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 >>> >> >> >
