Mark Syms
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Posts posted by Mark Syms
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There was never a supported upgrade process for XenServer 7.5 to Citrix Hypervisor 8.2, there was a supported process for XenServer 7.6 and for XenServer 7.1 CU2 LTS. All of these 7.x releases are now long out of support and there is no supported upgrade process from them to Citrix Hypervisor 8.2 CU1 LTS.
7.1 was not newer than 7.5 but was supported for longer by virtue of it being an LTS release whereas 7.5 was a Current Release which was only supported for 3 months after 7.6 was released.
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XenServer 8.1 has been out of support for 4 years. If the LUN is close to full it is impossible for the background cleanup process to merge the data that has been unlocked by deleting the snapshots as this typically requires extra space during the merge process.
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You can't share storage between two different XenServer pools, it's just not supported or possible
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You want to remove the VBD object which is the mapping object between the VDI and the VM. Also, if the guest has the drive active and mounted you may not be able to remove it until it is deactivated in the guest.
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12 hours ago, Ken Zygmunt said:
so are Citrix going to release a new article that provides best practise advice?
There are no plans to do so, no, mainly because the settings are almost always specific to a given deployment. Therefore giving any sort of guidance beyond letting the system manage things based on its own internal rules is next to impossible.
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This forum is specifically for the XenServer Hypervisor so your question is probably in the wrong forum. You probably want https://discussions.citrix.com/forum/151-virtual-apps/
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And would be better asked in https://discussions.citrix.com/forum/151-virtual-apps/ or https://discussions.citrix.com/forum/37-virtual-desktops/ and not this forum which is specifically for the XenServer Hypervisor. People who follow this channel are much less likely to be able to assist you than the correct Apps and Desktops channels.
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That article should not be used (we're having it removed), it's actively dangerous on all modern hardware and doesn't do as stated on in-support versions of XenServer either.
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Yep, that's the one.
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39 minutes ago, Jeff Riechers1709152667 said:
XenServer runs under the CentOS 8 kernel, so I would test RHEL 8 drivers to see if that gets you what you need.
No, it really doesn't.
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Veeam had a bug that meant that it did not interact well with XenServer. They have a fix but the last I heard was that it had not yet been released. So that might be part of the cause of this issue.
As you say though this is all long out of support.
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This was Dell not certifying their hardware and also not providing the required driver. The PERC12 (H965) is not compatible with XenServer and will not work as it only exposes 4K block size drives the host.
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It is a deliberate change in the Window virtual network driver.
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Windows 11 will not be supported on Citrix Hypervisor 8.2, the architectural changes required to meet the requirements of Windows 11 mean this will only be supported in a new release of XenServer expected to be released this year.
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The async mode supported by the Linux Kernel NFS server technically violates the NFS Specification (and is documented as such) so it's not entirely surprising that vendors do not supoprt it in their expensive hardware filers as it reduces the guarantees for data integrity.
XenServer quite rightly asserts that I/O must be confirmed completed by the remote storage before those I/O operations are reported as completed to the VM guests and if this results in the filer having to complete expensive operations then the fault lies in the filer.
For the NetApp in particular this should not be the case as all write operations go first to non-volatile memory (and are thus safe) and then are flushed to the backing storage in the background.
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12 hours ago, Kyle Peterson said:
We use a netapp A250 and netapp wants nfs to be async as well but citrix defaults to sync.
No, no it doesn't. The setting is server side in the NFS storage, there is no setting that Citrix Hypervisor/XenServer can set to force Asynchronous I/O to the Filer.
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Unfortunately Dell are not correct in this assertion. The sync/async setting is a server side setting, possibly one that their filer software does not support. It is not possible for a client to request async from a server which is configured with sync.
See https://linux.die.net/man/5/exports and the explanation of General Options.
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Also, if that was an existing machine catalog then I think you might need to either recreate it or make some configuration changes to the Hosting Connection (I can't remember how much you're allowed to change on an active connection and how much has to be set on creating a new one).
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Have you followed these instructions as well? (The formatting on the docs page is a bit wonky, I'll see if we can get that fixed)
xe host-disable host=hostname localsr=`xe sr-list type=ext host=hostname params=uuid --minimal` xe host-enable-local-storage-caching host=hostname sr-uuid=$localsr xe host-enable host=hostnameIn particular the host-enable-local-storage-caching is crucial
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If the VM were hung it would not be producing Write IOs at a rate faster than what the GC process can consolidate them. That it is gives a pretty good indication that the VM is live and active.
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Unlikely to help doing a powerstate reset. Shutting the VM down for a period and running a scan of the SR while it is stopped may address the issue, or reducing the amount of data being written.
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You're better using the Conversion manager component of the Citrix Hypervisor to pull the VM from Vmware - https://docs.citrix.com/en-us/citrix-hypervisor/8-2/conversion-manager.html
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If it's running XenServer 7.2 I very much doubt it has support as that product went End of Life over 4 years ago and there is now no supported mechanism to update or upgrade to a supported release. Typically this means installing a new server on a supported release and migrating the VMs onto it.
See - https://www.citrix.com/en-gb/support/product-lifecycle/legacy-product-matrix.html
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The GFS2 SR is supposed to update the usage automatically, if it's not then that's a bug.
Hypervisor 8.2 / block based storage FC max size
in Storage
Posted
There is no maximum LUN size for FC storage.