Re: [PATCH 0/5] scsi: Allow fast io fail without waiting through timeout

2013-05-22 Thread Ren Mingxin
Hi, James, On 05/20/2013 11:53 PM, James Smart wrote: Based on the discussion recently held at LSF 2013, we are reworking the error recovery path to address all the issues you are mentioning. That work contradicts these patches. So for now, these should be held off. Interesting. Can I have

Re: [PATCH 0/5] scsi: Allow fast io fail without waiting through timeout

2013-05-22 Thread James Smart
yes - that was the session. Granted the posted notes were rather terse. More of the ideas were presented in this recent email thread: http://marc.info/?l=linux-scsim=136819142000596w=2 In general - we're going to create a LLD library for error handling, using paradigms in libsas, that: - no

[PATCH 0/5] scsi: Allow fast io fail without waiting through timeout

2013-05-20 Thread Ren Mingxin
When there is a scsi command timed-out or failed, the scsi eh tries a thorugh recovery, which is necessary for non-redundant systems. However, the thorugh recovery usually takes much time, which is not acceptable for misson critical systems. To improve this latency, if we are working on a

Re: [PATCH 0/5] scsi: Allow fast io fail without waiting through timeout

2013-05-20 Thread James Smart
Ren, Based on the discussion recently held at LSF 2013, we are reworking the error recovery path to address all the issues you are mentioning. That work contradicts these patches. So for now, these should be held off. -- james s On 5/20/2013 3:14 AM, Ren Mingxin wrote: When there is a