Sun Storage 6580 Array
 
Sun Storage 2540-M2 Array
 
Sun Storage 6540 Array
 
Sun Storage 6180 Array
 
Sun Storage 2510 Array
 
Sun Storage 2540 Array
 
Sun Storage 6130 Array
 
Sun Storage 6780 Array
 
Sun Storage 2530 Array
 
Sun Storage 2530-M2 Array
 
Sun Storage 6140 Array
 

PLA-Support>Sun Systems>DISK>Arrays>SN-DK: ST25xx
 
_Old GCS Categories>Sun Microsystems>Storage - Disk>Modular Disk - 6xxx Arrays
 
_Old GCS Categories>Sun Microsystems>Storage - Disk>Modular Disk - 2xxx Arrays
 

Applies to:

Goal

There are some common misconceptions about what configuration is allowed, and what is not. This document seeks to address the allowable configurations, and supplement the existing help and man page entries, for Sun StorageTek Common Array Manager and Sun StorageTek SANtricity Storage Manager.

Solution

Vocabulary

• An Initiator/Host Port is an alias that links a Fibre Channel or SAS World Wide Port Name(WWPN) to a Host, and sets the Volume failover policy for operations coming from that specific WWPN via the Host Type setting.  iSCSI IQN's can be aliased in the same fashion.
• A Host is defined as a set of Initiators or Host Ports.  They have the same Host Type setting.
• A Host Group is defined as a set of Hosts.
• A Storage Domain is defined as a set of one or more Volumes mapped to a single Host or Host Group.; A storage domain is created upon first mapping a volume to a host or host group. The Default storage domain exists at all times.

Limitations

1. A volume can be mapped to a single defined host.
2. A volume can be mapped to a single defined host group.
3. A volume cannot be mapped to both a defined host and a defined host group.
4. The Default Storage Domain is a host group.
5. A host can be part of only one host group.
6. A host is part of the Default Storage Domain host group until it is defined in another host group.
7. You can create any number of hosts and host groups.
8. Up to 256 volumes can be mapped to a Storage Domain (up to 32 volumes per storage domain in 2500 Series arrays).
   It should also be noted that Not all operating systems support up to 256 LUN IDs, and hence the number of LUNs is limited based on "Host type" setting chosen for "Initiator/Host port" also. See the documentation for your operating system for more information.
9. Each Domain created uses a licensed Storage Domain, with the exception of the Default Storage Domain.

Example #1:

Map volumes 1, 2, and 3 to hosts A, B, and C.
Map volumes 4, 5, and 6 to hosts A, B, C, D, and E

• Is this possible?
• No. This would require two host groups:
  Group 1: A, B, C
  Group 2: A, B, C, D, and E
  This breaks Limitation number 5, as hosts A, B, and C would need to be in 2 different host groups.

Example #2:

Map volume 1 to host A
Map volume 2 and 3 to hosts B and C
Map volume 4 and 5 to host A and D

• Is this possible?
• Yes. Hosts A and D would be in one host group(AD), and hosts B and C would be in another(BC). You would map volume 1 to host A, volumes 2 and 3 to host group BC, and 4 and 5 to AD.
  
  
• What if I wanted to map volume 6 to host D?
• Still possible. You can map individual volumes to individual hosts.
  
  
• And if I wanted volume 6 to be seen by hosts D and B?
• Not possible. That would require that B and D be in more than one host group.

Example #3:

Volumes 1, 2, 3 mapped to the Default Storage Domain
Volumes 4 and 5 mapped to Host Group CD (host C and host D)
Volume 6 seen by host A
Hosts A and B in the Default Storage Domain

• Can volumes 1, 2, and 3 be seen by Host C or Host D?
• No. This falls under Limitations 5 and 6.
  
  
• Can host A see Volumes 4 and 5?
• No. This falls under Limitation 3.
  
  
• What do the hosts see?
• Host A: Volumes 1, 2, 3, and 6
  Host B: Volumes 1, 2, and 3
  Hosts C and D: Volumes 4 and 5

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