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映射块设备提示rbd: sysfs write failed的解决方法

标签(空格分隔): ceph ceph运维 rbd


问题描述:

创建完镜像foo后,映射镜像时提示下面的错误:

[root@node3 ~]# rbd map testpool/foo
rbd: sysfs write failed
RBD image feature set mismatch. Try disabling features unsupported by the kernel with "rbd feature disable".
In some cases useful info is found in syslog - try "dmesg | tail".
rbd: map failed: (6) No such device or address

解决办法:

出现这种错误的原因是OS kernel不支持块设备镜像的一些特性,所以映射失败。查看该镜像支持了哪些特性:

[root@node3 ~]# rbd info testpool/foo
rbd image 'foo':
        size 1024 MB in 256 objects
        order 22 (4096 kB objects)
        block_name_prefix: rbd_data.3723643c9869
        format: 2
        features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
        flags: 
        create_timestamp: Sat Oct 21 14:38:04 2017

可以看到特性feature一栏,由于我OS的kernel只支持layering,其他都不支持,所以需要把部分不支持的特性disable掉。

方法一:

直接diable这个rbd镜像的不支持的特性:

[root@node3 ~]#  rbd  feature disable testpool/foo  exclusive-lock object-map fast-diff deep-flatten
[root@node3 ~]# rbd info testpool/foo
rbd image 'foo':
        size 1024 MB in 256 objects
        order 22 (4096 kB objects)
        block_name_prefix: rbd_data.3723643c9869
        format: 2
        features: layering
        flags: 
        create_timestamp: Sat Oct 21 14:38:04 2017

方法二:

创建rbd镜像时就指明需要的特性,如:

[root@node3 ~]# rbd create testpool/foo1 --size 1024 --image-feature layering
[root@node3 ~]# rbd info testpool/foo1
rbd image 'foo1':
        size 1024 MB in 256 objects
        order 22 (4096 kB objects)
        block_name_prefix: rbd_data.3752643c9869
        format: 2
        features: layering
        flags: 
        create_timestamp: Sat Oct 21 14:06:47 2017

方法三:

如果还想一劳永逸,那么就在执行创建rbd镜像命令的主机中,修改Ceph配置文件/etc/ceph/ceph.conf,在global section下,增加:

rbd_default_features = 1

注意:该方法需要先删除之前创建过的镜像,再创建该镜像

通过上面三个方法的任意一种之后,再次尝试映射rdb镜像到本地块设备,成功!

[root@node3 ~]# rbd map testpool/foo 
/dev/rbd0

参考文献:

RDB MAP出错RBD SYSFS WRITE FAILED

posted on 2017-10-31 14:02  sisimi_2017  阅读(...)  评论(...编辑  收藏