We have a Parallels Cloud server with 5 Nodes. After updating PCS 6.0 Update 8 from Hotfix 2 to Hotfix, 8 we have noticed a big difference in RAM used. Until hotfix 2 there was plenty of RAM available. After updating to hotfix 8, we see that almost all available RAM is used, and actually it is cached: Code: # free -m total used free shared buffers cached Mem: 257783 238623 19159 1061 17385 187037 -/+ buffers/cache: 34199 223583 Swap: 51199 13921 37278 As far as I understand, it is not bad that the Ram is used from cache, but I would like to know if this happened because of the update, or there is some other explanation. I read the release notes of every update but I didn't find anything about ram usage.