Diamond Storage Array Installation, Operations, Maintenance Manual

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ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
6.3 RAID Level 1
The Diamond Storage Array can be set up into RAID Level 1 (mirrored) groups to provide greater
reliability by simultaneously writing data to two sleds. Each sled partnered through QuickRAID1, a CLI
command, has the same data as its partner.
CAUTIONCAUTION
Selecting RAID configuration causes all
previous drive data on the Diamond
Storage Array to be erased. Make sure all
information is backed up before setting up
RAID groups.
The configuration of RAID Level 1 performs the
same operations on two partnered sleds at the
same time, providing an automatic backup of
data. The operating system sees the two sleds as
one virtual sled with its own LUN (Logical Unit
Number).
The
QuickRAID1 command allows the array
to be set into mirrored drives. The
command first spans two drives on a sled
together, then partners two sleds to be a
RAID Level 1 group designated by a LUN
(logical unit number).
To set up RAID Level 1 groups
1 Connect to Diamond Storage Array
services via the RS-232 port or the
optional Ethernet management services card
(refer to
Accessing the Array on page 17). You
should now be in CLI.
2 Continue with the CLI or access the
RAID page
of the ExpressNAV interface (refer to
ATTO
ExpressNAV: Browser-based Interface
on page 25).
Note
Because the ExpressNAV pages take you
through this process easily, the following
instructions are based on the CLI commands.
Use these instructions as a guide in
ExpressNAV.
3 QuickRAID1 has no options: the command sets
up each sled and its mirror image. Type set
QuickRAID1. The Ready* displays.
4 The array will update NVRAM. The Ready*
displays.
5Type SaveConfiguration.
6Type FirmwareRestart to reboot the array.
7 Reboot the host computer.
8 In a fully populated array, your operating
system displays six drives.
Note
In a less than fully populated array, if both
partners of a LUN are missing, the LUN will not
exist. If only one partner is missing, the LUN
will exist, but it will be degraded (unprotected).
See Exhibit 6.3-2 to determine which LUNs
would be affected.
Exhibit 6.3-1 Drive sleds, LUNs and mirror partners in
a RAID Level 1 configuration.
To remove RAID groups
1 Connect to Diamond Storage Array services via
the RS-232 port or the optional Ethernet
management services card (refer to
Accessing
the Array
on page 17). You should now be in
CLI.
2 Continue with the CLI or access the RAID page
of the ExpressNAV interface (refer to
ATTO
ExpressNAV: Browser-based Interface
on page 25).
3Type set QuickRAID0 0. This will configure the
array in JBOD mode.
4 The array will update NVRAM. The Ready*
displays.
5Type SaveConfiguration.
6Type FirmwareRestart to reboot the array.
7 Reboot the host computer.
8Type DriveInfo when in CLI or access the
Storage Management page of the
RAID 1 in a fully populated Diamond Storage Array: 6 sleds, each partnered with
another sled, with each partner a mirror image of the other
each sled a mirror image of its
partner
2 spanned drives per sled
6 virtual devices