39
Modifying RAID Group mapping
You may change the LUNs of drives manually or let the
ExpressNAV Storage Manager map drives for you.
1
Follow the instructions in
page 37 and click on the
RAID Groups
arrow
from the
Select User Process
box.
2
Click on the
Modify Mapping
button.
3
Click on
Next
.
4
Select the RAID Group you wish to change
from the drop down box.
5
Select the method you wish to use to map the
partitions. Refer to
• If
you
select
Auto
, all mapping for all RAID
Groups attached to this FastStream is
changed, destroying any previous mapping.
• If you do not wish to change the mapping of
your other RAID Groups, select
Manual
.
Click on any partition to map that partition to
a Port and LUN (SC 5550, 8550) or to a SAS
connector (SC 8250). For the SC 8250, the
SAS LUN will be mapped to all four PHYs in
the connector.
6
Click on
Commit
to save the new mapping.
7
A warning box may appear telling you some
mapping configurations may impair
performance. Complete the mapping change
by clicking on
Yes
. Clicking on
No
ends the
procedure without making a change.
8
The
Health and Status Monitor
page appears.
Modifying RAID Group partitions
A RAID Group may have several Terabytes of total
data capacity because of the size of the included
drives. Partitions allow you to break up large RAID
Groups into smaller, more manageable groups.
Most host systems can address only 2 TB per LUN.
Partitioning increases storage efficiency by providing
more LUNs without using lower capacity RAID
Groups.
Partitioning allows the creation of multiple logical
volumes.
1
Follow the instructions in
page 37 and click on the
RAID Groups
arrow
from the
Select User Process
box.
2
Click on the
Modify Partitioning
button.
3
Click
Next
.
4
Select the
RAID Group Name
from the drop
down menu.
5
Using the graphic and drop down boxes,
choose to either merge or split existing
partitions or to assign different values for the
partition sizes.
6
Click
Commit.
7
A warning box appears. In the warning box,
verify that you want to complete the
configuration by clicking on
Yes
. Clicking on
No
ends the procedure without making a change.
8
The
Health and Status Monitor
page appears.
Rebuilding RAID Groups
If RAID Groups become compromised in some
fashion, you must rebuild them.
If you have previously enabled Auto-Rebuild and
unallocated drives or Hot Spares are available, one of
those drives is substituted for the failed drive and a
rebuild takes place automatically.
Refer to
page 24 for information on Auto-Rebuild and to
FastStream process: adding or removing Hot
Spares
on page 40 for information on Hot Spares.
Hot Spares, if available, are used first, regardless of
the Auto-Rebuild setting.
If you have not enabled Auto-Rebuild and no Hot
Spares are available, use this procedure to rebuild the
faulted RAID Group.
1
Follow the instructions in
page 37 and click on the
RAID Groups
arrow
from the
Select User Process
box.
2
Click on the
Rebuild Group
button.
3
Click on
Next
.
4
Select the RAID Group you wish to rebuild.
5
If you have enabled RAID 6, choose to rebuild
one or two drives at the same time.
6
Follow the on-screen directions, ending by
clicking on
Commit.
7
A warning box appears. In the warning box,
verify that you want to complete the rebuild by
clicking on
Yes
. Clicking on
No
ends the
procedure without making a change.
8
The
Health and Status Monitor
page appears.
