On Tue, Jan 8, 2019 at 4:57 PM Ralf Schenk <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 -llmpath-myhostname-disk1 (36001405a26254e2bfd34b179d6e98ba4) dm-0 LIO-ORG ,myhostname-disksize=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@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-filterAnalyzing 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-disk1p2This 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 thehypervisor, but not shared storage owned by Vdsm. If you add a newdevice 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@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>
Thank you.

Best regards,
Robert
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Ralf Schenk
fon +49 (0) 24 05 / 40 83 70
fax +49 (0) 24 05 / 40 83 759
mail rs@databay.de

Databay AG
Jens-Otto-Krag-Straße 11
D-52146 Würselen
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
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Ralf Schenk
fon +49 (0) 24 05 / 40 83 70
fax +49 (0) 24 05 / 40 83 759
mail rs@databay.de

Databay AG
Jens-Otto-Krag-Straße 11
D-52146 Würselen
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


Ralf Schenk fon +49 (0) 24 05 / 40 83 70 fax +49 (0) 24 05 / 40 83 759 mail rs@databay.de		Databay AG Jens-Otto-Krag-Straße 11 D-52146 Würselen 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