ceph osd dump, please. 10 янв. 2014 г. 18:29 пользователь "Steffen Thorhauer" < [email protected]> написал:
> On 01/10/2014 02:35 PM, Wido den Hollander wrote: > > > > > > Op 10 jan. 2014 om 18:49 heeft "Steffen Thorhauer" < > [email protected]> het volgende geschreven: > > On 01/10/2014 01:21 PM, Ирек Фасихов wrote: > > You need to use VirtIO. > > <target dev='*vdb*' bus='*virtio*'/> > > > with this parameter ist not a real performance increase: > dd if=/dev/zero of=zerofile-2 bs=1G count=8 > 8+0 records in > 8+0 records out > 8589934592 bytes (8.6 GB) copied, 73.8425 s, 116 MB/s > > and reading: > > trompete@multius:~$ dd if=zerofile-2 of=/dev/null bs=1G count=8 > 8+0 records in > 8+0 records out > 8589934592 bytes (8.6 GB) copied, 429.528 s, 20.0 MB/s > > > What happens if you increase the read_ahead_kb value for the device to > 4096k. That is inside the guest. > > > cat read_ahead_kb > 65536 > > trompete@multius:~$ dd if=zerofile-2 of=/dev/null bs=1G count=8 > 8+0 records in > 8+0 records out > 8589934592 bytes (8.6 GB) copied, 382.148 s, 22.5 MB/s > > > -- > ______________________________________________________________________ > Steffen Thorhauer > > Department of Technichal and Business Information Systems (ITI) > Faculty of Computer Science (FIN) > Otto von Guericke University Magdeburg > Universitaetsplatz 2 > 39106 Magdeburg, Germany > > phone: 0391 67 52996 > fax: 0391 67 12341 > email: [email protected] > url: http://wwwiti.cs.uni-magdeburg.de/~thorhaue > >
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