[ovirt-users] Re: ISCSI Domain & LVM

On Tue, Jan 8, 2019 at 4:57 PM Ralf Schenk <rs(a)databay.de <mailto:rs@databay.de>> wrote: Hello, I cannot tell if this is expected on a node-ng system. I worked hard to get it up and running like this. 2 Diskless Hosts (EPYC 2x16 Core, 256GB RAM) boot via ISCSI ibft from Gigabit Onboard, Initial-Ramdisk establishes multipathing and thats what I get (and want). So i've redundant connections (1x1GB, 2x10GB Ethernet as bond) to my storage (Ubuntu Box 1xEPYC 16 Core, 128Gig RAM currently 8 disks, 2xNvME SSD with ZFS exporting NFS 4.2 and targetcli-fb ISCSI targets). All disk images on NFS 4.2 and via ISCSI are thin-provisioned and the sparse-files grow and shrink when discarding in VM's/Host via fstrim. My exercises doing this also as UEFI boot were stopped by node-ng installer partitioning which refused to set up a UEFI FAT Boot partition on the already accessible ISCSI targets.. So systems do legacy BIOS boot now. This works happily even if I unplug one of the Ethernet-Cables. [root@myhostname ~]# multipath -ll mpath-myhostname-disk1 (36001405a26254e2bfd34b179d6e98ba4) dm-0 LIO-ORG ,myhostname-disk size=50G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw |-+- policy='queue-length 0' prio=50 status=active | `- 3:0:0:0 sdb 8:16 active ready running |-+- policy='queue-length 0' prio=50 status=enabled | `- 4:0:0:0 sdc 8:32 active ready running `-+- policy='queue-length 0' prio=50 status=enabled   `- 0:0:0:0 sda 8:0  active ready running See attached lsblk. Looks like the lvm filter suggested by vdsm-tool is correct. Try to configure it and see if you hosts boot correctly. If not you will have to change to filter to match your setup. But multipath device named "mpath-myhostname" is alarming.  I would expect to see the device as 36001405a26254e2bfd34b179d6e98ba4 in lsblk.Maybe this is ok with the way your hosts are configured. Can you share also your /etc/multipath.conf? and any files under /etc/multpath/conf.d/? Also check that vdsm does not report mpath-myhostname or /dev/mapper/36001405a26254e2bfd34b179d6e98ba4 in the output of     vdsm-client Host getDeviceList Finally, the devices used for booting the host should have special more robust  multipath configuration, that will queue io forever instead of failing. Otherwise your host root file system cab become read only if you loose all paths to storage at the  same time. The only way to recover from this is to reboot the host. See these bugs for more info on the needed setup: https://bugzilla.redhat.com/show_bug.cgi?id=1436415 https://bugzilla.redhat.com/show_bug.cgi?id=1435335 To use proper setup for your boot multipath, you need this patch which is  not available yet in 4.2: https://gerrit.ovirt.org/c/93301/ Nir   Am 08.01.2019 um 14:46 schrieb Nir Soffer: > On Tue, Jan 8, 2019 at 1:29 PM Ralf Schenk <rs(a)databay.de > <mailto:rs@databay.de>> wrote: > > Hello, > > I'm running my Ovirt-Node-NG based Hosts off ISCSI root. That > is what "vdsm-tool config-lvm-filter" suggests. Is this correct ? > > [root@myhostname ~]# vdsm-tool config-lvm-filter > Analyzing host... > Found these mounted logical volumes on this host: > >   logical volume:  /dev/mapper/onn_myhostname--iscsi-home >   mountpoint:      /home >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > >   logical volume:  > /dev/mapper/onn_myhostname--iscsi-ovirt--node--ng--4.2.7.1--0.20181209.0+1 >   mountpoint:      / >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > >   logical volume:  /dev/mapper/onn_myhostname--iscsi-swap >   mountpoint:      [SWAP] >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > >   logical volume:  /dev/mapper/onn_myhostname--iscsi-tmp >   mountpoint:      /tmp >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > >   logical volume:  /dev/mapper/onn_myhostname--iscsi-var >   mountpoint:      /var >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > >   logical volume:  /dev/mapper/onn_myhostname--iscsi-var_crash >   mountpoint:      /var/crash >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > >   logical volume:  /dev/mapper/onn_myhostname--iscsi-var_log >   mountpoint:      /var/log >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > >   logical volume:  > /dev/mapper/onn_myhostname--iscsi-var_log_audit >   mountpoint:      /var/log/audit >   devices:         /dev/mapper/mpath-myhostname-disk1p2 > > This is the recommended LVM filter for this host: > >   filter = [ "a|^/dev/mapper/mpath-myhostname-disk1p2$|", > "r|.*|" ] > > This filter allows LVM to access the local devices used by the > hypervisor, but not shared storage owned by Vdsm. If you add > a new > device to the volume group, you will need to edit the filter > manually. > > Configure LVM filter? [yes,NO] > > > Yoval, is /dev/mapper/mpath-myhostname-disk1p2 expected on node > system? > > Ralf, can you share the output of: > lsblk > multipath -ll > multipathd show paths format "%d %P" > > Nir > > > > > Am 05.01.2019 um 19:34 schrieb tehnic(a)take3.ro > <mailto:tehnic@take3.ro>: >> Hello Greg, >> >> this is what i was looking for. >> >> After running "vdsm-tool config-lvm-filter" on all hosts (and rebooting them) all PVs, VGs and LVs from ISCSI domain were not visible anymore to local LVM on the ovirt hosts. >> >> Additionally i made following tests: >> - Cloning + running a VM on the ISCSI domain >> - Detaching + (re-)attaching of the ISCSI domain >> - Detaching, removing + (re-)import of the ISCSI domain >> - Creating new ISCSI domain (well, i needed to use "force operation" because creating on same ISCSI target) >> >> All tests were successful. >> >> As you wished i filed a bug: <https://github.com/oVirt/ovirt-site/issues/1857> <https://github.com/oVirt/ovirt-site/issues/1857> >> Thank you. >> >> Best regards, >> Robert >> _______________________________________________ >> Users mailing list -- users(a)ovirt.org <mailto:users@ovirt.org> >> To unsubscribe send an email to users-leave(a)ovirt.org <mailto:users-leave@ovirt.org> >> Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >> oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ >> List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/VD6WCL343YG... > -- > > > *Ralf Schenk* > fon +49 (0) 24 05 / 40 83 70 > fax +49 (0) 24 05 / 40 83 759 > mail *rs(a)databay.de* <mailto:rs@databay.de> >   > *Databay AG* > Jens-Otto-Krag-Straße 11 > D-52146 Würselen > *www.databay.de* <http://www.databay.de> > > Sitz/Amtsgericht Aachen • HRB:8437 • USt-IdNr.: DE 210844202 > Vorstand: Ralf Schenk, Dipl.-Ing. Jens Conze, Aresch Yavari, > Dipl.-Kfm. Philipp Hermanns > Aufsichtsratsvorsitzender: Wilhelm Dohmen > > ------------------------------------------------------------------------ > _______________________________________________ > Users mailing list -- users(a)ovirt.org <mailto:users@ovirt.org> > To unsubscribe send an email to users-leave(a)ovirt.org > <mailto:users-leave@ovirt.org> > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/HX3LO46HW6G... > -- *Ralf Schenk* fon +49 (0) 24 05 / 40 83 70 fax +49 (0) 24 05 / 40 83 759 mail *rs(a)databay.de* <mailto:rs@databay.de>   *Databay AG* Jens-Otto-Krag-Straße 11 D-52146 Würselen *www.databay.de* <http://www.databay.de> Sitz/Amtsgericht Aachen • HRB:8437 • USt-IdNr.: DE 210844202 Vorstand: Ralf Schenk, Dipl.-Ing. Jens Conze, Aresch Yavari, Dipl.-Kfm. Philipp Hermanns Aufsichtsratsvorsitzender: Wilhelm Dohmen ------------------------------------------------------------------------