DataDirect Networks S2A9550, User Manual, Page: 60 / 118

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D a t a D i r e c t N e t w o r k s S 2 A 9 5 5 0 U s e r G u i d e
M a n a g i n g t h e S 2 A 9 5 5 0
The system will halt all I/O requests, delete all the LUNs and restore all the parameters back to their
default values. This is a
destructive operation which will delete all the data stored in the system.
The system will ask if you want to erase all the configuration information stored on the disks. This
will prevent the system from retrieving the backup copies of the configuration settings from the disks
after the system is restarted. After the default settings have been loaded, the system will ask if you
want to begin reconfiguration by scanning for the disks. New LUNs can be created after the disks
have been added back to the system.
3.2.9 LUN Management
The S2A9550 creates centrally-managed and vendor-independent storage pooling. It enables
different types of storage to be aggregated into a single logical storage resource from which virtual
volumes (LUNs) can be served up to multi-vendor host computers. The networked storage pools will
provide the framework to manage the growth in storage demand from web-based applications,
database growth, network data-intensive applications, and disaster tolerance capabilities.
3.2.9.1 Configuring the Storage Array
The storage array may consist of up to 125 tiers, depending on individual disk enclosure’s AL_PA
numbering scheme. The tiers can be combined, used individually, or split into multiple LUNs. A LUN
can be as small as part of a tier or as big as the whole system. LUNs can be shared or dedicated to
individual users. Up to 128 LUNs are supported in total. Each LUN can also be subdivided into up to
64 smaller equally-sized LUN segments, giving a total of 8192 LUN segments. The LUN segments of
a LUN are managed together and share the same characteristics. In couplet configuration, LUNs are
“owned” by the S2A9550 via which they are created.
You can add and remove LUNs without affecting system operations. Use the LUN command to
display the current Logical Unit Status
(Figure 3-23)
.
NOTE : In dual mode, LUNs will be “owned” by the S2A9550 unit via which they are created. Hosts will
only see the LUNs on the S2A9550 that they are connected to, unless cache coherency is used.
3.2.9.2 Creating a LUN
There are two types of LUNs you may add based upon the operating systems: one which handles 32
bit addressing and one that handles 64 bit addressing.
To add a 32 bit LUN, type:
LUN ADD=x
<Enter>
where “x” is the Logical Unit Number <0..127>.
This command will delete all LUN configuration and data
unconditionally. Do not issue this command without
guidance from DataDirect Networks Technical Support.
!
Warning
Figure 3-23 Logical Unit Status Screen
Logical Unit Status
Block
Size
LUN Owner Tier List Capacity
(Mbytes)
512
-------------------------------------------------------------------------
10002 Ready [GHS] 0
System Capacity 277810 Mbytes, 237802 Mbytes available.
S2A [1]: lun
Status
1 1
512 10002 Ready 1 1 2
512 10002 Ready 2 1 3
512 10002 Format 14% 3 1 4
Tiers
1
1
1
1
Label
vol1
vol2
vol3
vol4