reef: crimson/os/seastore: enable SMR HDD #53935
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We can essentially support SMR devices(HDD) and ZNS device(SSDs) which are both subsets of Zoned Block Devices under the same interface ZNSSegmentManager with small changes in design. Hence changing the interface name to a more contextual name ZBDSegmentManager. This also helps to add SMR device support for crimson. Signed-off-by: Aravind Ramesh <aravind.ramesh@wdc.com> (cherry picked from commit 7fbdeab)
SMR HDDs are also zoned block devices similar to ZNS SSDs. SMR devices have 2 types of zones named as conventional zones which are random writeable and sequentially-write-required zones, which are sequentially writable and lend themselves to zone operations like ZNS SSD zones. Conventional zones do not respond to zone operations, so to enable crimson-osd to use SMR HDDs, for now, we don't consider the conventional zones which generally make up a very small percentage of the drive capacity. Signed-off-by: Aravind Ramesh <aravind.ramesh@wdc.com> (cherry picked from commit 355ffa4)
athanatos
approved these changes
Oct 11, 2023
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backport of: #51355
See: https://gist.github.com/Matan-B/3366024c130634942d0b1227112663e1
this backport was staged using crimson-backport.sh which is based on ceph-backport.sh version 16.0.0.6848
find the latest version at https://github.com/ceph/ceph/blob/main/src/script/ceph-backport.sh