Re: Effect of disk caching on performance

2019-03-13 Thread Andrija Panic
https://doc.opensuse.org/documentation/leap/virtualization/html/book.virt/cha.cachemodes.html On Wed, 13 Mar 2019 at 15:48, Fariborz Navidan wrote: > What is difference between NONE and WRITE THROUGH? > > On Wed, Mar 13, 2019 at 7:10 PM Andrija Panic > wrote: > > > Not sure how this directly ha

Re: Effect of disk caching on performance

2019-03-13 Thread Fariborz Navidan
What is difference between NONE and WRITE THROUGH? On Wed, Mar 13, 2019 at 7:10 PM Andrija Panic wrote: > Not sure how this directly has anything to do with CloudStack - it's > standalone Hypervisor thing :) >

Re: Effect of disk caching on performance

2019-03-13 Thread Andrija Panic
Not sure how this directly has anything to do with CloudStack - it's standalone Hypervisor thing :)

Re: Effect of disk caching on performance

2019-03-13 Thread Ivan Kudryavtsev
Hi, Fariborz. Several days ago there was a discussion about it. "NONE" or "WRITETHROUGH" must be used when possible. WRITEBACK may be used __ONLY__ if you don't care about data loss, e.g. ephemeral VMS which destroyed upon the crash. Add more RAM to VM, implement bcache or LVMcache, add more drive

Effect of disk caching on performance

2019-03-13 Thread Fariborz Navidan
Hello All, How does disk caching affects the VM's performance? If yes, which type of disk caching do you advise? Thanks