On 1/17/15 21:47 , Greg Zartman via smartos-discuss 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.
In this case, you need to make sure you're doing an apples to oranges comparison. By default all disk I/O that a KVM instance does is synchronous I/O. If your test in the global zone isn't doing synchronous I/O, then it's not going to be a like for like comparison. How are you performing your comparisons? If you don't have a slog in your machine, and you care about guest I/O performance, then I'd look at that. > 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?? It bypasses the virto disk driver; however, it instead uses the virtio networking driver to transmit the RPC requests. Robert ------------------------------------------- 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
