Jbod: Just A Bunch Of Disks - ATTO Technology FastStream VT 5700 Installation And Operation Manual

Appendix B
The ATTO FastStream VT 5700 provides instant hardware data protection and intelligence to existing storage
independent of the storage type.
The FastStream VT appears to hosts as a tape library,
allowing ISV packages to issue a set of tape library
commands to perform backup and restore operations
to the FastStream.
For every Virtual Tape Library created on the
FastStream VT, an underlying RAID group is created
from the selected drives to provide the physical
storage medium for the Virtual Tape cartridges.
CAUTION CAUTION
While RAID improves data accessibility
and reliability during normal operations,
you still need a good backup strategy for
long-term protection of your data.
A RAID group is a virtual, independent single drive
whose data is written to physical drives according to a

JBOD: Just a Bunch of Disks

JBOD configuration allows many individual drives to
be available for normal storage operations with no
special data protection by combining several drives
into one large drive. A special case of a RAID group,
multiple physical drives are assigned to a JBOD RAID
iii
ATTO Technology Inc. FastStream SC Installation and Operation Manual
Design RAID Groups
Disk 1 Disk 2
Data 1 Data 5
Data 2 Data 6
Data 3 Data 7
Data 4 Data 8
RAID algorithm. The ATTO FastStream VT 5700
supports JBOD and RAID levels 0, 1, 1+ 0 and 5.
In general, the process begins with individual drives
called block devices.
Note
If a drive has corrupt or outdated configuration
data, that drive cannot be assigned to any
RAID group. Ensure all drives are configured
properly. Refer to
page 7 and Cleaning RAID configuration
information on page 35.
To set up RAID groups refer to
Tape on page 9.
While RAID improves data accessibility and reliability
during normal operations, you still need a good
backup strategy for long-term protection of your data.
group and their storage areas appear as a single
spanned area of storage.
The ATTO FastStream supports 1 to 32 drives per
JBOD-configured RAID group.
Disk 3
Data 9
Data 10
Data 11
Data 12
Ensure Drive Integrity on
Configure Virtual