On Tue, Jan 13, 2015 at 9:05 AM, <[email protected]> wrote: > Hi Chip, > > Thanks for the quick response and interesting recommendation. > > To take advantage of the garbage collection, should I stay below 80% for > the whole z-volume or individual zfs (or zone) quote? >
The entire z-volume. I don't use SmartOS much so I'm not positive on it's procedure for the root pool. The AnandTech article is at: http://www.anandtech.com/show/6489/playing-with-op Ever since this article their SSD reviews tend to have over provisioning performance testing. I have a blog post about slicing that includes the format commands to slice the SSD: http://www.bigdatajunkie.com/index.php/9-solaris/zfs/10-short-stroking-consumer-ssds -Chip Can you please provide the link to the article on AnandTech? > I'd like to learn more about the garbage collection procedure for SSD. > > Regards, > Alexei > > > > Trim is not in Illumos kernel yet, however you can get the same > > performance > > gain by only using 80-90% of the SSD in a slice and letting the garbage > > collection clean up overwritten sectors. > > > > Some SSDs do this better than others. Intel and Samsung seem to be the > > best at garbage collection. > > > > AnandTech has some good articles on this. I've gotten great long running > > performance out of Samsung 840 Pros at 80%. > > > > You will also benefit by having a log device for your SSD pools. Even > > those with power safe caches suffer from the log being in the pool. > > > > -Chip > > > > On Mon, Jan 12, 2015 at 5:56 PM, <[email protected]> > > wrote: > > > >> Greetings, > >> > >> I have the root volume with several I/O intensive zones on an SSD drive. > >> Updating a file in one of the zones is noticeably going slow in > >> comparison > >> how it was several months ago, while the file size hasn't changed much. > >> I > >> suspect the SSD may need trimming. > >> Is the TRIM not available yet in smartos? > >> If so, what would be the right procedure of migrating the root volume > >> with > >> its zones/* onto the different drive? > >> > >> Thanks, > >> Alexei > >> > >> > >> > >> ------------------------------------------- > >> smartos-discuss > >> Archives: https://www.listbox.com/member/archive/184463/=now > >> RSS Feed: > >> https://www.listbox.com/member/archive/rss/184463/26131723-5e6842d7 > >> Modify Your Subscription: > >> > https://www.listbox.com/member/?&; > >> Powered by Listbox: http://www.listbox.com > >> > > > > > ------------------------------------------- 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
