Thanks for that list Keith (http://eng.joyent.com/manufacturing). For everyone who hasn't read it yet I do recommend you to do so. I'm guessing joyent has gone through a huge amount of different vendors before deciding on these documented part numbers.
What I notice though is that joyent doesnt seem to use any L2ARC ssd's. Is this true ? And if so, why? My guess is that all their systems always have enough ram to make any L2ARC negligible and therefore unnecessary. Please correct me if I am wrong and especially if joyent does use l2arc SSD's. On Thu, May 8, 2014 at 4:13 PM, Keith Wesolowski via smartos-discuss < [email protected]> wrote: > On Thu, May 08, 2014 at 07:55:25AM -0400, Steven McDowall via > smartos-discuss wrote: > > > I am curious as to why having 2 different drives (for SLOG and for > L2ARC) is a good idea? I've been reading the series > > > > > https://pthree.org/2012/12/07/zfs-administration-part-iv-the-adjustable-replacement-cache/ > > I'd be skeptical of ZFS advice from someone who doesn't know that the > ARC is the *adaptive* replacement cache, especially since even Wikipedia > knows that. > > The short answer is that the two workloads are markedly different, and > SSDs are designed and marketed for different workloads. You can pretty > well buy disk "by the litre" today, but that's not at all the case with > SSDs. > > To the original question, the parts we use at Joyent can always be found > at http://eng.joyent.com/manufacturing. Those are the ones with which > we have direct experience and in which we have the most confidence. We > always recommend using our Certified configurations. Notice that we > don't use L2ARC; demand for it in JPC has been limited to nonexistent (I > wonder if you're really sure you need it). > > I should also mention that the Mach16 is EOL and HGST/STEC have not come > out with a replacement for it (Keith's pet peeve #464: vendors who EOL > good hardware without providing a similar replacement). As such, you > may have difficulty sourcing that part. The S840z is a fine substitute > for it in the same form factor, and is much faster; however, it's also > much more expensive. HGST has unfortunately put me in a situation where > I am unable to recommend any of their products for use as a slog in the > same price range as the Mach16. Unless they come out with something > great later this year, we'll probably be stuck with the DCS3700. > > > And it seems like how A Toponce does it makes sense : get 2 good > quality (but not necessarily large) SSDs and partition them into 2 areas: > one "fairly" small for the SLOG and the other larger partition for the > L2ARC ... ?? > > > > In his case he did 5GB for the SLOG and the rest (45GB) for the Cache .. > > > > Seems like a good use of resources? > > No, but not only have I already explained why, someone has helpfully > quoted me doing so! > > > ------------------------------------------- > smartos-discuss > Archives: https://www.listbox.com/member/archive/184463/=now > RSS Feed: > https://www.listbox.com/member/archive/rss/184463/25260607-2c0779a6 > Modify Your Subscription: > https://www.listbox.com/member/?&; > Powered by Listbox: http://www.listbox.com > -- Ibrahim Tachijian ------------------------------------------- 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
