#arpnetworks 2013-04-30,Tue

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WhoWhatWhen
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jbergstroemdoes anyone have experience with bcache/flashcache? considering deploying a rig at arpnetworks with a ssd cache, but have only played with the technology for a month or three [05:41]
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mercutiocurious to know how you get on jbergstroem but no experience myself [05:45]
jbergstroemmercutio: testing locally has been positive, but we all know the effects of doing something a longer while in production :) [05:51]
mercutioyeh i wouldn't do it in production myself
cos that stuff changes the layout of hdd too right?
[05:51]
jbergstroemzfs is just superior here. using l2arc for a long time; just friggin works. i've disconnected the ssd multiple times, as well as parts of my raid.
not really. its supposed to act as a pure cache, but bcache, flashcache and the new dscache (3.9) works a bit different
[05:52]
mercutiozfs has the problem that it loses ssd cache when you reboot and it's complicated to split read/write on one ssd [05:52]
jbergstroemfor instance, dscache actually caches writes [05:52]
mercutiowrite caching is bigger benefit when you have 32gb of ram
which is quite cheap to do now days
[05:53]
jbergstroemyeah. i'm probalby going there instead
but for reads if you do raid1 (which i will)..
gotta split. thanks for the feedback
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mercutioraid 1 with linux you want to use far
far=2 or something i can't remember exact
but normally raid1 doesn't give much perforamnce benefit
unless you do that then it stripes fast/slow parts of the disks together
mind you that could slow down writes i imagine?
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Hienseem network lag..
few packets loss on my VPS
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jbergstroemmercutio: sorry, 1 was a slip. i meant 0 (mirroring) [14:06]
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mercutiojbergstroem: mirroring is raid 1 not 0 ? [18:11]
jbergstroemmercutio: your reply confused me (since i thought you referred to stripe while mentioning performance benefits), so i assumed i did a typo. and, i replied in the middle of the night :) [18:15]
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mercutiojbergstroem: oh true,
jbergstroem: normal zfs will read from disks alternating
in raid 1
but not write, and you were said about read benefits of raid 1 rather than read and write
i'm not sure what linux raid does, but with far=2 it uses the first half of each disk afaik
http://serverfault.com/questions/139022/explain-mds-raid10-f2
that explains it well it seems
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