Hello,
My question is how crush distributes chunks throughout the cluster with erasure coded pools. Currently, we have 4 OSD nodes with 36 drives(OSD daemons) per node. If we use ceph_failire_domaon=host, then we are necessarily limited to k=3,m=1, or k=2,m=2. We would like to explore k>3, m>2 modes of coding but are unsure how the crush rule set will distribute the chunks if we set the crush_failure_domain to OSD
Ideally, we would like CRUSH to distribute the chunks hierarchically so to spread them evenly across the nodes. For example, all chunks are on a single node.
Are chunks evenly spread by default? If not, how might we go about configuring them?
Cheers,
Ravi
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On Thu, 28 Feb 2019 at 14:26, Ravi Patel <ravi@xxxxxxxxxxxxxx> wrote:
Hello,My question is how crush distributes chunks throughout the cluster with erasure coded pools. Currently, we have 4 OSD nodes with 36 drives(OSD daemons) per node. If we use ceph_failire_domaon=host, then we are necessarily limited to k=3,m=1, or k=2,m=2. We would like to explore k>3, m>2 modes of coding but are unsure how the crush rule set will distribute the chunks if we set the crush_failure_domain to OSDIdeally, we would like CRUSH to distribute the chunks hierarchically so to spread them evenly across the nodes. For example, all chunks are on a single node.Are chunks evenly spread by default? If not, how might we go about configuring them?Cheers,Ravi---
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