Re: usage of max_sectors in scsi_host_template

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Erez Zilber wrote:
> I'm not sure that I understand the meaning of max_sectors in 
> scsi_host_template.

Did you have a look at scsi_mid_low_api.txt?
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/scsi/scsi_mid_low_api.txt;h=6f70f2b9327e1f0db7bc05bdbf2d6ce3b2fcbdcf#l1232

> Is it the maximum data length of a single SCSI command?

Yes.

> Is it in bytes?

No, it is in units of 512 bytes.

> What's the size of a sector?

"Usually" 512 bytes according to above doc.  Always 512 bytes from the
point of view of block/ll_rw_blk.c::blk_queue_max_sectors().
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=block/ll_rw_blk.c;h=75c98d58f4ddf7252e2717e0924b9d6a8925b4e5#l590
-- 
Stefan Richter
-=====-=-=== =-== --==-
http://arcgraph.de/sr/
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