On 18 Jun 2015 at 19:39:30, Richard Elling ([email protected]) wrote: > On Jun 17, 2015, at 3:48 AM, InterNetX - Juergen Gotteswinter ><[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? -Perttu ------------------------------------------- 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
