#ceph IRC Log

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IRC Log for 2012-12-02

Timestamps are in GMT/BST.

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[9:51] <Psi-jack> When setting up Ceph to use Btrfs, is it better to have Btrfs utilize it's own native raid10, dup, or default?
[9:51] <Psi-jack> Considering also that the main storage will be plattered drives, and the journal will be on SSD.
[9:51] <Psi-jack> Hi-speed SSD with Synchronous MLC NAND.
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[13:13] <phantomcircuit> i have the journal on an ssd which can do ~14k IOPS
[13:13] <phantomcircuit> the rest of the osd is on a conventional hdd
[13:13] <phantomcircuit> qemu-kvm instance with device as rbd device can only do ~100 write operations/second
[13:14] <phantomcircuit> that seems wrong
[13:14] <phantomcircuit> oh wait
[13:14] <phantomcircuit> silly me that's my fault nvm
[13:15] <phantomcircuit> no even removing the cgroup io throttling im still only getting 170 IOPS
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[13:19] <phantomcircuit> which not so coincidentally is what i get from the raw disk
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[17:57] <darkfaded> fyi http://ceph.com/docs/master/rados/operations/add-or-rm-osds/ has a link to filesystem recommendations which is not working
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[18:09] <darkfaded> http://ceph.com/docs/master/rbd/rbd/ link to rbd caching not working
[18:09] <darkfaded> maybe you need to let something automatic do that :)
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[18:27] <darkfaded> sigh :> i've made a 2GB rbd image and formatted it with xfs and then tested copying, 20, 50, 500MB, all fine
[18:27] <darkfaded> then i added conv=fdatasync to my dd and it's gone :>
[18:28] <darkfaded> well, gone not, but not doing anything
[18:28] * darkfaded is a murderer now, killed poor testbed yet another tiem
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[23:38] <mythzib> hello
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