Re: increase SD_STATS ?

[Frederic TEMPORELLI <frederic.temporelli@ext.bull.net>]

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