[dm-devel] [PATCH] fix default IO restrictions
Mike Christie
mikenc at us.ibm.com
Mon Jan 26 16:24:02 UTC 2004
Christophe Saout wrote:
> I don't think that will happen. The values are already the allowed
> maximum values. Or am I wrong?
I don't think they are the max values. SCSI will override them depending
on the HBA settings.
Build a DM device from devices on a qla2300 or scsi_debug, and compare
the request sizes and merges between accessing the DM device and
accessing the SCSI device direclty.
>
> If the table isn't backed by a real device (like if it only contains an
> error target) the resulting queue will use those "unrealstic" values
> that exceed the system-wide limits. And a hardsect size of 0 bytes...
If you do not have a device, should you set sane IO restrictions in the
target accroding to your target implementation limits.
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