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| 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 | [05:41] |
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| mercutio | curious to know how you get on jbergstroem but no experience myself | [05:45] |
| jbergstroem | mercutio: testing locally has been positive, but we all know the effects of doing something a longer while in production :) | [05:51] |
| mercutio | yeh i wouldn't do it in production myself
cos that stuff changes the layout of hdd too right? | [05:51] |
| 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 | [05:52] |
| mercutio | zfs has the problem that it loses ssd cache when you reboot and it's complicated to split read/write on one ssd | [05:52] |
| jbergstroem | for instance, dscache actually caches writes | [05:52] |
| mercutio | write caching is bigger benefit when you have 32gb of ram
which is quite cheap to do now days | [05:53] |
| jbergstroem | yeah. i'm probalby going there instead
but for reads if you do raid1 (which i will).. gotta split. thanks for the feedback | [05:53] |
| 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? | [05:55] |
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| Hien | seem network lag..
few packets loss on my VPS | [07:43] |
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| jbergstroem | mercutio: sorry, 1 was a slip. i meant 0 (mirroring) | [14:06] |
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| mercutio | jbergstroem: mirroring is raid 1 not 0 ? | [18:11] |
| 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 :) | [18:15] |
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| 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 | [18:47] |
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