Hi We have a bunch of Samsung EVO 840's that we are trying to use as log devices on some old nodes to give them a bit of life.
The nodes are using an LSI 2008 controller and run well. When we add the EVO as an slog device writes max out at 30Mb/s. We then swapped the log for an Intel DC3700 and got 200MB's on the pool. We added the EVO to a pool on its own and we get 350 Mb/s plus write speeds just checking that it performs and it does. The only thing we noticed is that the EVO has 8K blocks (ashift = 13) but in both scenarios as the log device and in the pool itself zfs sets ashift = 9, so that does not appear to be the issue. Any pointers on where to investigate would be much appreciated ? Thanks Andre -- Andre Sachs CloudAfrica t: 076 333 1883 ------------------------------------------- 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
