk drives used in the Volume. All hard disk drives
involved in the same Volume will drop down in capacity to match the lowest capacity
hard disk drive. For example, if you are mirroring a 40 GB hard disk drive with a 60 GB
hard disk drive, the 60 GB hard disk drive will loose 20 GB. In conclusion, You will
only have a 40 GB Volume.
To go back to main menu, press the <ENTER> key.
Note: Most hard disk manufacturers follow the metric conventions of Kilobyte, Megabyte, and
Gigabytes for specifying the drive capacity on their label and specifications (for example,
1000 B =1 KB, 1000 KB=1 MB and 1000 MB=1 GB) instead of the 1024 convention.
For example, given a manufacturer-specified 18.4 GB hard disk, the actual capacity
reported by the disk is 17930455KB = 17930455 *1024 = 18360785920 Bytes. This, if
converted to metric convention, results in the specified 18.36 GB capacity rounded up.
Thus, the actual capacity of the 18.4 GB drive is displayed on this page as 17.1 GB.
Using the RAID level five with six hard disk drives yields a raw capacity of 17930455 K
times five = 89652275 K. But each hard disk drive uses some space for the RAID
configuration resulting in 89651520 K. This is an overhead of approximately 150 K per
hard disk drive.
During file system formatting, the superblock and the inodes tree use a big chunk
of space. The bigger the hard disk drive size, the more inodes are created. One inode
is created for every 4096 Bytes. Thus resulting in a usable size of 79942087 K.
Quotas are stored in two files called quota.user and quota.group. They use some
of the useable space.
Thus resulting in a final available space of 79942039 K = 76.24 G and the overall
overhead (wastage) is approximately ten percent.