Re: [linux-lvm] Question about filter behavior on pvcreate /dev/md0
Hello Zdenek, Thank you for your reply. Your method works well. I also understand the filter rules gradually. On 6/14/19 4:51 PM, Zdenek Kabelac wrote: > Dne 13. 06. 19 v 9:41 Heming Zhao napsal(a): >> Hello List, >> >> I created a md device, and used pvcreate to format it. >> But the pvcreate was failed with filter rules. >> the filter in /etc/lvm/lvm.conf: >> ``` >> filter = [ "r|/dev/.*/by-path/.*|", "r|/dev/.*/by-id/.*|", >> "r|/dev/fd.*|", "r|/dev/cdrom|" ] >> ``` > > > Hi > > This filter mostly eliminates ANY block device you have in the system. > The logic of filtering can be seen as puzzling, but please try to read > carefully comments in lvm.conf about filtering. It's explained there in > the great detail. > > As soon as the 'accept' rule is seen - the device gets accepted. > Otherwise if you remove device path - all it's associated clones will be > also removed. > > So when you block device generates one of /dev/*/by-path access paths > (and I'd assume /dev/md0 should be) - it gets removed. > > As 'quick fix' you can add 'a' rule for /dev/md.*... > > Regards > > Zdenek > ___ 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/
Re: [linux-lvm] Question about filter behavior on pvcreate /dev/md0
Dne 13. 06. 19 v 9:41 Heming Zhao napsal(a): Hello List, I created a md device, and used pvcreate to format it. But the pvcreate was failed with filter rules. the filter in /etc/lvm/lvm.conf: ``` filter = [ "r|/dev/.*/by-path/.*|", "r|/dev/.*/by-id/.*|", "r|/dev/fd.*|", "r|/dev/cdrom|" ] ``` Hi This filter mostly eliminates ANY block device you have in the system. The logic of filtering can be seen as puzzling, but please try to read carefully comments in lvm.conf about filtering. It's explained there in the great detail. As soon as the 'accept' rule is seen - the device gets accepted. Otherwise if you remove device path - all it's associated clones will be also removed. So when you block device generates one of /dev/*/by-path access paths (and I'd assume /dev/md0 should be) - it gets removed. As 'quick fix' you can add 'a' rule for /dev/md.*... Regards Zdenek ___ 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] Question about filter behavior on pvcreate /dev/md0
Hello List, I created a md device, and used pvcreate to format it. But the pvcreate was failed with filter rules. the filter in /etc/lvm/lvm.conf: ``` filter = [ "r|/dev/.*/by-path/.*|", "r|/dev/.*/by-id/.*|", "r|/dev/fd.*|", "r|/dev/cdrom|" ] ``` if I remove the filter, pvcreate will be successful. why? steps: ``` # rpm -qa | grep lvm2 lvm2-2.02.180-10.el7_6.7.x86_64 lvm2-libs-2.02.180-10.el7_6.7.x86_64 # dd if=/dev/zero of=/dev/sda bs=1M ... ... # dd if=/dev/zero of=/dev/sdb bs=1M ... ... # mdadm -C /dev/md0 -l 0 -n 2 -a yes /dev/sda /dev/sdb mdadm: Defaulting to version 1.2 metadata mdadm: array /dev/md0 started # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:00 256M 0 disk └─md09:00 508M 0 raid0 sdb 8:16 0 256M 0 disk └─md09:00 508M 0 raid0 vda253:00 40G 0 disk ├─vda1 253:101G 0 part /boot ├─vda2 253:20 38G 0 part / └─vda3 253:301G 0 part [SWAP] # pvcreate /dev/md0 Device /dev/md0 excluded by a filter. ``` Thanks zhm ___ 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/
