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ssd model ?

>>Why is "time to first byte" 2 times faster on good old 7200 rpm's in software raid-1 over Intel SSD software raid-10 you should profile your web application to see which function is doing disk access. (BTW, even 1s is quite huge for TTFB. Seem strange that it's only disk related. Are you sure...

qm is for vm , pct for containers

If the linux kernel support it, no problem. (afaik,vm memory limit is around 4TB, so it should work too with host). I never have tested more than 512G

Hi, I had time to backports my patch to last proxmox5 here a qemu-server deb build. http://odisoweb1.odiso.net/qemu-server_5.0-21_amd64.deb (need to be installed on source and destination host) then: #qm migrateexternal <vmid> [<targetip>] --targetstorage <string> (you need to copy the root...

you mean a "template" ? when a vm is transformed in template, a snasphot is done on the vm and the vm config file have a new flag "template:1" in the config file. (which made the config readonly from the gui).

here a ubuntu kernel with spectre V1, V2 retpoline && meltdown fixed (builded with gcc 7.3 to have retpoline working) https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/spectre/+build/14293994/+files/linux-image-4.13.0-33-generic_4.13.0-33.36~retpoline4_amd64.deb

Hi fabian, with spectre v2, a guest vm can read host memory. https://googleprojectzero.blogspot.be/2018/01/reading-privileged-memory-with-side.html

I'm using chrony in production, it's faster to sync clock than ntpd, openntpd. (and timesyncd is only like an cron ntpdate, really not enough precision for ceph)

similar problem with elastic and meltdown patch >>https://discuss.elastic.co/t/kernel-update-on-ubuntu-17-10-causes-elasticsearch-to-panic/116865/8

>> Oops: 0010 [#4] SMP PTI maybe related to meltdown protection ? can you try to add in /etc/default/grub kernel options => nopti then #update-grub and reboot

>>gzip: stdout: No space left on device remove old kernel files manually from /boot/

yes. And you need a recent kernel in your vm too (>=4.14), to have the benefit of PCID

I'm waiting for retpoline integration in ubuntu kernel, seem to be faster to fix variant2.

https://pve.proxmox.com/wiki/Package_Repositories#_proxmox_ve_no_subscription_repository

don't install microcode for now, it's known to be buggy and do instability

maybe because kpti avoid access to kernel memory (so conntrack), from userland ? workaround : #conntrack -L|wc -l ?

ocfs2 is not dead (a lot of commit on the dev mailing list), but it's full of bug. (I'm using in production in some vms, and since kernel > 3.16, I have a lot of random crash ). for vm hosting, it's better to use a shared lvm.

Sorry, I'm a lot busy with spectre and meltdown currently, I'll work on them next month. (on last proxmox 5.1) Edit : My previous patches for proxmox4 where posted last year here: https://pve.proxmox.com/pipermail/pve-devel/2017-February/025441.html

seem to proxmox version ? guest os ? they are known bug with old qemu and old guest kernel too, with virtio nic not send gratuitous arp after live migration