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Date: Fri, 12 Sep 2008 13:20:52 -0700
From: Andrew Sharp <andy.sharp@onstor.com>
To: "John Culp" <john.culp@onstor.com>
Cc: "Shin Irie" <shin.irie@onstor.com>, "Xian Hong" <hxian@onstor.com>,
 "dl-cstech" <dl-cstech@onstor.com>
Subject: Re: [case 9593] Many I/O retries and performance decrease
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Yeesh.  Is there a defect filed on this?

On Fri, 12 Sep 2008 08:58:46 -0700 "John Culp" <john.culp@onstor.com>
wrote:

> I have also see this at DMIP customers during mirror synch.  It seemed
> that a timely reboot of the filer (every two to three weeks) resolved
> this issue.  
> 
> John Culp 
> 940-239-7489 Office 
> 972-523-4287 Cell 
> 
> 
> -----Original Message-----
> From: Shin Irie 
> Sent: Friday, September 12, 2008 2:35 AM
> To: Xian Hong; dl-cstech
> Subject: RE: [case 9593] Many I/O retries and performance decrease
> 
> Start with this page.
> 
> http://wiki.onstor.net/wiki/Troubleshooting_Volumes
> 
> <quote>
> Basically, this is a 15-second timeout. I/O latency is greater than 15
> seconds to get this message. This message occurs if the array is
> rebuilding, scrubbing, or being shared with another host, there is any
> problem in SAN etc.
> </quote>
> 
> 
> --
> Irie
> 
> 
> -----Original Message-----
> From: Xian Hong 
> Sent: Friday, September 12, 2008 4:16 PM
> To: dl-cstech
> Subject: [case 9593] Many I/O retries and performance decrease
> 
> Dear all,
> IHAC that had performance decrease issue (from 50MB/sec write to
> 20MB/sec write) while many I/O retries error:
> 
> 
> Sep 10 11:05:52 ba1800-2 : 1:2:evm:WARNING: 35552: [][]: 2 I/O retries
> for volume[vol3]. 
> Sep 10 11:06:11 ba1800-2 : 1:2:evm:WARNING: 35553: [][]: 2 I/O retries
> for volume[vol3]. 
> Sep 10 11:06:26 ba1800-2 : 1:2:evm:WARNING: 35554: [][]: 2 I/O retries
> for volume[vol3].
> 
> 
> How to troubleshoot such issue?
> And can we modify the I/O timeout threshold to minimize I/O retry?
> 
> Thanks
> Hong
> 
> -----Original Message-----
> From: Support Systems 
> Sent: Friday, September 12, 2008 1:44 PM
> To: dl-Customer Service Cases
> Subject: [United Information Technology (UIT)] 9593: "[China Digital
> ba1800-2] Bobcat I/O performance decrease rapidly" - New case comment.
> 
> A new comment has been added to case 9593 by Leon Lei.
> https://ssl.salesforce.com/50000000001dF20AAE
> 
> ---------------- Comment: ----------------
> 
> Hi,
> 
>   How much is the I/O timeout threshold?
> 
>   If there is any other effect on data I/O except performance
> decrease?
> 
>   The switch's log is attached.
> 
>   Bobcats use pot 2,5 of each Brocade sw200e.
> 
>   Disk array user port 0,1,4,5 of each Brocade sw200e.
> 
> 
