Re: How to convert a single path to a multipath after using dm-multipath
Zhiyong Ye <[email protected]>
| Newsgroups | gmane.linux.lvm.general |
|---|---|
| Message-ID | <[email protected]> |
Hi Giorgio, Thank you for your reply and detailed answers. When I filtered out the sda device on the lvm configuration file it works fine. Thank you again for your help. Regards Zhiyong On 4/13/23 6:54 PM, Giorgio Bersano wrote: > Hi Zhiyong, > did you filter out the device in lvm.conf ? > > filter = [ ... , "r/sd.*/" , ... ] > > or "r/sda/" if you want to only exclude sda > > Regards, > Giorgio. > > > Il giorno gio 13 apr 2023 alle ore 08:55 Zhiyong Ye > <[email protected] <mailto:[email protected]>> ha scritto: > > > Hi Dave, > > Thank you for your reply. > > Because I had not considered multi-pathing before, there is no way to > configure mpath on sda alone on the current stock of machines. And I > tested this in my environment using lvchange --refresh, but it doesn't > switch the active LV to use mpatha. > > # lvchange --refresh is-he57e6mr4wemb19kgf8i > WARNING: Not using device /dev/mapper/mpatha for PV > HgL3xR-qTio-m75Q-nGAO-Un0U-8uHk-wHbH25. > WARNING: PV HgL3xR-qTio-m75Q-nGAO-Un0U-8uHk-wHbH25 prefers device > /dev/sda because device is used by LV. > > # pvs > WARNING: Not using device /dev/mapper/mpatha for PV > HgL3xR-qTio-m75Q-nGAO-Un0U-8uHk-wHbH25. > WARNING: PV HgL3xR-qTio-m75Q-nGAO-Un0U-8uHk-wHbH25 prefers device > /dev/sda because device is used by LV. > PV VG Fmt Attr PSize PFree > /dev/sda is-he57e6mr4wemb19kgf8i lvm2 a-- 10.00t 9.98t > > This is because duplicate PVs are encountered during the disk discovery > phase, but lvmcache tends to use sda because it is currently being used > by LV and mpatha will be dropped. > > I debugged the _choose_duplicates function in lvmcache and printed the > following log: > lvm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25 compare duplicates: > /dev/mapper/mpatha 254:3. /dev/sda 8:16. device_hint /dev/sda. > vm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25: size 21474836480. > /dev/mapper/mpatha is 21474836480. /dev/sda is 21474836480. > lvm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25: /dev/mapper/mpatha > was prev <none>. /dev/sda was prev <none>. > lvm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25: > /dev/mapper/mpatha is > in subsystem. /dev/sda is not in subsystem. > lvm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25: > /dev/mapper/mpatha is > dm. /dev/sda is not dm. > lvm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25: /dev/mapper/mpatha > has no mounted fs. /dev/sda has no mounted fs. > lvm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25: > /dev/mapper/mpatha is > not used for LV. /dev/sda is used for LV. > lvm[3352450]: PV HgL3xRqTiom75QnGAOUn0U8uHkwHbH25 with duplicates will > change from /dev/mapper/mpatha to /dev/sda. > lvm[3352450]: Dropping unchosen duplicate /dev/mapper/mpatha > lvm[3352450]: Adding chosen duplicate /dev/sda > > Is there any way to change the PV preference policy in > _choose_duplicates? > > > > > Regards > > Zhiyong > > On 4/11/23 9:31 PM, David Teigland wrote: > > On Tue, Apr 11, 2023 at 01:29:42PM +0800, Zhiyong Ye wrote: > >> and lv on it. I then turn on the multipath function and merge > the two paths > >> into a new device (/dev/mapper/matha), and I get the following > error when I > >> execute the lvm command. > >> > >> # pvs > >> WARNING: Not using device /dev/mapper/matha for PV > >> HgL3xR-qTio-m75Q-nGAO-Un0U-8uHk-wHbH25. > >> WARNING: PV HgL3xR-qTio-m75Q-nGAO-Un0U-8uHk-wHbH25 prefers > device /dev/sda > >> because device is used by LV. > >> PV VG Fmt Attr PSize PFree > >> /dev/sda is-he57e6mr4wemb19kgf8i lvm2 a-- 10.00t 9.98t > > > >> May you please advise how one can convert the pv used by vg from > sda to > >> matha without affecting the current lv usage. > > > > lvchange --refresh should refresh the active LV to use mpatha. > To avoid > > this, you might configure mpath on sda alone prior to adding the > second > > path. > > > > Dave > > > > _______________________________________________ > linux-lvm mailing list > [email protected] <mailto:[email protected]> > https://listman.redhat.com/mailman/listinfo/linux-lvm > <https://listman.redhat.com/mailman/listinfo/linux-lvm> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > <http://tldp.org/HOWTO/LVM-HOWTO/> > _______________________________________________ linux-lvm mailing list [email protected] https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/