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dj_goku has quit IRC (Ping timeout: 252 seconds) jbergstroem: does 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 ***: heavysixer has joined #arpnetworks
ChanServ sets mode: +o heavysixer mercutio: curious to know how you get on jbergstroem but no experience myself jbergstroem: mercutio: testing locally has been positive, but we all know the effects of doing something a longer while in production :) mercutio: yeh i wouldn't do it in production myself
cos that stuff changes the layout of hdd too right? jbergstroem: zfs 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 mercutio: zfs has the problem that it loses ssd cache when you reboot and it's complicated to split read/write on one ssd jbergstroem: for instance, dscache actually caches writes mercutio: write caching is bigger benefit when you have 32gb of ram
which is quite cheap to do now days jbergstroem: yeah. i'm probalby going there instead
but for reads if you do raid1 (which i will)..
gotta split. thanks for the feedback mercutio: raid 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? ***: heavysixer has quit IRC (Quit: heavysixer)
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Webhostbudd has joined #arpnetworks Hien: seem network lag..
few packets loss on my VPS ***: ziyourenxiang has quit IRC (Quit: ziyourenxiang)
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ChanServ sets mode: +o mhoran2 jbergstroem: mercutio: sorry, 1 was a slip. i meant 0 (mirroring) ***: fink has quit IRC (Quit: fink)
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heavysixer has quit IRC (Quit: heavysixer) mercutio: jbergstroem: mirroring is raid 1 not 0 ? jbergstroem: mercutio: 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 :) mercutio: jbergstroem: 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 ***: aslr has quit IRC (Ping timeout: 272 seconds)
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