Hy,
I use the 0.64.1 version of CEPH on debian wheezy for serveur and ubuntu
precise ( with raring kernel 3.8.0-25 ) as client.
My problem is the distribution of data on the cluster. I have 3 servers
each with 6 osd, but the distribution is very heterogeneous :
86% /var/lib/ceph/osd/ceph-15
67% /var/lib/ceph/osd/ceph-13
95% /var/lib/ceph/osd/ceph-14
92% /var/lib/ceph/osd/ceph-17
86% /var/lib/ceph/osd/ceph-12
20% /var/lib/ceph/osd/ceph-16
47% /var/lib/ceph/osd/ceph-10
85% /var/lib/ceph/osd/ceph-11
67% /var/lib/ceph/osd/ceph-6
86% /var/lib/ceph/osd/ceph-8
29% /var/lib/ceph/osd/ceph-9
64% /var/lib/ceph/osd/ceph-2
68% /var/lib/ceph/osd/ceph-0
86% /var/lib/ceph/osd/ceph-3
67% /var/lib/ceph/osd/ceph-4
79% /var/lib/ceph/osd/ceph-1
58% /var/lib/ceph/osd/ceph-18
Friday, one of my OSD was 95%. I could not write. I was advised on IRC
to change the weight of the OSD. I put it at 0.8. The data were migrated
to another OSD, but the distribution is still very heterogeneous. A few
hours later, I had the same problem with another OSD.
I tried to change the weights depending on the place occupied, but it is
not much better. For example: 16 OSD is very empty.
Do you have any idea to solve my problem ?
Regards
--
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Pierre BLONDEAU
Administrateur Systèmes & réseaux
Université de Caen
Laboratoire GREYC, Département d'informatique
tel : 02 31 56 75 42
bureau : Campus 2, Science 3, 406
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