On May 8, 2014, at 7:51 AM, Ibrahim Tachijian via smartos-discuss <[email protected]> wrote:
> 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. I can't speak for Joyent, but the age when L2ARC was invented was also an age where RAM was very expensive and limited. Think along the lines of "a big machine has 16 GB." Today, 16GB of ECC memory fits in one slot and costs less than $200. For caches, the return on investment is marginal, which means doubling the cache size doesn't double performance. For today's systems, putting in 256GB of RAM and not purchasing an L2ARC is a very sensible approach for many workloads. Higher end filers have 1-2 TB of RAM, for reference. -- richard -- [email protected] +1-760-896-4422 ------------------------------------------- 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
