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VM disk corruption with LSM on Gluster
by Sander Hoentjen 27 Mar '19

27 Mar '19

Hello, tl;dr We have disk corruption when doing live storage migration on oVirt 4.2 with gluster 3.12.15. Any idea why? We have a 3-node oVirt cluster that is both compute and gluster-storage. The manager runs on separate hardware. We are running out of space on this volume, so we added another Gluster volume that is bigger, put a storage domain on it and then we migrated VM's to it with LSM. After some time, we noticed that (some of) the migrated VM's had corrupted filesystems. After moving everything back with export-import to the old domain where possible, and recovering from backups where needed we set off to investigate this issue. We are now at the point where we can reproduce this issue within a day. What we have found so far: 1) The corruption occurs at the very end of the replication step, most probably between START and FINISH of diskReplicateFinish, before the START merge step 2) In the corrupted VM, at some place where data should be, this data is replaced by zero's. This can be file-contents or a directory-structure or whatever. 3) The source gluster volume has different settings then the destination (Mostly because the defaults were different at creation time): Setting old(src) new(dst) cluster.op-version 30800 30800 (the same) cluster.max-op-version 31202 31202 (the same) cluster.metadata-self-heal off on cluster.data-self-heal off on cluster.entry-self-heal off on performance.low-prio-threads 16 32 performance.strict-o-direct off on network.ping-timeout 42 30 network.remote-dio enable off transport.address-family - inet performance.stat-prefetch off on features.shard-block-size 512MB 64MB cluster.shd-max-threads 1 8 cluster.shd-wait-qlength 1024 10000 cluster.locking-scheme full granular cluster.granular-entry-heal no enable 4) To test, we migrate some VM's back and forth. The corruption does not occur every time. To this point it only occurs from old to new, but we don't have enough data-points to be sure about that. Anybody an idea what is causing the corruption? Is this the best list to ask, or should I ask on a Gluster list? I am not sure if this is oVirt specific or Gluster specific though. Kind regards, Sander Hoentjen

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Thin clients connect to a virtual machine using spice and require a password
by xilazz＠126.com 27 Mar '19

27 Mar '19

Hello everyone, when I want to use the thin client to connect the virtual machine, I will use spice mode to connect, but I need to specify the port of the host and spice password. Could you please tell me where I can check the spice password of the virtual machine

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ETL DWH errors after restoring to a new server
by Staniforth, Paul 27 Mar '19

27 Mar '19

Hello, I have deployed a new machine to run our engine 4.2.8 using engine-backup to do a full backup/restore to a clean Centos install. We are now having a lot of errors with ovirt-engine-dwhd e.g. java.lang.OutOfMemoryError: Java heap space java.lang.OutOfMemoryError: GC overhead limit exceeded org.postgresql.util.PSQLException: An I/O error occured while sending to the backend. We had a file from 2015 /etc/ovirt-engine/engine.conf.d/10-setup-java.conf ENGINE_HEAP_MIN="5845M" ENGINE_HEAP_MAX="5845M" I changed it to ENGINE_HEAP_MIN=2g ENGINE_HEAP_MAX=4g and restarted the engine and dwhd But am still getting errors. Regards, Paul S. To view the terms under which this email is distributed, please go to:- http://leedsbeckett.ac.uk/disclaimer/email/

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Gluster VM image Resync Time
by Indivar Nair 27 Mar '19

27 Mar '19

Hi All, We are planning a 2 + 1 arbitrated mirrored Gluster setup. We would have around 50 - 60 VMs, with an average 500GB disk size. Now in case one of the Gluster Nodes go completely out of sync, roughly, how long would it take to resync? (as per your experience) Will it impact the working of VMs in any way? Is there anything to be taken care of, in advance, to prepare for such a situation? Regards, Indivar Nair

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oVirt Roles and Permissions
by Wood Peter 27 Mar '19

27 Mar '19

Hi, I'm trying to setup oVirt 4.2.8.2-1.el7 based on a few simple requirements: Users should be able to: 1) reate new VMs 2) create VMs from templates 2a) Ability to clone the template disk to create a VM independent of the template 3) create templates 4) view only the VMs they have permissions to work with i.e. UserVmManager role assign to them This was all possible through the "User Portal" in version 3 (3.6 is what I had). The new "VM Portal" doesn't allow users to create templates. In order to satisfy (3) users must login to the Admin Portal. This is OK but I created a new Admin role with just login permissions and users can see all VMs in the cluster. I assume a filter can be created but in general I don't want them to have that much visibility. I can probably get away without (3) but I still can figure out how to do (2a) using "VM Portal". All VMs created from a template are dependent on that template. Even if the template is optimized for Server. How do I accomplish this? Thank you in advance for any suggestions. -- Peter

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Can't manually migrate VM's (4.3.0)
by Ron Jerome 26 Mar '19

26 Mar '19

I've been running 4.3.0 for a few weeks now and just discovered that I can't manually migrate VM's from the UI. I get an error message saying: "Could not fetch data needed for VM migrate operation" Sounds like https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=1670701 Ron.

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Re: Using NFS on Gluster
by Strahil 26 Mar '19

26 Mar '19

Hi Indivar, You can do that , but is complicated. First, I would recommend you to use either replica 3 or replica 3 arbiter 1 cluster volumes. Second , you have 2 options - to use NFS provided by Cluster Cluster ,but this is deprecated and you will have to migrate from that option once it get's completely removed. Third option is to use CTDB to fail over your floating VIP and to start NFS-Ganesha. The benefit of using NFS-Ganesha is that it uses libgfapi and connects to all cluster nodes simultaneously providing accumulated performance. Best Regards, Strahil Nikolov On Mar 26, 2019 16:42, Indivar Nair <indivar.nair(a)techterra.in> wrote: > > > > > Hi All, > > > > We would like to set up a 2 node mirrored Gluster Storage using the ovirt installation tools, but use it as an NFS storage. > > > > We want to do this for 2 reasons - > > > > 1. We have a high-speed link between both the Gluster Nodes which we would like to use for brick replication rather than ovirt node's 1G link > > 2. We have fast SSD disks on the ovirt nodes which we would like to use for local NFS Caching (FS Caching) on the VM Images. > > > > In short, we would like to manage Gluster stroage using the ovirt web interface, but access the Gluster storage as an NFS Server. > > > > How can we do this? > > > > Thanks. > > > > Regards, > > > > > > Indivar Nair > >

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ovn-provider-network
by Staniforth, Paul 26 Mar '19

26 Mar '19

Hello, we are using oVirt-4.2.8 and I have created a logical network using the ovn-network-provider, I haven't configured it to connect to a physical network. I have 2 VMs running on 2 hosts which can connect to each other this logical network. The only connection between the hosts is over the ovirtmgmt network so presumably the traffic is using this? Thanks, Paul S. To view the terms under which this email is distributed, please go to:- http://leedsbeckett.ac.uk/disclaimer/email/

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Re: Changing Ovirt hosted engine memory
by Strahil 26 Mar '19

26 Mar '19

What is the output of 'free -h' on the engine? Doesn't it show the new memory size? You need to wait some time so the OVF get's updated. Best Regards, Strahil NikolovOn Mar 26, 2019 18:11, Dionysis K <dkstiler(a)gmail.com> wrote: > > Thanks you bust still not any resolution for some reason, it does not update the memory of the Hosted engine, while its on global maintenance, whatever i do either it will stay on the same number for example 5120 MiB either the above message > > The physical node that runs the Hosted Engine VM has it has 24 Gigs or ram installed, and availiable are 22 It reports on the gui > > Please any help would be appreciated > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)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/UAKOQ5FKHOY4Q…

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Using NFS on Gluster
by Indivar Nair 26 Mar '19

26 Mar '19

Hi All, We would like to set up a 2 node mirrored Gluster Storage using the ovirt installation tools, but use it as an NFS storage. We want to do this for 2 reasons - 1. We have a high-speed link between both the Gluster Nodes which we would like to use for brick replication rather than ovirt node's 1G link 2. We have fast SSD disks on the ovirt nodes which we would like to use for local NFS Caching (FS Caching) on the VM Images. In short, we would like to manage Gluster stroage using the ovirt web interface, but access the Gluster storage as an NFS Server. How can we do this? Thanks. Regards, Indivar Nair

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