解析bluestore onode

2021-02-22

问题

解析bluestore模式下面的Onode

方法

1. 首先通过ceph-kv-tool获取对应的元数据

1	./bin/ceph-kvstore-tool bluestore-kv dev/osd0 get O %7f%80%00%00%00%00%00%00%02%eaE%e1F%21tangmi%21%3d%ff%ff%ff%ff%ff%ff%ff%fe%ff%ff%ff%ff%ff%ff%ff%ffo out /home/krunerge/onode

2. 这个获取的数据不止包括Onode，我们可以通过写时候的osd日志可以看出

2021-02-08 14:55:21.519947 7f5b11c7d700 20 bluestore(/data/ceph/ceph-aduit-log/Ceph/build/dev/osd0)   onode #2:ea45e146:::tangmi:head# is 506 (344 bytes onode + 2 bytes spanning blobs + 160 bytes inline extents)

这个里面有344个字节是Onode结构

3. dd获取

1	dd if=/home/krunerge/onode of=/home/krunerge/onode_tmp bs=1 count=344

4. ceph-dencoder解析

./bin/ceph-dencoder type bluestore_onode_t import  /home/krunerge/onode_tmp decode dump_json
{
    "nid": 53306,
    "size": 131072,
    "attrs": {
        "attr": {
            "name": "_",
            "len": 261
        },
        "attr": {
            "name": "snapset",
            "len": 35
        }
    },
    "flags": "",
    "extent_map_shards": [],
    "expected_object_size": 0,
    "expected_write_size": 0,
    "alloc_hint_flags": 0
}

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