Filter
Top Products
15
ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
3.3 Determining Drive and Sled Designations
The Diamond Storage Array has been designed with 12 sleds, each holding two drives. The easiest way
to configure an array is to use all the drives on all the sleds. The firmware uses a numbering system to
determine which drives and sleds it is affecting.
All sled slots should be filled contiguously,
starting with the first slot next to the management
card.
When configuring a array with fewer than 12
drive sleds, you must consider several factors:
RAID level, number of physical drives/sleds and
the end configuration you are trying to achieve.
Review the information about each configuration
to determine how each configuration would be
affected by using fewer sleds.
Numbering conventions
The Diamond Storage Array with firmware
version 3.1 and newer uses a unique numbering
convention to orient its drives and sleds to the
controlling firmware. Older versions do not use
this convention. (refer to
Updating Firmware
on
page 75 for information about updating the array
firmware.)
Physical
refers to the physical drives in the array,
the hardware that actually exists in a physical
sense.
Logical (or virtual)
refers to what the host
operating system recognizes as an entity. Two
physical drives may be seen as one logical drive
by the operating system.
Logical disks do not always map one-to-one with
physical disks.
In RAID configurations, for
example, several physical disk drives (or portions
of several physical drives) are grouped into a
logical disk, call a RAID Group or a Logical Unit
(LUN). Each RAID group is broken into logical
blocks of 512 bytes each, numbered 0 through n
(the Logical Block Number or LBN). A 100 GB
LUN has approximately 200,000,000 logical
blocks.
A RAID group is also referred to as a Virtual
Drive.
A LUN is associated with a RAID group or
Virtual Drive unless you are using partitions. If
you have partitions, a LUN is associated with
each partition. A RAID Group or Virtual Drive
may then have multiple partitions or LUNs.
Physical numbering
The Diamond RAID Storage Array contains
• Up to 24 physical disk drives
• Two drives mounted on 12
physical drive sleds
• Sleds are numbered 1-12,
starting at the top (floor units)
or the left (rackmount units).
• Each sled is connected to its
own internal ATA bus with
two disk drives, numbered 1
and 2.
• Two green LEDs, labeled
Drive 1 and Drive 2, indicate
activity for the two drives.
They remain solidly lighted
when there is no activity.
1 2 3 4 5 6 7 8 9 10 11 12
Rack Mount Drive Sleds
Management Card
Disk 2
LUN 13
Disk 2
LUN 14
Disk 2
LUN 15
LUN 16
LUN 17
Disk 2
LUN 18
LUN 19
LUN 20
Disk 2
LUN 21
Disk 2
LUN 22
Disk 2
LUN 23
Disk 2
LUN 24
Disk 1
LUN 12
Disk 1
LUN 11
Disk 1
LUN 10
Disk 1
LUN 9
Disk 1
LUN 8
Disk 1
LUN 6
Disk 1
LUN 4
Disk 1
LUN 3
Disk 1
LUN 2
Disk 1
LUN 1
Disk 1
LUN 5
Disk 1
LUN 7
Disk 2
LUN 19
Disk 2
LUN 20
Disk 2
LUN 17
Disk 2
LUN 16
1 2 3 4 5 6 7 8 9 10 11 12
Floor Model Drive Sleds
Drive 2
LUN 13
Drive 2
LUN 14
Drive 2
LUN 15
LUN 17
Drive 2
LUN 18
LUN 19
LUN 20
Drive 2
LUN 21
Drive 2
LUN 22
Drive 2
LUN 23
Drive 2
LUN 24
Drive 1
LUN 12
Drive 1
LUN 11
Drive 1
LUN 10
Drive 1
LUN 9
Drive 1
LUN 8
Drive 1
LUN 6
Drive 1
LUN 4
Drive 1
LUN 3
Drive 1
LUN 2
Drive 1
LUN 1
Drive 1
LUN 5
Drive 1
LUN 7
Drive 2
LUN 19
Drive 2
LUN 20
Drive 2
LUN 17
Drive 2
LUN 16
Mana
g
ement card
Drive 1
LUN 6
Drive 1
LUN 12