Ceph

h1. Add IOhint in CephFS

Summary

In Infernalis, I propose a BP: osd: rados io hints improvements. In that BP, I only added iohint in osd and librbd. But don't add iohint for cephfs. This BP will add iohint for cephfs

Owners

Jianpeng Ma<Jianpeng.ma@intel.com>

Jian Zhang<jian.zhang@intel.com>

Interested Parties

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Current Status

Please describe the current status of Ceph as it relates to this blueprint.  Is there something that this replaces?  Are there current features that are related?

Detailed Description

1:Add mount fadvise option. Because cephfs can mount subidr, so different subdir can have different usage, like some subdir don't need cache(don¡¯t use in the near future)

2:pass posix_fadvise flags from cephfs to osd. Now in kernel for posix_fadvise don't transfer fadvise flag to osd. We can try do this in order to osd know the behavior of IO to get better performance.

Work items

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Build / release tasks

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Documentation tasks

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Deprecation tasks

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