Sun Storage 9990 System
 
Sun Storage 9980 System
 

PLA-Support>Sun Systems>DISK>HighEnd Arrays>SN-DK: HDS_99xx
 
.Old GCS Categories>Sun Microsystems>Storage - Disk>Datacenter Disk
 

Applies to:

Symptoms

When sidefile was built up to reach the set threshold due to some Truecopy (TC) data link failing, Truecopy Asynchronous (TCA) did not suspend which subsequently causes the HPUX Servers Oracle databases and filesystem crashes. When TC OFFLOAD TIMER is set to Zero and when the sidefile usage threshold exceed the PENDING UPDATE RATE %. TCA do not SUSPEND which causes the SE99x0 cache usage to built up further. When the SE99x0 cache reaching bottleneck level, this would cause severe performance problem and possibly servers lost of access to the SE99x0. This issue had been documented in HDS Alert 9900V_045449 USP + RAID450: TCA - LINK FAILURE No SUSPEND - Severe Performance Problem.

Cause

 Customer had set in Sun StorEdge [TM] 9900 TrueCopy (TC) operations the Offload Timer to 0 and sidefile threshold to the default of 50%

Solution

Resolution
The above Problem will be encuntered with the following SE99x0 version Microcode Affected: RAID500: All versions RAID450: 21-12-01 and later The root cause has been found and resolved in the following fixed versions. RAID500 countermeasure RAID500-765: 50-03-99-00/09 and newer 50-03-xx versions. 50-04-49-00/00 and newer 50-04-xx versions. 50-05-23-00/00 and newer 50-03-xx versions. RAID450 countermeasure RAID450-689: 21-14-20-00/00 and newer 21-14-xx versions. If microcode cannot be upgraded yet, INTERIM SOLUTION: Set the OFFLOAD TIMER to 1.

Relief/Workaround
Set the OFFLOAD TIMER to 1.

Additional Information
For information on where and how to set the Offload Timer, please see Truecopy User Guide for detail. Attached to this document (attached id 86570: How to set Offloading_timer) is an extract from the user guide for easy reference.

Product
Sun StorageTek 9900 TrueCopy

Internal Comments
Apollo Escalation # 1-17323940.

Sidefile, Link Failure No Suspend, Offload Timer, Truecopy, Truecopy Asynchronous
Previously Published As
86121

Change History
Date: 2006-08-08
User Name: 31620
Action: Approved
Comment: Verified Metadata - ok
Verified Keywords - ok
Verified still correct for audience - currently set to contract
Audience left at contract as per FvF at
http://kmo.central/howto/content/voyager-contributor-standards.html
Checked review date - currently set to 2007-06-26
Checked for TM - no new ones needed
Publishing under the current publication rules of 18 Apr 2005:
Version: 4
Date: 2006-08-06
User Name: 128938
Action: Approved
Comment: As requested, I had modified the document with additional information and an attachment of an extract from the user manual on how to set the offloading_timer for reference. Sending back this document to Andrew for final review.
Version: 0
Date: 2006-08-06
User Name: 128938
Action: Add Attachment
Comment:
Version: 0
Date: 2006-07-24
User Name: 31620
Action: Rejected
Comment: Hi Weng-Fatt,

Thnak you for writing this knowledhe article. I have checked it over, and it is almost ready to publish. I have one request though...

Can you please supply an example of how to set the "OFFLOAD TIMER to 1" . A copy of a file, or a snapshot of a user interface screen is what I am looking for. This will make it easier for people to follow if they try to do this.


Verified Metadata - ok
Verified Keywords - ok
Verified still correct for audience - was set to free
Audience set to contract as per FvF at
http://kmo.central/howto/content/voyager-contributor-standards.html
Checked review date - currently set to 2007-06-26
Checked for TM - had to supply the correct TMark in title

Feel free to assign this article back to me and I will publish it as soon as I check your edits.

Best Regards,

Andy MacBain.
CNS Knowledge Engineer
Knowledge Operations
Version: 0
Date: 2006-07-21
User Name: 31620
Action: Accept
Comment:
Version: 0
Date: 2006-07-21
User Name: 47940
Action: Approved
Comment: aprouved. ok for the final Review.
Version: 0
Date: 2006-06-27
User Name: 47940
Action: Accept
Comment:
Version: 0
Date: 2006-06-27
User Name: 128938
Action: Approved
Comment: A recent customer problem encounter in the field may be a good reference for other sites with very low microcode levels.
Version: 0
Date: 2006-06-26
User Name: 128938
Action: Created
Comment:
Version: 0
Product_uuid
8fbb2800-0c7b-4270-af08-321ca89c0994|Sun StorageTek 9900 TrueCopy

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