1. What is the kernel multipathing you refer to? 2. using MD to aggregate multiple paths to a virtual path is a very interesting idea which I will check. Correct me if I'm wrong but it does not support path failover ? Thanks, Dan > -----Original Message----- > From: Chris Croswhite [mailto:csc@cadence.com] > Sent: Wednesday, April 21, 2004 8:01 PM > To: Yang, Fred > Cc: 'LVM general discussion and development' > Subject: RE: LVM and multiple HBA ports > > > If you are using SDD with ESS, according to the manual, SDD does not > work with any volume manager (pg 186). I have tried w/EVMS and sure > enough and SDD 1.5.0.3-9, the device fails with any kind of lun > failure. This is why I had to use the kernel multipathing. The > unfortunate part, I can not figure out how to reclaim a failed path to > allow it work again once it has been failed. > > > > On Wed, 2004-04-21 at 09:35, Yang, Fred wrote: > > What storage you are using? Most storage vendor has their own multi > > path software, e.g. EMC's powerpath, IBM's SDD. We are > using IBM ESS, > > and we just use the vpath device to create PV, the SDD > actually do the > > load balancing&failover between multiple path. > > > > -Fred > > > > -----Original Message----- > > From: linux-lvm-bounces@redhat.com > > [mailto:linux-lvm-bounces@redhat.com] On Behalf Of Chris Croswhite > > Sent: Wednesday, April 21, 2004 12:17 PM > > To: LVM general discussion and development > > Subject: Re: LVM and multiple HBA ports > > > > Is this a multipathed device? I first create an MD device of a > > particular lun like this: > > mdadm -C -f -l mp -n 1 -x 1 /dev/md0 /dev/sd<x> /dev/sd<y> > > > > where x is channel A of the device and y is channel B. > > > > You can then verify it by: > > mdadm --detail /dev/md0 > > > > Does this help? > > > > On Wed, 2004-04-21 at 09:04, Dan Bar Dov wrote: > > > I have a problem using two (or more) ports connected to the same > > storage. > > > > > > Linux does not identify that the two LUNs it discovers is actually > > the same. > > > When I create a PV all is well. > > > The PV gets created and is ACTIVE. However, through the > other port, > > > the PV is also discovered, but is marked INACTIVE in the LVM > > database. > > > > > > When I try to create a VG using the active path, LVM scans all PVs > > in order. > > > If it finds the INACTIVE instance first, the VG creation fails. > > > > > > I'm using LVM 1.0.3, please let mw know if such a situation > > > (connecting storage through multiple ports) is handled better in > > > another version, or suggest how to overcome the problem. > > > > > > Thanks, > > > Dan > > > _______________________________________________ > > > linux-lvm mailing list > > > linux-lvm@redhat.com > > > https://www.redhat.com/mailman/listinfo/linux-lvm > > > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > > > _______________________________________________ > > linux-lvm mailing list > > linux-lvm@redhat.com > > https://www.redhat.com/mailman/listinfo/linux-lvm > > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
