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Re: [dm-devel] max number of paths



I'm seeing this on a Suse Sles10 x86_64 system, 2.6.16.60-0.34-smp.
I have a qlogic qle2462 connected to a hp eva back end. 



-----Original Message-----
From: dm-devel-bounces redhat com [mailto:dm-devel-bounces redhat com]
On Behalf Of guy keren
Sent: Monday, March 15, 2010 4:15 PM
To: device-mapper development
Subject: Re: [dm-devel] max number of paths


Charlie Sharkey wrote:
>  
> 
> Is there a maximum number of paths supported by the device mapper ?
> 
> I have a setup with 12 paths to 14 luns. I had to reduce the number of
paths
> 
> to 10 for the device mapper to startup correctly.

i have seen such problems with linux kernel 2.4, long ago, when max SCSI

disk devices was 256 (and hence - also max paths for such devices).

if you're not using SCSI, but rather some other type of device - it 
could be a limitation of the specific low level driver.

which kernel are you using? and which linux distribution? and what kind 
of block devices do your disks reside on?

--guy

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