Re: [Scst-devel] Lockup of SCST provisioning during heavy load

[Bart V. A. <bva...@ac...>]

On Tue, Nov 29, 2011 at 9:51 AM, Vladimir Shveidel <
vla...@xt...> wrote:

> And lastly, though I'm not sure it has anything to do with the above. At
> least twice I've noticed that the SCST reports "Waiting for xxx active
> commands to complete...", where xxx was unreasonably large: 17000-18000.
> As far as I understand, it is just much more then SCST queue size (it is
> saying about 30 volumes/LU configuration).
>

SCST_MAX_TGT_DEV_COMMANDS defines the maximum number of commands that will
be queued per LUN but without counting the commands for which a BUSY
response will be sent back because more than SCST_MAX_TGT_DEV_COMMANDS are
being processed for that LUN. The number of commands reported in the
"Waiting for xxx active commands to complete..." includes the commands for
which a BUSY response will be sent back and hence can be larger than
(number of LUNs) * SCST_MAX_TGT_DEV_COMMANDS product.

Bart.