mirror of
https://github.com/ceph/ceph
synced 2024-12-19 18:02:46 +00:00
86 lines
2.5 KiB
Perl
86 lines
2.5 KiB
Perl
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$ get_block_name_prefix() {
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> rbd info --format=json $1 | python -c "import sys, json; print json.load(sys.stdin)['block_name_prefix']"
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> }
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Short segments:
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$ rbd create --size 12M img
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$ DEV=$(sudo rbd map img)
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$ xfs_io -d -c 'pwrite 5120 512' $DEV >/dev/null
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$ xfs_io -d -c 'pwrite 12577280 512' $DEV >/dev/null
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$ hexdump $DEV
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0000000 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0001400 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0001600 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0bfea00 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0bfec00 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0c00000
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$ sudo rbd unmap $DEV
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$ rbd rm --no-progress img
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Short segment, ceph_msg_data_bio_cursor_init():
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$ rbd create --size 12M img
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$ DEV=$(sudo rbd map img)
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$ xfs_io -d -c 'pwrite 0 512' $DEV >/dev/null
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$ rados -p rbd stat $(get_block_name_prefix img).0000000000000000
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.* size 512 (re)
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$ xfs_io -d -c 'pread -b 2M 0 2M' $DEV >/dev/null
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0000200 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0c00000
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$ sudo rbd unmap $DEV
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$ rbd rm --no-progress img
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Short segment, ceph_msg_data_bio_advance():
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$ rbd create --size 12M img
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$ DEV=$(sudo rbd map img)
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$ xfs_io -d -c 'pwrite 0 1049088' $DEV >/dev/null
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$ rados -p rbd stat $(get_block_name_prefix img).0000000000000000
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.* size 1049088 (re)
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$ xfs_io -d -c 'pread -b 2M 0 2M' $DEV >/dev/null
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$ hexdump $DEV
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0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
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*
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0100200 0000 0000 0000 0000 0000 0000 0000 0000
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*
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0c00000
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$ sudo rbd unmap $DEV
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$ rbd rm --no-progress img
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Cloned bios (dm-snapshot.ko, based on generic/081):
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$ rbd create --size 300M img
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$ DEV=$(sudo rbd map img)
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$ sudo vgcreate vg_img $DEV
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Physical volume "/dev/rbd?" successfully created (glob)
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Volume group "vg_img" successfully created
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$ sudo lvcreate -L 256M -n lv_img vg_img
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Logical volume "lv_img" created.
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$ udevadm settle
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$ sudo mkfs.ext4 -q /dev/mapper/vg_img-lv_img
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$ sudo lvcreate -L 4M --snapshot -n lv_snap vg_img/lv_img
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Logical volume "lv_snap" created.
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$ udevadm settle
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$ sudo mount /dev/mapper/vg_img-lv_snap /mnt
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$ sudo xfs_io -f -c 'pwrite 0 5M' /mnt/file1 >/dev/null
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$ sudo umount /mnt
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$ sudo vgremove -f vg_img
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Logical volume "lv_snap" successfully removed
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Logical volume "lv_img" successfully removed
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Volume group "vg_img" successfully removed
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$ sudo pvremove $DEV
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Labels on physical volume "/dev/rbd?" successfully wiped (glob)
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$ sudo rbd unmap $DEV
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$ rbd rm --no-progress img
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