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 <yezhiy...@bytedance.com> 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 > linux-lvm@redhat.com > https://listman.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > >
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