January 2019
Intermediate to advanced
606 pages
15h 1m
English
book
Ceph: Designing and Implementing Scalable Storage Systems
by Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk
Content preview from Ceph: Designing and Implementing Scalable Storage Systems
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How to do it...
Let's benchmark single disk read performance:
- Drop caches:
# echo 3 > /proc/sys/vm/drop_caches
- Use dd to read from the file, deleteme, which we created during the write test. We will read the deleteme file to /dev/null with iflag set to direct:
# dd if=/var/lib/ceph/osd/ceph-0/deleteme of=/dev/null bs=10G count=1 iflag=direct
Ideally, you should repeat step 1 and step 2 a few times and take the average value. In our case, the average value for read operations comes to be 133 MB/s, as shown in the following screenshot:
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