> On Jun 19, 2015, at 2:06 PM, Perttu <[email protected]> wrote: > > On 18 Jun 2015 at 19:39:30, Richard Elling ([email protected] > <mailto:[email protected]>) wrote: >> > On Jun 17, 2015, at 3:48 AM >> > <http://airmail.calendar/2015-06-17%2003:48:00%20EEST>, InterNetX - >> > Juergen Gotteswinter <[email protected] <mailto:[email protected]>> >> > wrote: >> > >> > With with default Settings you will end up in Caching everything twice >> > with ZFS inside the Guest. >> >> This statement is true for every file system, except maybe HSFS or FAT16. In >> and of itself, >> this is not enough of a reason to use or not use any particular file system. >> >> > >> > Either use some regular, legacy FS or change primary/secondarycache to >> > Metadata only >> >> Again, these are not likely to be important. The reason is that to the >> underlying ZFS, the >> data cached in the KVM client is only seen once. This means it gets in the >> MRU side of >> the ARC and is thus more likely to be evicted first. Inside the KVM client, >> if running ZFS >> then the hot data will be cached in the MFU side of the ARC. In other words, >> the concept >> of double-caching is not a binary choice and for a busy server with memory >> pressure, >> you can expect that most data won't be double-cached. >> -- richard > > Thanks Richard, I’m still digesting your comments. What sort of settings > would you suggest if testing ZFS inside guest OS? > >
It should function fine. If you want to do testing, then I suggest using the workload you wish to use in production. Meanwhile, you can look at the arcstats to see the cache usage in both the client and global zone. -- richard > -Perttu > > smartos-discuss | Archives > <https://www.listbox.com/member/archive/184463/=now> > <https://www.listbox.com/member/archive/rss/184463/21953302-fd56db47> | > Modify <https://www.listbox.com/member/?&;> Your Subscription > <http://www.listbox.com/> ------------------------------------------- smartos-discuss Archives: https://www.listbox.com/member/archive/184463/=now RSS Feed: https://www.listbox.com/member/archive/rss/184463/25769125-55cfbc00 Modify Your Subscription: https://www.listbox.com/member/?member_id=25769125&id_secret=25769125-7688e9fb Powered by Listbox: http://www.listbox.com
