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Operating Systems Solaris Sense key unit attention & iostat hardware and transport errors on SAN disks Post 302837509 by cerber0 on Friday 26th of July 2013 02:31:55 AM
Old 07-26-2013
I think that this can be related to the queue_depth settings on the environment.

Basically, the Storage Port is saturated and is rejecting HBA requested, normally identified by the ASC=0x29 messages and transport_errors.

In solaris, the queue_depth concept is named max_throttle

Each Storage Vendor (netapp, emc, hds, ibm) have different recommendation for this value

Review your Storage recommendation, and set this parameter,

On Systems using SUN drivers the HBA, you can use the next line on /etc/system to set the max_throttle and io_time

Code:
set ssd:ssd_max_throttle=x
set ssd:ssd_io_time=180

The queue_depth, basically is the max simultaneous operations that a Storage port can be receive.

For example I can see that your Storage is Hitachi,

for the enterprise line (USPV, VSP) this value is 2048
for the midrage line (AMS,HUS) this value is 512

Then, the max_throtlle (queue_depth) can be calculated with the next formula (for enterprise)

Code:
Queue Depth = 2048 / Total number of LUNs defined on the port <= 32

I hope that this help you

Only for reference, the next is a text from Hitachi Knowledge Base

Code:
Fix                   :                                                 All SUN HBAs 6799, 6727, 6748, 6757, 6767, 6768 are supported by the SUN device driver stack. 
It is an SSD device driver.
Sun Solaris has a default Queue_Depth of 64 and I/O timeout of 30 seconds.  In most cases these 
parameters MUST be changed to avoid transport errors, such as:
SCSI transport failed: reason 'tran_err': retrying command

Set as follows:
/etc/system
set ssd:ssd_io_time=180
set ssd:ssd_max_throttle=n
Where n is 8 or 256/# of active initiators/# of LUNs

(Refer to the 9900V or 9900 Series Hitachi Freedom Storage Lightning Sun Solaris Configuration Guides.) 

 

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MooseX::Storage::Engine::Trait::DisableCycleDetection(3pUser Contributed Perl DocumentatMooseX::Storage::Engine::Trait::DisableCycleDetection(3pm)

NAME
MooseX::Storage::Engine::Trait::DisableCycleDetection - A custom trait to bypass cycle detection SYNOPSIS
package Double; use Moose; use MooseX::Storage; with Storage( traits => ['DisableCycleDetection'] ); has 'x' => ( is => 'rw', isa => 'HashRef' ); has 'y' => ( is => 'rw', isa => 'HashRef' ); my $ref = {}; my $double = Double->new( 'x' => $ref, 'y' => $ref ); $double->pack; DESCRIPTION
"MooseX::Storage" implements a primitive check for circular references. This check also triggers on simple cases as shown in the Synopsis. Providing the "DisableCycleDetection" traits disables checks for any cyclical references, so if you know what you are doing, you can bypass this check. This trait is applied to an instance of MooseX::Storage::Engine, for the user-visible version shown in the SYNOPSIS, see MooseX::Storage::Traits::DisableCycleDetection METHODS
Introspection meta BUGS
All complex software has bugs lurking in it, and this module is no exception. If you find a bug please either email me, or add the bug to cpan-RT. AUTHOR
Stevan Little <stevan.little@iinteractive.com> COPYRIGHT AND LICENSE
Copyright 2007-2008 by Infinity Interactive, Inc. <http://www.iinteractive.com> This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2009-08-11 MooseX::Storage::Engine::Trait::DisableCycleDetection(3pm)
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