[stgt] Retry of failed I/O

[ronnie sahlberg]

I dont think any retry is done by tgtd.
The error is returned back to the initiator and then the initiator
will retry or do something else to try to recover.


On Mon, Nov 5, 2012 at 10:17 PM, Suresh Rajagopalan <r.raja05 at gmail.com> wrote:
> I'd like to find out what SCSI codes in Tgtd notify the block layer to
> retry a failed
> I/O.
>
> For example, in the current tgtd backing store code (bs_rdwr.c), a
> failed read or writes
> sets the following:
> static void set_medium_error(int *result, uint8_t *key, uint16_t *asc
> {
>         *result = SAM_STAT_CHECK_CONDITION;
>         *key = MEDIUM_ERROR;
>         *asc = ASC_READ_ERROR;
> }
>
>
> While this retries failed reads, failed writes are not retried.   Is there a
> particular code that will notify the client block layer to retry the
> I/O operation?
>
> Thanks
> Suresh
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