From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christophe Varoqui Subject: Re: LVM Multipathing Date: Sun, 13 Feb 2005 11:28:32 +0100 Message-ID: <420F2BD0.4020707@free.fr> References: <000001c5119d$7dfb5c50$11051aac@pcp41116> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <000001c5119d$7dfb5c50$11051aac@pcp41116> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: shahid.shaikh@patni.com, device-mapper development List-Id: dm-devel.ids Hello, This is documented in the multipath-tools' FAQ. In lvm2.conf, you need to exclude the paths from the scaning, and allow DM devices to be scaned. regards, cvaroqui shahid shaikh wrote: >Hi, > >I am trying to test multipathing on lvm2. > >Configuration that i am using is as below: > >OS : SLES9 ( kernel 2.6.5) >lvm : lvm2-2.00.15-0.3 >multipath-tools : multipath-tools-0.2.1 >udev : udev-021-36.32 >sysfs : sblim-cmpi-sysfs-1.1.5-0.2 >hotplug : hotplug-0.44-32.21 and hotplugctl-0.08-264.1 >device-mapper : device-mapper-1.00.09-17.5 > >I tried following things : > >When I dont have multipaths for LUNs: >1) I tried to create PVs on LUNs using pvcreate >2) Then VGs using above PVs by command vgcreate >3) Then I have created some LVs on VGs. >4) I also fire some I/O on these LVs. >All aboe commands worked succesfully reflecting changes in pvscan, vgscan >and lvscan. > >When I have multiplepaths to LUNs: >I tried to create PV on one of the device but on doing pvscan it shows me >some other device. > e.g My LUN no 5 has for paths so I can see these four paths as >/dev/sdb, /dev/sdg, /dev/sdl and /dev/sdq. > then i did following > linux# pvcreate /dev/sdb > /dev/sdb successfully created > linux# pvscan > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdb not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdg not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdl not >/dev/sdq > PV /dev/sdq VG vg01 lvm2 [1.00 GB / 972.00 MB free] > Total: 1 [1.00 GB] / in use: 1 [1.00 GB] / in no VG: 0 [0 ] > > linux# vgcreate vg01 > succesfully created > > linux# vgscan > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdb not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdg not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdl not >/dev/sdq > > I tried the same thing with all permutations but i couldnt create a volume >group. > > I also have multipath-tools-0.3.9 and multipath-tools-0.4.2. > But I am not sure whether they will compatible with kernel 2.6.5. > >If you can help me in this scenario I will be thankfull to you. >Please let me know the steps through which I can achieve multipathing on my >configuration. > >Thanks and Regards, >Shahid Shaikh. > > > >http://www.patni.com >World-Wide Partnerships. World-Class Solutions. >_____________________________________________________________________ > >This e-mail message may contain proprietary, confidential or legally >privileged information for the sole use of the person or entity to >whom this message was originally addressed. Any review, e-transmission >dissemination or other use of or taking of any action in reliance upon >this information by persons or entities other than the intended >recipient is prohibited. If you have received this e-mail in error >kindly delete this e-mail from your records. If it appears that this >mail has been forwarded to you without proper authority, please notify >us immediately at netadmin@patni.com and delete this mail. >_____________________________________________________________________ > > >------------------------------------------------------------------------ > >-- >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