Hi Greg This question comes up from time to time and there have been some discussions previously:
https://github.com/joyent/smartos-live/issues/320 Essentially what your seeing (by and large) is the impact of synchronous writes to the ZFS filesystem. KVM machines perform all of their writes synchronously (reasons are detailed in that link) and if I remember correctly, NFS writes will also be synchronous by default. The standard way of accelerating your writes is to have a SLOG (separate log device/ZIL device) such as an SSD in the pool. Thanks, Dave On 18 Jan 2015, at 3:47 pm, Greg Zartman via smartos-discuss <[email protected]<mailto:[email protected]>> wrote: I'm curious if anyone has some general read/write speeds for a Centos VM running on smartOS. I know there are alot of variables to this question, but I'm just looking for general numbers. I've created a Centos VM and then mounted zfs a couple zfs volumes using nfs thinking I may get better disk speed than putting this data on the centos filesystems on top of zfs. However, I'm just seeing around 60MB/s in the VM, but north of 300MB/s in the headzone to this zfs volume. I'm wondering if this is the virto driver or if I'm really losing this much to nfs. I thought that using nfs would bypass the virto drive, but maybe it doesnt?? Thanks, Greg J. Zartman, P.E. smartos-discuss | Archives<https://www.listbox.com/member/archive/184463/=now> [https://www.listbox.com/images/feed-icon-10x10.jpg10f3ec5.jpg?uri=aHR0cHM6Ly93d3cubGlzdGJveC5jb20vaW1hZ2VzL2ZlZWQtaWNvbi0xMHgxMC5qcGc] <https://www.listbox.com/member/archive/rss/184463/25738179-216c4b5f> | Modify<https://www.listbox.com/member/?&;> Your Subscription [https://www.listbox.com/images/listbox-logo-small.png10f3ec5.png?uri=aHR0cHM6Ly93d3cubGlzdGJveC5jb20vaW1hZ2VzL2xpc3Rib3gtbG9nby1zbWFsbC5wbmc] <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
