> https://forum.proxmox.com/threads/opt-in-linux-6-8-kernel-for-proxmox-ve-8-available-on-test-no-subscription.144557/post-651341
the reported performance differences of docker inside lxc here is one more reason for me to to NOT use docker inside LXC or recommend doing so.
hello,
does anybody know some good site which is benchmarking ssd's for comparison and which provides reliable and good information regarding sustained write capability ?
for many many ssd, especially the cheaper ones, sustained write really sucks ...
@Stoiko Ivanov , mhh, nicht problematisch ? anwendungen sperrt doch aus security gründen in einen chroot und gerade die sollten doch up to date sein !?
ich habe hier mal ein bugticket aufgemacht, weil sich mir nicht erschliesst warum das nicht problematisch ist wenn der chroot inhalt veraltet...
>Yes, we know and that's why we expose disabling copy-on-write for data (which is mentioned also as workaround in the linked report), it's currently configurable per storage:
https://git.proxmox.com/?p=pve-storage.git;a=commitdiff;h=d3c5cf24876d2b0e1399f717e2f77eaf063ae7a7
ah, good to know...
you should check your kernel log / dmesg for errors. i guess your usb connection isn't stable or your usb stick is not reliable . could also be related to powersave settings on usb ports
meanwhile, i have found that there are quirks in action:
https://forum.proxmox.com/threads/virtual-disk-default-no-cache-settings-weirdness.143430/
https://pve.proxmox.com/wiki/Storage:_BTRFS
"BTRFS will honor the O_DIRECT flag when opening files, meaning VMs should not use cache mode none...
> Setting „Default (No cache)“ seems to be different from setting „No cache“. When „No cache“ is being selected, then cache=none is explicitly added to the process/commandline.
apparently, this seems to be only case when the VM/disk is placed on btrfs,
i found this quirk in the source, i.e...
When I look at promox virtual disk settings , the default for virtual disk is „Default (No cache)“.
The wiki page at https://pve.proxmox.com/wiki/Performance_Tweaks is telling :
„cache=none seems to be the best performance and is the default since Proxmox 2.X.“
The file section in the...
via google search for btrfs and o_direct i found this wiki page
https://pve.proxmox.com/wiki/Special:WhatLinksHere/Storage:_BTRFS
that mentions the folloging important information
"BTRFS will honor the O_DIRECT flag when opening files, meaning VMsshould not use cache mode none, otherwise...
the problem with btrfs is that O_DIRECT has issues, see https://bugzilla.redhat.com/show_bug.cgi?id=1914433 for exampe.
so, you should not use cache=none for your virtual disks with proxmox
https://pve.proxmox.com/wiki/Storage:_BTRFS mentions that, i'm currently trying to find out, where that...
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