Date: Mon, 22 Jun 2015 16:04:56 -0700 From: Xin Li <delphij@delphij.net> To: kpneal@pobox.com, Quartz <quartz@sneakertech.com> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: ZFS raid write performance? Message-ID: <55889498.3090405@delphij.net> In-Reply-To: <20150622121343.GB60684@neutralgood.org> References: <5587C3FF.9070407@sneakertech.com> <20150622121343.GB60684@neutralgood.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 06/22/15 05:13, kpneal@pobox.com wrote: > For both reads and writes all levels of raidz* perform slightly > faster than the speed of a single drive. _Slightly_ faster, like, > the speed of a single drive * 1.1 or so roughly speaking. How big is the data block for each read-write? For large blocks RAID-Z is likely to perform nearly as well as stripped disks (e.g. 3 disks RAID-Z is slightly slower than 2 disk stripped, but would be much better than single disk pool). Typically copying data would use larger data blocks. For smaller writes it's likely to have worse results. > Finally, single GigE is _slow_. I see no point in a "landing pad" > when using unbonded GigE. How will a "landing pad" help when let's say we have 10GigE or even faster network connection? Cheers, - -- Xin LI <delphij@delphij.net> https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.5 (FreeBSD) iQIcBAEBCgAGBQJViJSYAAoJEJW2GBstM+nsVR0QAILGeNt4iT+mT1NeEEBiFtng wcdmzNHeUueSjRl/ecJl4O6UbDH/OAxrUwLTyj6/mP8J60JhfIZisrcnSYXCSYQL 6INTAFy8u+eD7ewMNYXr0PddDku3bsTKSC7zlSZKURctlkqX1gEatGLJDDhDMqJj KCcGpBnNX5CFS9y6UrCxbezoPwYlGf1CrEQooin5s5bLKWBwjBnG+XsaURtCOvXo aY6ctTHyKDhuDWfBlaSU73eaFAw6zjcjVvJh6BHVA3JZSwx5F4vFT9ahjpPSimvS h2byxrtSEi6PAIF+f7T+4zRoCqy+i2yYmnZlqHRQtGBtipF1cnzFlGQsGQtussE/ mamcXhcZDm2HbmxLyoUV15vNG4m/zvgMJK6VpMJrdbO5u/DfCDer/zuJyWJt6N/B Ytldb/a24WLpKEDtdUtkFw774GPOgXk8YEU/TN6lyxRx5Ua6wb8kB66npEZi3eMN tvdD45gKKVXmB5ooQjAiRzuOanKhDR40OBpCD1ZgNl513mSGJ0iNeJVGMzz2gakj 2r1GcRi+5DZTfcupc2NOLwe+8JM5B0QQzXCmuHS/eTdTGBBR4tfyIX8D5uxZs3wq 2CHPRg3yQxy0JOk14+q6g1uJfdiBjBt1SKF+gFD0TMuIFGEnREx6DpcNrJp3uPMF INYxVG0U2UUmTYIeM2iJ =CIqL -----END PGP SIGNATURE-----
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