> Given the LSI 1078 based RAID card with 1 thread runs circles around the > P2000 with 4, 8, or 16 threads, and never stalls, with responses less > than 1ms, meaning all writes hit cache, it would seem other workloads > are hitting the P2000 simultaneously with your test, limiting your > performance. Either that or some kind of quotas have been set on the > LUNs to prevent one host from saturating the controllers. Or both. Maybe there exists a load quota of some kind as you are suggesting, but from what I've seen from screenshots in the installation manuals, I don't remember any of this. > This is why I asked about exclusive access. Without it your results for > the P2000 are literally worthless. Lacking complete configuration info > puts you in the same boat. You simply can't draw any realistic > conclusions about the P2000 performance without having complete control > of the device for dedicated testing purposes. That's a reasonable suggestion. Alas, I'm not expecting to get that level of access to the device. I know for a fact though, that it is only connected to a single machine, which is otherwise completely idle and controlled by "us" (the company I work for). But even so, I cannot set up XFS there on a whim because it's in preparation for production use. > You have such control of the P400 and LSI do you not? Concentrate your > testing and comparisons on those. The period of full control over the P400 is over, but at least I know how it is configured. The LSI is in production (meaning: untouchable), but seems reasonably configured. At least I have some multi-threaded results from the other two machines: LSI: 4 threads [ 2s] reads: 0.00 MB/s writes: 63.08 MB/s fsyncs: 0.00/s response time: 0.452ms (95%) [ 4s] reads: 0.00 MB/s writes: 34.26 MB/s fsyncs: 0.00/s response time: 1.660ms (95%) [ 6s] reads: 0.00 MB/s writes: 33.92 MB/s fsyncs: 0.00/s response time: 1.478ms (95%) [ 8s] reads: 0.00 MB/s writes: 36.34 MB/s fsyncs: 0.00/s response time: 1.589ms (95%) [ 10s] reads: 0.00 MB/s writes: 34.99 MB/s fsyncs: 0.00/s response time: 1.621ms (95%) [ 12s] reads: 0.00 MB/s writes: 36.41 MB/s fsyncs: 0.00/s response time: 1.639ms (95%) 8 threads [ 2s] reads: 0.00 MB/s writes: 45.34 MB/s fsyncs: 0.00/s response time: 2.749ms (95%) [ 4s] reads: 0.00 MB/s writes: 32.15 MB/s fsyncs: 0.00/s response time: 4.579ms (95%) [ 6s] reads: 0.00 MB/s writes: 33.64 MB/s fsyncs: 0.00/s response time: 4.644ms (95%) [ 8s] reads: 0.00 MB/s writes: 35.20 MB/s fsyncs: 0.00/s response time: 4.131ms (95%) [ 10s] reads: 0.00 MB/s writes: 33.88 MB/s fsyncs: 0.00/s response time: 3.876ms (95%) [ 12s] reads: 0.00 MB/s writes: 33.65 MB/s fsyncs: 0.00/s response time: 4.929ms (95%) 16 threads [ 2s] reads: 0.00 MB/s writes: 36.90 MB/s fsyncs: 0.00/s response time: 3.510ms (95%) [ 4s] reads: 0.00 MB/s writes: 35.36 MB/s fsyncs: 0.00/s response time: 8.629ms (95%) [ 6s] reads: 0.00 MB/s writes: 32.27 MB/s fsyncs: 0.00/s response time: 10.091ms (95%) [ 8s] reads: 0.00 MB/s writes: 34.79 MB/s fsyncs: 0.00/s response time: 9.499ms (95%) [ 10s] reads: 0.00 MB/s writes: 35.62 MB/s fsyncs: 0.00/s response time: 8.801ms (95%) [ 12s] reads: 0.00 MB/s writes: 34.64 MB/s fsyncs: 0.00/s response time: 9.488ms (95%) ... and so on. Nothing noteworthy after that. Response time is higher, throughput stays the same. P400: 4 threads [ 2s] reads: 0.00 MB/s writes: 33.59 MB/s fsyncs: 0.00/s response time: 0.255ms (95%) [ 4s] reads: 0.00 MB/s writes: 5.11 MB/s fsyncs: 0.00/s response time: 12.853ms (95%) [ 6s] reads: 0.00 MB/s writes: 5.45 MB/s fsyncs: 0.00/s response time: 0.677ms (95%) [ 8s] reads: 0.00 MB/s writes: 5.16 MB/s fsyncs: 0.00/s response time: 0.902ms (95%) [ 10s] reads: 0.00 MB/s writes: 4.56 MB/s fsyncs: 0.00/s response time: 58.242ms (95%) [ 12s] reads: 0.00 MB/s writes: 5.30 MB/s fsyncs: 0.00/s response time: 0.669ms (95%) [ 14s] reads: 0.00 MB/s writes: 5.22 MB/s fsyncs: 0.00/s response time: 0.743ms (95%) [ 16s] reads: 0.00 MB/s writes: 4.73 MB/s fsyncs: 0.00/s response time: 57.877ms (95%) [ 18s] reads: 0.00 MB/s writes: 4.39 MB/s fsyncs: 0.00/s response time: 58.417ms (95%) [ 20s] reads: 0.00 MB/s writes: 4.56 MB/s fsyncs: 0.00/s response time: 57.704ms (95%) [ 22s] reads: 0.00 MB/s writes: 4.81 MB/s fsyncs: 0.00/s response time: 57.429ms (95%) [ 24s] reads: 0.00 MB/s writes: 4.53 MB/s fsyncs: 0.00/s response time: 57.895ms (95%) Some response time fluctuation at first, but it settles quickly. 8 threads [ 2s] reads: 0.00 MB/s writes: 38.61 MB/s fsyncs: 0.00/s response time: 0.969ms (95%) [ 4s] reads: 0.00 MB/s writes: 4.98 MB/s fsyncs: 0.00/s response time: 59.886ms (95%) [ 6s] reads: 0.00 MB/s writes: 4.69 MB/s fsyncs: 0.00/s response time: 60.300ms (95%) [ 8s] reads: 0.00 MB/s writes: 4.57 MB/s fsyncs: 0.00/s response time: 60.246ms (95%) [ 10s] reads: 0.00 MB/s writes: 4.46 MB/s fsyncs: 0.00/s response time: 60.626ms (95%) [ 12s] reads: 0.00 MB/s writes: 4.46 MB/s fsyncs: 0.00/s response time: 60.445ms (95%) [ 14s] reads: 0.00 MB/s writes: 4.61 MB/s fsyncs: 0.00/s response time: 60.662ms (95%) [ 16s] reads: 0.00 MB/s writes: 4.35 MB/s fsyncs: 0.00/s response time: 60.571ms (95%) [ 18s] reads: 0.00 MB/s writes: 4.87 MB/s fsyncs: 0.00/s response time: 60.156ms (95%) [ 20s] reads: 0.00 MB/s writes: 4.77 MB/s fsyncs: 0.00/s response time: 60.210ms (95%) [ 22s] reads: 0.00 MB/s writes: 4.58 MB/s fsyncs: 0.00/s response time: 60.463ms (95%) [ 24s] reads: 0.00 MB/s writes: 4.65 MB/s fsyncs: 0.00/s response time: 60.264ms (95%) 16 threads [ 2s] reads: 0.00 MB/s writes: 17.35 MB/s fsyncs: 0.00/s response time: 7.764ms (95%) [ 4s] reads: 0.00 MB/s writes: 5.17 MB/s fsyncs: 0.00/s response time: 62.655ms (95%) [ 6s] reads: 0.00 MB/s writes: 5.15 MB/s fsyncs: 0.00/s response time: 62.749ms (95%) [ 8s] reads: 0.00 MB/s writes: 4.89 MB/s fsyncs: 0.00/s response time: 63.258ms (95%) [ 10s] reads: 0.00 MB/s writes: 4.98 MB/s fsyncs: 0.00/s response time: 62.862ms (95%) [ 12s] reads: 0.00 MB/s writes: 5.26 MB/s fsyncs: 0.00/s response time: 63.032ms (95%) [ 14s] reads: 0.00 MB/s writes: 5.27 MB/s fsyncs: 0.00/s response time: 62.599ms (95%) [ 16s] reads: 0.00 MB/s writes: 4.80 MB/s fsyncs: 0.00/s response time: 63.088ms (95%) [ 18s] reads: 0.00 MB/s writes: 4.84 MB/s fsyncs: 0.00/s response time: 63.239ms (95%) [ 20s] reads: 0.00 MB/s writes: 5.24 MB/s fsyncs: 0.00/s response time: 62.712ms (95%) [ 22s] reads: 0.00 MB/s writes: 4.25 MB/s fsyncs: 0.00/s response time: 63.619ms (95%) [ 24s] reads: 0.00 MB/s writes: 4.90 MB/s fsyncs: 0.00/s response time: 63.202ms (95%) Pretty boring. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
