On 1/18/15 19:52 , Greg Zartman via smartos-discuss wrote: > On Sun, Jan 18, 2015 at 5:36 PM, Ian Collins <[email protected]> wrote: > >> Are you using the 200G 3700s because of the increased performance over the >>> 100G 3700s? >>> >> >> Yes, they have double the IOPs. > > > Thanks Ian. I'll add one of these SSDs to my zpool and report back. The > current setup is 8x1TB western digital drives configured in 4 sets of raid > 1 mirrors. I have twin SAS cards in this box cross-flashed to work well > with ZFS. This should be about the fastest config we can get.
While it's obvious that if you're doing a lot of synchronous writes that doing disk I/O and waiting for it to synch to normal hard drives will be a bottleneck, you'll want to make sure that's actually the case. In general, the wins from a slog are worth it; however, it's important to always verify *where* your performance problems ultimately are coming from. So, just make sure you do do that. You'd have to be in a case where, for example, you set a cpu share or cap that was causing excessive throttling and LAT. 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
