Also in that video - it's long but worth watching We tested up to 1M reads/second as well, blowing out page cache to ensure we weren't "just" reading from memory
-- Jeff Jirsa > On Jan 31, 2016, at 9:52 AM, Jack Krupansky <jack.krupan...@gmail.com> wrote: > > How about reads? Any differences between read-intensive and write-intensive > workloads? > > -- Jack Krupansky > >> On Sun, Jan 31, 2016 at 3:13 AM, Jeff Jirsa <jeff.ji...@crowdstrike.com> >> wrote: >> Hi John, >> >> We run using 4T GP2 volumes, which guarantee 10k iops. Even at 1M writes per >> second on 60 nodes, we didn’t come close to hitting even 50% utilization >> (10k is more than enough for most workloads). PIOPS is not necessary. >> >> >> >> From: John Wong >> Reply-To: "user@cassandra.apache.org" >> Date: Saturday, January 30, 2016 at 3:07 PM >> To: "user@cassandra.apache.org" >> Subject: Re: EC2 storage options for C* >> >> For production I'd stick with ephemeral disks (aka instance storage) if you >> have running a lot of transaction. >> However, for regular small testing/qa cluster, or something you know you >> want to reload often, EBS is definitely good enough and we haven't had >> issues 99%. The 1% is kind of anomaly where we have flush blocked. >> >> But Jeff, kudo that you are able to use EBS. I didn't go through the video, >> do you actually use PIOPS or just standard GP2 in your production cluster? >> >>> On Sat, Jan 30, 2016 at 1:28 PM, Bryan Cheng <br...@blockcypher.com> wrote: >>> Yep, that motivated my question "Do you have any idea what kind of disk >>> performance you need?". If you need the performance, its hard to beat >>> ephemeral SSD in RAID 0 on EC2, and its a solid, battle tested >>> configuration. If you don't, though, EBS GP2 will save a _lot_ of headache. >>> >>> Personally, on small clusters like ours (12 nodes), we've found our choice >>> of instance dictated much more by the balance of price, CPU, and memory. >>> We're using GP2 SSD and we find that for our patterns the disk is rarely >>> the bottleneck. YMMV, of course. >>> >>>> On Fri, Jan 29, 2016 at 7:32 PM, Jeff Jirsa <jeff.ji...@crowdstrike.com> >>>> wrote: >>>> If you have to ask that question, I strongly recommend m4 or c4 instances >>>> with GP2 EBS. When you don’t care about replacing a node because of an >>>> instance failure, go with i2+ephemerals. Until then, GP2 EBS is capable of >>>> amazing things, and greatly simplifies life. >>>> >>>> We gave a talk on this topic at both Cassandra Summit and AWS re:Invent: >>>> https://www.youtube.com/watch?v=1R-mgOcOSd4 It’s very much a viable >>>> option, despite any old documents online that say otherwise. >>>> >>>> >>>> >>>> From: Eric Plowe >>>> Reply-To: "user@cassandra.apache.org" >>>> Date: Friday, January 29, 2016 at 4:33 PM >>>> To: "user@cassandra.apache.org" >>>> Subject: EC2 storage options for C* >>>> >>>> My company is planning on rolling out a C* cluster in EC2. We are thinking >>>> about going with ephemeral SSDs. The question is this: Should we put two >>>> in RAID 0 or just go with one? We currently run a cluster in our data >>>> center with 2 250gig Samsung 850 EVO's in RAID 0 and we are happy with the >>>> performance we are seeing thus far. >>>> >>>> Thanks! >>>> >>>> Eric >
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