Date: Wed, 21 Dec 2011 20:05:57 -0600 From: Mark Felder <feld@feld.me> To: freebsd-geom@freebsd.org Subject: RFC: GEOM MULTIPATH Rewrite Message-ID: <7bf62b8af857803e03363b81ead54484@feld.me>
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Hi all, Building dual ZFS SANs at work with this hardware: HP DL360 head units // 18GB RAM // Intel SSDs for zil/cache LSI SAS 9201-16e DataOn Storage DL-1630 with dual controllers filled with 2TB SATA Hitachis + LSI SAS transposers I originally installed FreeBSD but my fight with gmultipath was not going well. I wasn't happy that it didn't have ACTIVE/ACTIVE and I also was discouraged by the ability to make it panic. I flirted briefly with OpenIndiana, but that whole platform needs to die as it's so painful to use. The weirdly horrible interactivity wasn't confidence-inspiring either -- why did it take 10 seconds to display "top"? Why were ZFS pool operations so slow? Very strange! This morning I found you actually released gmultipath patches and I must say -- this works FANTASTIC now! I can be writing 500MB/s+ and pull the cables at random and it's nearly transparent in passive and active modes. I urge you to commit this so it gets more testing, but I will be putting FreeBSD9 + gmultipath in production soon. I just need to do some more benchmarks and I might switch the scheduler to 4BSD because this box will be doing nothing but I/O and network traffic and my research indicates ULE is not optimal in that type of a workload. Cheers, Mark
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