Asset ID:	1-71-1003846.1
Update Date:	2009-09-15
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1003846.1 :   Sun StorEdge[TM] 9900: Hitachi Dynamic Link Manager (HDLM) 256 LDEV per control unit limitation  


PreviouslyPublishedAs
205400

Description
256 LDEV limit per control unit applies to both:

-Physical number of LDEVS
-LDEVS that happen to have addresses above 256
Note: The information below assumes the Sun StorEdge[TM] 99xx array is configured with Sun supported HBAs. The 256 limit may be due to a third party HBA issue, as opposed to an HDLM issue as documented below.

Steps to Follow
HDLM v. 5.4 Solaris[TM] Hosts User's Guide (pg. 12, Table 2.3) documents a "maximum value" of 256 LDEVS/control unit on a Solaris[TM] host.
This maximum value apllies to:

1. configuring more than 256 LDEVS on a host where format presents a total of 257 physical LDEVS (this is the more obvious inference)

 c3t4d0
c3t4d1
c3t4d2
.
.
.
<continuing through 257>
.
.
c3t4d257

2. LDEVS with *addresses* that are larger than 256 (this is the less obvious inference) In the example below, format presents a total of 4 LDEVS, one of which has an address higher than 256.

Starting with the Sun StorEdge 9990, Storage Navigator can create up to 1023 LDEVS per control unit. This is not possible with the 9910/9960/9970/9980 which are all restricted to 256 LDEVs per control unit. Therefore, customer's are able to create LDEV addresses larger than 256.

 c3t4d0
c3t4d1
c3t4d2
c3t4d257 <----------not supported due to the limit

Format will present the c3t4d257 LDEV, but this configuration is not supported none the less. This issue is logged as an RFE with engineering and will be addressed in a future microcode release.

Product
Sun StorageTek 9990 System

Internal Comments
Per HDS Alert HDLM_039230, this is an RFE to be addressed in a future microcode release, but they didn't give any timeline as to when it would be addressed.

The above situation was found in ESC 1-8477187.



hdlm, limit, address, 256
Previously Published As
81807

Change History
Date: 2005-06-29
User Name: 7058
Action: Approved
Comment: Added product name to title. Expanded HDLM acronym for clarity.
Trademarked where needed. Spell ck OK. No dups.
Enabled STM to offset preformatted text.
Tags OK. Updated review date.
OK to publish.
Version: 5
Date: 2005-06-29
User Name: 7058
Action: Accept
Comment:
Version: 0
Date: 2005-06-29
User Name: 90779
Action: Approved
Comment: Transfer to Final Review after adding notice about Sun supported fibre channel adapter.
Version: 0
Product_uuid
15644879-f179-11d8-ab63-080020a9ed93|Sun StorageTek 9990 System

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