Re: [PATCH] st: implement sysfs based tape statistics v2

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----- Original Message -----
From: "Kai Mäkisara (Kolumbus)" <kai.makisara@xxxxxxxxxxx>
To: "Laurence Oberman" <oberman.l@xxxxxxxxx>
Cc: "Shane M Seymour" <shane.seymour@xxxxxx>, loberman@xxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, "James E.J. Bottomley (JBottomley@xxxxxxxxxxxxx)" <JBottomley@xxxxxxxxxxxxx>, jeffm@xxxxxxxx
Sent: Thursday, February 5, 2015 12:03:29 PM
Subject: Re: [PATCH] st: implement sysfs based tape statistics v2


> On 2.2.2015, at 17.16, Laurence Oberman <oberman.l@xxxxxxxxx> wrote:
> 
> I pulled this this morning and will be testing. The prior version was
> stable for me on the upstream and RHEL 6.5 kernel without exhaustive
> testing.
> We also just received more requests to get this into RHEL from HP /
> Red Hat customers.
> 
> Kai, what are your thoughts. I realize this is a large amount of
> additional code. I am not keen to create a driver just for stats as we
> would have to keep the rest of the st driver changes always in sync.
> 

I still think that the tape statistics should be exported like the statistics of “real” block devices, i.e., one sysfs file exporting on a single line the statistics that temporally belong together. James rejected this approach. I am leaving the decision about this code to him. I will neither ack nor nak this code.

Thanks,
Kai

Hello Kai,

I missed the earlier conversations with James, I will go search for them.
Do you mean add them so they are similar to the /proc/diskstats

cat /proc/diskstats
..
   8       0 sda 2258346 152801 291907067 5263795 388817 1518048 15013833 4542062 0 4794931 9803495
   8       1 sda1 717 102 26154 1179 8 2 80 76 0 1172 1254
   8       2 sda2 328 31 2872 1554 0 0 0 0 0 1554 1554
   8       3 sda3 2195205 151617 290898283 5203627 355053 1518046 15009528 4370598 0 4594137 9571937
   8       4 sda4 61921 1050 978350 57218 18 0 4225 34 0 56384 57185
  11       0 sr0 0 0 0 0 0 0 0 0 0 0 0
..


Laurence Oberman
Red Hat Global Support Service
SEG Team

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