[illumos-Developer] Changing sd_io_time to 8?

[Joerg Schilling]

"Garrett D'Amore" <garrett at nexenta.com> wrote:

> I think we can be smarter here too.
>
> CDROMS need a longer recovery time.
>
> Disks on Parallel SCSI might need longer.
>
> Disks on fibre, SAS, and SATA, should all respond within a narrow window
> of time unless something is seriously amiss.

There is no difference between Parallel SCSI and other SCSI transports besides 
just the transport itself.

A hard-disk that is just booting after a power on or reset and that has read 
problems in one of the copies for the firmware sectors or in one of the copies
for the defect list sectors may take a _long_ time too to recover and it is of 
course worth to wait at least a minute in such a case.

If you really like to speed things up, start thinking about a way to reduce the 
number of driver level _retries_ in case of problems if the related disk is 
part of a RAID-Z2 and the dataa could be recovered otherwise.

Jörg

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