* increase SD_STATS ?
@ 2005-08-19 8:02 Frederic TEMPORELLI
2005-08-19 9:27 ` Christoph Hellwig
0 siblings, 1 reply; 3+ messages in thread
From: Frederic TEMPORELLI @ 2005-08-19 8:02 UTC (permalink / raw)
To: linux-scsi
Hi,
Due to SD_STATS=256 (/drivers/scsi/sd.c)
there's a limit on the max /dev/sd devices.
Now, we have a large FC fabric, with more than 3500 LUNs...
=> Of course, we have an Oops when an HBA is connected to the fabric
(still sd.c, BUG in function sd_iostats_bump when sd>SD_STATS)
What (bad) side-effects can be expected if we increase SD_STATS (4096 should be
nice, may be 8192) ?
Best regards.
--
Frederic TEMPORELLI
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: increase SD_STATS ?
2005-08-19 8:02 increase SD_STATS ? Frederic TEMPORELLI
@ 2005-08-19 9:27 ` Christoph Hellwig
2005-08-19 10:20 ` Frederic TEMPORELLI
0 siblings, 1 reply; 3+ messages in thread
From: Christoph Hellwig @ 2005-08-19 9:27 UTC (permalink / raw)
To: Frederic TEMPORELLI; +Cc: linux-scsi
On Fri, Aug 19, 2005 at 10:02:43AM +0200, Frederic TEMPORELLI wrote:
> Hi,
>
>
> Due to SD_STATS=256 (/drivers/scsi/sd.c)
> there's a limit on the max /dev/sd devices.
>
> Now, we have a large FC fabric, with more than 3500 LUNs...
> => Of course, we have an Oops when an HBA is connected to the fabric
> (still sd.c, BUG in function sd_iostats_bump when sd>SD_STATS)
>
> What (bad) side-effects can be expected if we increase SD_STATS (4096
> should be nice, may be 8192) ?
>From you description it looks like you are using some odd 2.4.x vendor
tree. Just upgrade to latest 2.6 and these limitations will go away.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: increase SD_STATS ?
2005-08-19 9:27 ` Christoph Hellwig
@ 2005-08-19 10:20 ` Frederic TEMPORELLI
0 siblings, 0 replies; 3+ messages in thread
From: Frederic TEMPORELLI @ 2005-08-19 10:20 UTC (permalink / raw)
Cc: linux-scsi
Hello Christoph,
Thanks for your answer.
Yes, I investigate about my kernel source (2.6.12) and I find that patches based
on a RHEL kernel sources have been applied. This explains the odd 2.4 sd.c.
Best regards.
Christoph Hellwig wrote:
> On Fri, Aug 19, 2005 at 10:02:43AM +0200, Frederic TEMPORELLI wrote:
>
>>Hi,
>>
>>
>>Due to SD_STATS=256 (/drivers/scsi/sd.c)
>>there's a limit on the max /dev/sd devices.
>>
>>Now, we have a large FC fabric, with more than 3500 LUNs...
>>=> Of course, we have an Oops when an HBA is connected to the fabric
>>(still sd.c, BUG in function sd_iostats_bump when sd>SD_STATS)
>>
>>What (bad) side-effects can be expected if we increase SD_STATS (4096
>>should be nice, may be 8192) ?
>
>
>>From you description it looks like you are using some odd 2.4.x vendor
> tree. Just upgrade to latest 2.6 and these limitations will go away.
>
> -
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>
--
Frederic TEMPORELLI
^ permalink raw reply [flat|nested] 3+ messages in thread
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2005-08-19 8:02 increase SD_STATS ? Frederic TEMPORELLI
2005-08-19 9:27 ` Christoph Hellwig
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