Determining Drive And Sled Designations; Physical Numbering; Logical Numbering - ATTO Technology Diamond Storage Array S-Class Installation And Operating Manual

4.0 Determining Drive and Sled Designations

The Diamond Storage Array has been designed with 12 sleds, each holding two drives. The easiest way
to configure a 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.
We recommend that all sled slots are filled
contiguously, starting with the first slot next to the
management card.
When configuring a Diamond 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 77 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
1 2
Disk 2 Disk 2
LUN 13 LUN 14
Disk 1 Disk 1
LUN 1 LUN 2
Management Card
15
ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
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
logical disk or Logical Unit (LUN). Each LUN 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.

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.

Logical numbering

Logical numbering depends on
the RAID configuration of the
storage array. S Class firmware
includes RAID Level 0, RAID
Level 1, RAID Level 10 and
RAID Level 5 capability. A
variety of configurations may
be selected using the
QuickRAID0 command. The
default configuration is
QuickRAID0 0 or JBOD (Just
a Bunch of Disks).
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