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Buffers ZFS ARC cache Other system processes and so on... If you use ZFS, check with arc_summary how much RAM is being used by ZFS ARC cache, if you want you can limit it in /etc/modprobe.d/zfs.conf with options zfs zfs_arc_max= <MAX RAM IN BYTES>

Yesterday night I had a BSOD (CRITICAL_STRUCTURE_CORRUPTION) on a Windows 2012r2 VM, in this node I have 4 VMs: 1 pfSense, 1 CentOS, 1 Windows 2012r2 (the one with the BSOD) and 1 with an old Windows 2003. Given this OS difference, KSM is not merging pages (in fact in the GUI I see KSM sharing...

HP DL380 what Gen ? IMHO you have too low RAM if you want to use CEPH OSDs and VMs on the same hosts. And you need at least 2 boot disks (raid1) for OS and 3 CEPH disks for VM storage.

If you install the virtio balloon driver and install and enable ballon service inside the Windows VM, you will see the right memory usage in the proxmox interface

If your virtio drivers are not updated to the latest version, you could try updating those. You can try changing virtual hard disk from virtio to scsi. If you have kernel 4.13 you can try to donwgrade to version 4.10

ceph-disk list

In the last days I migrated a server with Proxmox 4.4 to 5.1, there are 2 Windows VMs: - an old Windows XP with IDE disk driver and LSI controller - a Windows 8.1 with VirtIO controller and VirtIO disk drivers I backed them up, installed the server from scratch with PVE 5.1 installer (ZFS raid...

All the nodes are always updated together, so yes, all on the same version. Actually I remove the replication task, recreated and actually seems working correct

ps aux --sort -rss

zpool status

Are you using zfs? Have you configured max memory for ARC cache?

My last replication status: $ pvesr status JobID Enabled Target LastSync NextSync Duration FailCount State 105-0 No local/pve-hs-3 2017-10-29_13:42:00 pending 501.631685 0 OK After that I disabled...

Is zpool status showing errors? On what disk? You could put offline that one disk and run a badblocks -w -v -s to check if there are badblocks You could install zfs-zed to have email message if there are errors on pool, so to have a warning mail in future if a problems arise

Zfs can directly provide a volume (block device) to be used as disk for virtual machines. You can't see files because there is no file

See output of zfs list

There could be something related to daylight saving time? This night in Italy the clocks have been put back 1 hour

Hello Today I noticed a strange behaviour in pvesr, it started to run a job id every minute even if the job is set to run every 30 minutes. I had to disable the replication to stop it. pveversion is the latest $ pveversion -v proxmox-ve: 5.1-25 (running kernel: 4.13.4-1-pve) pve-manager...

Windows 2003 and Windows 2012R2 on latest pve 5.1 working OK. Actually both on zfs but planning to move to ceph storage

Yes, zfs assign a directory to every zvol, however in pve storage.conf you don't have have defined them, in fact you have If you want a storage dir, you have to add it as directory (in Datacenter - Storage - Add choose directory)

Try to upgrade to 0.1.141 In Proxmox web interface, in the memory configuration of your VM, do you have balooning enable?