Queue depth setting on the Sun StorEdge[TM] 3511 Array

Asset ID:	1-71-1009329.1
Update Date:	2009-09-23
Keywords:

Solution Type Technical Instruction Sure

Solution 1009329.1 : Queue depth setting on the Sun StorEdge[TM] 3511 Array

Related Items


Sun Storage 3511 SATA Array

Related Categories


GCS>Sun Microsystems>Storage - Disk>Modular Disk - 3xxx Arrays

PreviouslyPublishedAs
212910

Description
The default value was changed to 32 from 8 with the release of the 5.55a SATA Router code in the 4.1x release of the controller firmware.

Steps to Follow

There are two queue depth settings on the SE3000 array.  Drive side which affects the backend, and Host side which affects the queue the controller allocates for host I/O. This discussion centers on the drive side value:
* drive-parameters
queue-depth: 8
This value is referred to in the firmware menu and documentation as the Maximum
Tag Count (Tag Command Queueing).
Before the release of the 4.1x controller firmware, a SATA router bug was
introduced in version 5.54e of that firmware when queuing more than the
supported 128 commands. Instead of sending back queue full status the command
would sometimes get stuck between the Sierra Logic controllers on the router.
To work around this problem, the queue depth was limited to 8.
This firmware bug was resolved in the 5.55a release of the SATA router firmware,
and the queue depth parameter was adjusted to 32
to be consistent with the 3510 default value.
When upgrading from 3.27x to 4.1X, when you save the NVRAM configuration
to disk this parameter will get saved. When your configuration is restored
this value will assume the original value of 8.
It is recommended that you check this value after an upgrade, and
modify the parameter to the new default of 32.
A change to this value does not require a reset to the array.
See document: SunStoredge 3000 Family RAID Firmware 4.1X Users Guide 817-3711-13.pdf

Product
Sun StorageTek 3511 SATA Array

SATA, router firmware, Sierra Logic, SE3511, queue depth, Maximum Tag Count, Tag Command Queueing
Previously Published As
82626

Change History
Date: 2005-09-16
User Name: 25440
Action: Approved
Comment: [TM] and product name in title. Publishing.
Version: 3
Date: 2005-09-16
User Name: 25440
Action: Accept
Comment:
Version: 0
Date: 2005-09-16
User Name: 38107
Action: Approved
Comment: Great discussion on the alias, very helpfull doc
Version: 0
Date: 2005-09-15
User Name: 38107
Action: Accept
Comment:
Version: 0
Date: 2005-09-15
User Name: 38701
Action: Approved
Comment: First draft please review
Version: 0
Date: 2005-09-15
User Name: 38701
Action: Created
Comment:
Version: 0
Product_uuid
9fdbb196-73a6-11d8-9e3a-080020a9ed93|Sun StorageTek 3511 SATA Array

Attachments

This solution has no attachment