I don't know. What we know is that the sync write performance of zil drive is awful if cache-nonvolatile:true is not set.
On Mon, Jan 23, 2017 at 12:30 PM, Robert Mustacchi <r...@joyent.com> wrote: > On 1/23/17 9:20 , Youzhong Yang wrote: > > it is power safe and we've tested it here. > > > > https://toshiba.semicon-storage.com/us/product/ > storage-products/enterprise-ssd/px02smb-px02smfxxx.html?sug=1 > > Sure, it does say it's power safe. Are you sure that means you don't > need to issue synchronize cache commands to the device? For some > devices, you still need to issue synchronize cache commands even if > they're power safe. If it works, great. Hopefully that just means > synchronize cache commands are a no-op. > > Robert > > > On Mon, Jan 23, 2017 at 12:01 PM, Robert Mustacchi <r...@joyent.com> > wrote: > > > >> On 1/23/17 6:29 , Youzhong Yang wrote: > >>> Add something like this to /kernel/drv/sd.conf: > >>> > >>> "TOSHIBA PX02SMF020 ", "cache-nonvolatile:true", > >>> > >>> I don't think the sd.conf comes with smartos image has it, so you need > to > >>> build your own image. > >> > >> In general, you should _never_ set this value. You have basically told > >> the system that this device is power safe and never requires a > >> synchronize cache command. This is not true for most devices and a > >> poorly timed panic will result in data loss on the one device whose > >> purpose is to protect its data: the slog. > >> > >> Note, when I generally talk about an SSD being power safe, that does not > >> mean that this can be set to true. The devices generally only guarantee > >> that data is safe after a synchronize cache command. > >> > >> I don't have as much experience with these Toshiba drives, so it may be > >> that their datasheet tells you something else in this case. > >> > >> 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
