On 4/7/2022 4:59 AM, [email protected] wrote:
Hi Mike!
Thanks a lot for your comment. I see. As said before, we didn't really
enable compression because we just keep the config as FreeBSD leaves
by default. Apart from that, having tons of disk space and well... for
avoiding the load of compress/decompress... The main reason was it was
not enabled by default really and not to have seen a real reason for
it.... was not more than that....I appreciate your comments really :)
Hi,
With respect to compression, I think there is a sweet spot
somewhere, where compression makes things faster if your disk IO is the
limiting factor and you have spare CPU capacity. I have a separate 13.x
zfs server with ztsd enabled and I get compression rations of 15:1 as it
stores a lot of giant JSON txt files.
Think of the extreme case where you do something like
dd if=/dev/zero of=/tank/junk.bin bs=1m count=10000
as this is a 20G file that takes just a few hundred bytes of write IO on
a compressed system. Obviously, as the compress ratio reduces in the
real world the benefits become less. Where that diminishing return is,
not sure. But something to keep in mind
---Mike
