ATTO Technology FastStream SC 5700 - Manual (Page 18)

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ATTO Technology Inc. FastStream SC Installation and Operation Manual
4.0 Configure Storage into RAID Groups
The ATTO FastStream allows configuration of storage into DVRAID, JBOD, RAID Level 0, 1, 1+0, 4 or 5 for the
FastStream SC 5300 and 5700, plus RAID Level 6 for the FastStream SC 5500, with the ability to create multiple
partitions.
RAID is a storage configuration which uses multiple
drives to increase capacity, performance and/or
reliability. The FastStream can set up an application-
ready RAID configuration automatically, you may
custom design a RAID configuration, or you may
combine a custom and an automatic configuration.
The FastStream uses all available drives when you
select
Quick Digital Video, General Digital Video,
Audio, General IT or Database. Available drives
include those which are on-line and not currently
configured for RAID.
If you wish to have more than one type of RAID group
in your system, you have several options:
• Set up a customized RAID group (refer to
Creating a custom setup on page 16), then
return to the main menu and select a particular
application to use the remainder of your
attached storage.
• Attach only the storage you want using an
automated setup (refer to Selecting an
application ), then attach more storage and use
either the custom or specific user processes
outlined in this chapter
• Set up storage now using any of the processes
in this chapter, then modify or add to storage
using the procedures listed in Modify Storage on
page 31.
CAUTION CAUTION
Before creating any RAID group you
should initialize and verify the drives you
want in the RAID group. Refer to
Ensure
Drive Integrity on page 11.
RAID improves data accessibility and
reliability during normal operations,
however, you still need a good backup
strategy for long-term protection of data.
When you have created RAID groups, you may use,
monitor and modify the storage as needed. Refer to
Modify System Values on page 19, Manage ATTO
Devices, Configurations on page 37, Monitor
Storage, Configurations on page 21 and Modify
Storage on page 31.
Features you may choose
Depending on the application you choose, the number
of drives you choose and several other factors, you
may have other choices to customize your FastStream
to your particular needs.
Some features are customized by you only if you use
the custom setup. Refer to
Creating a custom setup
on page 16.
Auto-Rebuild
When Auto-Rebuild is enabled and an existing RAID
group member becomes faulted, the appliance
initiates a rebuild using an available unallocated drive.
If no drives are available, the rebuild is initiated only
after you replace the faulted drive and initiate a system
scan to discover the drive. Hot Spares will be used
first, regardless of the Auto-Rebuild setting.
Various outcomes are available when Auto-Rebuild is
enabled...
• And an existing RAID group member becomes
faulted or unavailable, such as when a drive is
pulled out from an array, the appliance initiates
a rebuild using an available unallocated drive.
• Or if an appliance boots up with drives missing
or faulted, the FastStream tries to switch them
out automatically.
• Exception: FastStream SC 5300 requires a
system scan using the CLI command
BlockDevScan before the drive is known to be
faulted or unavailable unless data is running to
the drive, in which case the RAID member
becomes faulted and is swapped with a
replacement.