Determining Drive And Sled Designations; Physical Numbering - ATTO Technology Diamond Storage Array V-Class 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
page 75 for information about updating the array
firmware.)
refers to the physical drives in the array,
Physical
the hardware that actually exists in a physical
sense.
refers to what the host
Logical (or virtual)
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
In RAID configurations, for
physical disks.
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
1 2
Disk 2 Disk 2
LUN 13 LUN 14
Disk 1 Disk 1
LUN 1 LUN 2
Management Card
15
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on
Updating Firmware
Rack Mount Drive Sleds
3 4 5 6
LUN 17
Disk 2 Disk 2 Disk 2 Disk 2
LUN 16 LUN 20
LUN 15 LUN 16 LUN 17 LUN 18
Disk 1 Disk 1 Disk 1 Disk 1
LUN 3 LUN 4 LUN 5 LUN 6
(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.
7 8 9 10
Disk 2 Disk 2 Disk 2 Disk 2
LUN 19
LUN 19 LUN 20 LUN 21 LUN 22
Disk 1 Disk 1 Disk 1 Disk 1
LUN 7 LUN 8 LUN 9 LUN 10
Management card
Drive 1
LUN 1
Drive 1
LUN 2
Drive 1
LUN 3
Drive 1
LUN 4
Drive 1
LUN 5
Drive 1
LUN 6
Drive 1
Drive 1
LUN 7
LUN 6
Drive 1
LUN 8
11 12
Drive 1
LUN 9
Disk 2 Disk 2
Drive 1
LUN 23 LUN 24
LUN 10
Drive 1
Disk 1 Disk 1
LUN 11
LUN 11 LUN 12
Drive 1
LUN 12
Drive 2
LUN 13
Drive 2
LUN 14
Drive 2
LUN 15
Drive 2
LUN 16
Drive 2
LUN 17
Drive 2
LUN 18
Drive 2 Drive 1
LUN 19 LUN 12
Drive 2
LUN 20
Drive 2
LUN 21
Drive 2
LUN 22
Drive 2
LUN 23
Drive 2
LUN 24