[SOLVED] BMLIMIT for ZSTD backups

[Proxygen]

I know I can use

zstd: N

and I have

BWLIMIT: 49152

set in /etc/vzdump.conf, but I am not sure zstd takes bwlimit in consideration. the process executing the back shows

... cstream -t 50331648 | zstd --rsyncable '--threads=2' ...

I need to lower the bandwidth bc it's straining the disk and applications are unable to perform well (CPU usage is over # of cores). I have been using zstd for almost 1 year and it has worked well (CPU usage stays reasonable) but since the last PVE update (which asked to implement a new template for vzdump.conf) something related to the backup changed. I can't say this is to blame for sure, so the question is how to limit bandwidth for vzbackups when using zstd?

 

[fabian]

the cstream -t 50331648 is the limit taking place (before the data hits zstd, so the effect should be even bigger since it works on the uncompressed backup stream )

 

[Proxygen]

the cstream -t 50331648 is the limit taking place (before the data hits zstd, so the effect should be even bigger since it works on the uncompressed backup stream )

yes, cstream, but how does 50331648 relate to 49152? and where do i set the 50331648

 

[dcsapak]

50331648 B / 1024 = 49152 KiB