Hi,
we have done some testing with bluestore and found that the memory consumption of the osd
processes is depending not on the real data amount stored but on the number of stored
objects.
This means that e.g. a block device of 100 GB which spreads over 100 objects has a different
memory usage than storing 10000000 smaller objects (the bluestore blocksize should be tuned for
that kind of setup). (1000000 objects of size 4k to 100k had a memory consumption of ~4GB on the osd
on standard block size, while the amount of data was only ~15GB).
So it depends on the usage, a cephfs stores each file as a single object, while the rbd is configured
to allocate larger objects.
Marcus Haarmann
Von: "Stijn De Weirdt" <stijn.deweirdt@xxxxxxxx>
An: "ceph-users" <ceph-users@xxxxxxxxxxxxxx>
Gesendet: Donnerstag, 10. August 2017 10:34:48
Betreff: luminous/bluetsore osd memory requirements
An: "ceph-users" <ceph-users@xxxxxxxxxxxxxx>
Gesendet: Donnerstag, 10. August 2017 10:34:48
Betreff: luminous/bluetsore osd memory requirements
hi all,
we are planning to purchse new OSD hardware, and we are wondering if for
upcoming luminous with bluestore OSDs, anything wrt the hardware
recommendations from
http://docs.ceph.com/docs/master/start/hardware-recommendations/
will be different, esp the memory/cpu part. i understand from colleagues
that the async messenger makes a big difference in memory usage (maybe
also cpu load?); but we are also interested in the "1GB of RAM per TB"
recommendation/requirement.
many thanks,
stijn
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ceph-users@xxxxxxxxxxxxxx
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we are planning to purchse new OSD hardware, and we are wondering if for
upcoming luminous with bluestore OSDs, anything wrt the hardware
recommendations from
http://docs.ceph.com/docs/master/start/hardware-recommendations/
will be different, esp the memory/cpu part. i understand from colleagues
that the async messenger makes a big difference in memory usage (maybe
also cpu load?); but we are also interested in the "1GB of RAM per TB"
recommendation/requirement.
many thanks,
stijn
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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