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Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no management

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  Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no  management Hannes Reinecke <hare@suse.de> - 2015-11-16 13:20 +0100
    Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no  management Lee Duncan <lduncan@suse.com> - 2015-11-16 22:50 +0100
      Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no management "Martin K. Petersen" <martin.petersen@oracle.com> - 2015-11-18 00:30 +0100

#1270063 — 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@suse.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@suse.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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#1270623

On 11/16/2015 04:10 AM, Hannes Reinecke wrote:
> On 11/13/2015 10:54 PM, Martin K. Petersen wrote:
>>>>>>> "Lee" == Lee Duncan <lduncan@suse.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
> 

Martin: I will be glad to update the patch, creating a modprobe
parameter as suggested, if you find this acceptable.
-- 
Lee Duncan
SUSE Labs
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#1271739 — Re: [PATCHv4 1/1] SCSI: hosts: update to use ida_simple for host_no management

>>>>> "Lee" == Lee Duncan <lduncan@suse.com> writes:

Lee> Martin: I will be glad to update the patch, creating a modprobe
Lee> parameter as suggested, if you find this acceptable.

For development use a module parameter would be fine. But I am concerned
about our support folks that rely on the incrementing host number when
analyzing customer log files.

Ewan: How do you folks feel about this change?

-- 
Martin K. Petersen	Oracle Linux Engineering
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