4 ms·

I have the same problem. Sometimes it just drops the whole cache suddenly and I don't have a clue why: https://walkman.cloud/s/zXLp7DF9sDFwr7z https://walkman.c

• blackflame7000 7y ago
  An L2ARC is simply a cache of files that you have randomly accessed recently. I wonder if at 2 am files haven't been accessed in some cleanup period and it begins purging itself. Here's a link to other possible reasons. http://www.brendangregg.com/blog/2008-07-22/zfs-l2arc.html http://www.brendangregg.com/blog/2008-07-22/zfs-l2arc.html
• rincebrain 7y ago
  You may find it informative to graph MRU/MFU - I suspect you will find that the MRU is being dumped. [1] I personally can't decide whether I think it's a bug or not, since if the MRU is all old items there is an argument to be had that you don't want it in cache any more...but dumping 100% of it strikes me as a bug either way. :) [1] - https://github.com/zfsonlinux/zfs/issues/7820 https://github.com/zfsonlinux/zfs/issues/7820