Do we have anyone using the s3700 in their pools with any kind of scale?
I picked up an eval from dell using an r820 4x4650L, 576GB of RAM, and 8 dc s3700 drives on OI151a8. Testing with filebench and the random write personality indicates one device pushes 14k 8kb write operations/second. I really thought it would turn out more but the news gets worse. As I expand the number of devices in the spool (stripped), the performance actually degrades. The pool config alternates devices against two lsi 9207-8i cards in round robin. Test results look like this for 8kb random writes using 64 writer threads and a single instance of filebench: Spans | write ops/s uncompressed | write ops/s lzjb 1 | 10k/s | 14k/s 2 | 16k/s | 24k/s 3 | 18k/s | 24k/s 4 | 18k/s | 20k/s 5 | 18k/s | 20k/s 6 | 18k/s | 21k/s Conversely, I have OI151a1 systems with Intel 910 drives that write out 56k 8k ops using the same profile. I know the mpt driver changed between a1 and 8a but if it was this slow someone would have noticed it by now. I am clearly bottlenecked some where. In theory, this is the top of midrange hardware. I have tried adjustments to zfs_vdev_max_pending, zfs_txg_timeout, zfs_txg_synctime but none of that has made much of a difference. Are there any ideas out there? j.
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