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I have a Proxmox host machine with one large Centos KVM image running. The proxmox host has two drives in a ZFS raid1 like array. It has a single second drive used for backups. I want to backup this image and move it too new machine as fast as possible. This is the only KVM running on this...

So perhaps one of these would be a better choice? https://ark.intel.com/products/74949/Intel-SSD-DC-S3500-Series-80GB-2_5in-SATA-6Gbs-20nm-MLC

Think I am going to bump to 6 drives and 2 x 3 way mirror as suggested. Would this be a good ZIL device? https://ark.intel.com/products/97544/Intel-Optane-Memory-Series-16GB-M_2-80mm-PCIe-3_0-20nm-3D-Xpoint It states it requires a i7 processor. Will it work with an E5 processor and "M.2 PCIe...

If you were putting 4 7200 rpm sata drives in a proxmox zfs array and cared most about random i/o reads and writes and redundancy how should you set them up? What about 6 drives or 8 drives?

What would you recommend as a ZIL device? Does it need to be mirrored as well? What happens if it fails?

Have a very simple Proxmox install with 2 drives in a ZFS raid 1 like array. I would like to stop the KVM and move it to a different server with something like SCP. Is that possible?

https://pve.proxmox.com/wiki/Backup_and_Restore ionice: <integer> (0 - 8) (default = 7) Set CFQ ionice priority. I was wondering if this setting may speed things up? Should it be changed to 0?

I want to create a backup of a stopped VM as fast as possible. There will be no other VM's running at time I am creating this. Is there a way to speed up the process at price of system load etc?

Thanks for the reply. fstrim seems to create a great deal of system load the first time it is issued after reboot on the KVM client. Would it be better to mount the ext4 or xfs files system in fstab on the centos client with the discard option?

If I try to use fstrim -av on Centos 7 with its ext4 partition mounted on a standard-LVM running on a proxmox host using ZFS is the worst that will happen is it won't work? I have tried this on a test VM and it does seem to shrink the backup size running fstrim -a. I downloaded a large ISO...

So when I setup my Centos 7 VM under proxmox. What is the difference between if I used thin-KVM vs regular-KVM on the Centos 7 boxes root and largest partition? This regular-KVM does not pass through the fstrim discards from the Centos box to the host Proxmox box which in my case uses ZFS?

dd if=/dev/zero of=/zero bs=64k; sync; sync; sync; rm -f /zero Anyway to do this but have it stop when the filesystem is 95 percent full?

This is not thin-LVM just LVM.

This is a Centos 7 install with EXT4 on top of LVM. Is there any easy way to convert it from LVM to thin-LVM or no LVM?

If its a regular LVM and not thin is there anyway to make fstrim work to reduce physical disk usage and backup size?

So if I have Centos 7 with EXT4 installed on LVM fstrim will not work?

Is it possible to move a KVM from a proxmox 4.x host to a proxmox 5.x host without doing the backup and restore? Wondered if it would be faster to somehow shut it down then move it with ssh?

I currently have several KVMs running inside a simple proxmox host that do a lot of random disk io. The proxmox host is using two sata drives in a RAID 1 type array. I was thinking of moving to 6 drives in a RAID 6 type array. Would that improve disk io speed significantly or not? I found...

Will there be any issues running this way indefinitely rather then a bios update?

Do you add non-free too: /etc/apt/sources.list Then just do a: apt-get install intel-microcode