1. Yes, and writing out of KVM machines is always synchronous anyway as Robert mentioned before - all data goes to disks. 2. 5x mirrored vdevs (pair of 10K SAS drives) 10 drives in total
If I trhow async I/O at the same box I get around 700MB/s sustained I/O. It is a dual controller LSI2308, latest Haswell chipset server (we've received it today, haven't had much time to test yet) Cheers Peter On Mon, Jan 19, 2015 at 9:15 PM, Greg Zartman <[email protected]> wrote: > > On Sun, Jan 18, 2015 at 11:25 PM, Peter Toth <[email protected]> > wrote: > >> Just for reference: >> >> I have tested an Intel DC 3500 SSD as an slog device today - from a >> CentOS KVM guest doing dd with 64k block size. >> >> Average write speed 270MB/s - I think that speaks for itself. >> > Wow, yea that sounds more like it. Couple questions: > > 1. Did you do a write big enough to make sure you weren't just writing > RAM? > > 2. What's you zpool config and what kind of hardware you running? That > is, what kind of vdevs do you have? > > Thanks, > > Greg > ------------------------------------------- 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
