linux-kernel - Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host

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Date:	Mon, 16 Nov 2015 13:10:06 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Lee Duncan <lduncan@...e.com>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Hannes Reinecke <hare@...e.com>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no
 management

On 11/13/2015 10:54 PM, Martin K. Petersen wrote:
>>>>>> "Lee" == Lee Duncan <lduncan@...e.com> writes:
> 
>>> Well, I'm a bit worried about the loss of a monotonically increasing
>>> host number from the debugging perspective.  Right now, if you look
>>> at any log, hostX always refers to one and only one incarnation
>>> throughout the system lifetime for any given value of X.
> 
> That's a feature that I would absolutely hate to lose. I spend a huge
> amount of time looking at system logs.
> 
Right. Then have it enabled via a modprobe parameters.

We actually had customers running into a host_no overflow due to
excessive host allocations and freeing done by iSCSI.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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