From mboxrd@z Thu Jan 1 00:00:00 1970 From: guy keren Subject: Re: max number of paths Date: Mon, 15 Mar 2010 22:46:11 +0200 Message-ID: <4B9E9C93.2050202@actcom.co.il> References: <03FB5D708BE3C8448E8079186A56CDE60162B9C7@BTIBURMAIL.bustech.com> <4B9E9552.9000603@actcom.co.il> <03FB5D708BE3C8448E8079186A56CDE60162B9F9@BTIBURMAIL.bustech.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <03FB5D708BE3C8448E8079186A56CDE60162B9F9@BTIBURMAIL.bustech.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: device-mapper development List-Id: dm-devel.ids do the devices look something like /dev/sd*, or /dev/cciss/* or something similar? if the later - it _could_ be a driver-specific issue, and i would look for info about the specific block driver. --guy Charlie Sharkey wrote: > 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 > > -- > dm-devel mailing list > dm-devel@redhat.com > https://www.redhat.com/mailman/listinfo/dm-devel > > -- > dm-devel mailing list > dm-devel@redhat.com > https://www.redhat.com/mailman/listinfo/dm-devel