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7.10. 扩展 BlueFS DB 设备

您可以扩展 BlueStore 文件系统(BlueFS)数据的存储，这是 ceph-volume 创建的 OSD 的 RocksDB 数据。

先决条件

  • 一个正在运行的 Red Hat Ceph Storage 集群。
  • Ceph OSD 由 ceph-volume 实用程序准备。
  • 创建卷组和逻辑卷。
注意

在部署 OSD 的主机上运行这些步骤。

流程

  1. 可选：在 cephadm shell 中，列出 Red Hat Ceph Storage 集群中的设备。

    示例

    [ceph: root@host01 /]# ceph-volume lvm list

====== osd.3 =======

  [db]          /dev/db-test/db1

      block device              /dev/test/lv1
      block uuid                N5zoix-FePe-uExe-UngY-D9YG-BMs0-1tTDyB
      cephx lockbox secret
      cluster fsid              1a6112da-ed05-11ee-bacd-525400565cda
      cluster name              ceph
      crush device class
      db device                 /dev/db-test/db1
      db uuid                   1TUaDY-3mEt-fReP-cyB2-JyZ1-oUPa-hKPfo6
      encrypted                 0
      osd fsid                  94ff742c-7bfd-4fb5-8dc4-843d10ac6731
      osd id                    3
      osdspec affinity          None
      type                      db
      vdo                       0
      devices                   /dev/vdh

  [block]       /dev/test/lv1

      block device              /dev/test/lv1
      block uuid                N5zoix-FePe-uExe-UngY-D9YG-BMs0-1tTDyB
      cephx lockbox secret
      cluster fsid              1a6112da-ed05-11ee-bacd-525400565cda
      cluster name              ceph
      crush device class
      db device                 /dev/db-test/db1
      db uuid                   1TUaDY-3mEt-fReP-cyB2-JyZ1-oUPa-hKPfo6
      encrypted                 0
      osd fsid                  94ff742c-7bfd-4fb5-8dc4-843d10ac6731
      osd id                    3
      osdspec affinity          None
      type                      block
      vdo                       0
      devices                   /dev/vdg
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  2. 获取卷组信息：

    示例

    [root@host01 ~]# vgs

VG                                        #PV #LV #SN Attr   VSize    VFree
db-test                                     1   1   0 wz--n- <200.00g <160.00g
test                                        1   1   0 wz--n- <200.00g <170.00g
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  3. 停止 Ceph OSD 服务：

    示例

    [root@host01 ~]# systemctl stop host01a6112da-ed05-11ee-bacd-525400565cda@osd.3.service
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  4. 重新定义、缩小并扩展逻辑卷：

    示例

    [root@host01 ~]# lvresize -l 100%FREE /dev/db-test/db1
Size of logical volume db-test/db1 changed from 40.00 GiB (10240 extents) to <160.00 GiB (40959 extents).
Logical volume db-test/db1 successfully resized.
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  5. 启动 cephadm shell：

    语法

    cephadm shell -m /var/lib/ceph/CLUSTER_FSID/osd.OSD_ID:/var/lib/ceph/osd/ceph-OSD_ID:z
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    示例

    [root@host01 ~]# cephadm shell -m /var/lib/ceph/1a6112da-ed05-11ee-bacd-525400565cda/osd.3:/var/lib/ceph/osd/ceph-3:z
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    ceph-bluestore-tool 需要从 cephadm shell 容器中访问 BlueStore 数据，因此必须绑定挂载。使用 -m 选项使 BlueStore 数据可用。

  6. 在扩展前检查 Rocks DB 的大小：

    语法

    ceph-bluestore-tool show-label --path OSD_DIRECTORY_PATH
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    示例

    [ceph: root@host01 /]# ceph-bluestore-tool show-label --path /var/lib/ceph/osd/ceph-3/
inferring bluefs devices from bluestore path
{
    "/var/lib/ceph/osd/ceph-3/block": {
        "osd_uuid": "94ff742c-7bfd-4fb5-8dc4-843d10ac6731",
        "size": 32212254720,
        "btime": "2024-04-03T08:34:12.742848+0000",
        "description": "main",
        "bfm_blocks": "7864320",
        "bfm_blocks_per_key": "128",
        "bfm_bytes_per_block": "4096",
        "bfm_size": "32212254720",
        "bluefs": "1",
        "ceph_fsid": "1a6112da-ed05-11ee-bacd-525400565cda",
        "ceph_version_when_created": "ceph version 19.0.0-2493-gd82c9aa1 (d82c9aa17f09785fe698d262f9601d87bb79f962) squid (dev)",
        "created_at": "2024-04-03T08:34:15.637253Z",
        "elastic_shared_blobs": "1",
        "kv_backend": "rocksdb",
        "magic": "ceph osd volume v026",
        "mkfs_done": "yes",
        "osd_key": "AQCEFA1m9xuwABAAwKEHkASVbgB1GVt5jYC2Sg==",
        "osdspec_affinity": "None",
        "ready": "ready",
        "require_osd_release": "19",
        "whoami": "3"
    },
    "/var/lib/ceph/osd/ceph-3/block.db": {
        "osd_uuid": "94ff742c-7bfd-4fb5-8dc4-843d10ac6731",
        "size": 40794497536,
        "btime": "2024-04-03T08:34:12.748816+0000",
        "description": "bluefs db"
    }
}
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  7. 扩展 BlueStore 设备：

    语法

    ceph-bluestore-tool bluefs-bdev-expand --path OSD_DIRECTORY_PATH
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    示例

    [ceph: root@host01 /]# ceph-bluestore-tool bluefs-bdev-expand --path /var/lib/ceph/osd/ceph-3/
inferring bluefs devices from bluestore path
1 : device size 0x27ffbfe000 : using 0x2300000(35 MiB)
2 : device size 0x780000000 : using 0x52000(328 KiB)
Expanding DB/WAL...
1 : expanding  to 0x171794497536
1 : size label updated to 171794497536
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  8. 验证 block.db 是否已扩展：

    语法

    ceph-bluestore-tool show-label --path OSD_DIRECTORY_PATH
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    示例

    [ceph: root@host01 /]# ceph-bluestore-tool show-label --path /var/lib/ceph/osd/ceph-3/
inferring bluefs devices from bluestore path
{
    "/var/lib/ceph/osd/ceph-3/block": {
        "osd_uuid": "94ff742c-7bfd-4fb5-8dc4-843d10ac6731",
        "size": 32212254720,
        "btime": "2024-04-03T08:34:12.742848+0000",
        "description": "main",
        "bfm_blocks": "7864320",
        "bfm_blocks_per_key": "128",
        "bfm_bytes_per_block": "4096",
        "bfm_size": "32212254720",
        "bluefs": "1",
        "ceph_fsid": "1a6112da-ed05-11ee-bacd-525400565cda",
        "ceph_version_when_created": "ceph version 19.0.0-2493-gd82c9aa1 (d82c9aa17f09785fe698d262f9601d87bb79f962) squid (dev)",
        "created_at": "2024-04-03T08:34:15.637253Z",
        "elastic_shared_blobs": "1",
        "kv_backend": "rocksdb",
        "magic": "ceph osd volume v026",
        "mkfs_done": "yes",
        "osd_key": "AQCEFA1m9xuwABAAwKEHkASVbgB1GVt5jYC2Sg==",
        "osdspec_affinity": "None",
        "ready": "ready",
        "require_osd_release": "19",
        "whoami": "3"
    },
    "/var/lib/ceph/osd/ceph-3/block.db": {
        "osd_uuid": "94ff742c-7bfd-4fb5-8dc4-843d10ac6731",
        "size": 171794497536,
        "btime": "2024-04-03T08:34:12.748816+0000",
        "description": "bluefs db"
    }
}
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  9. 退出 shell 并重启 OSD：

    示例

    [root@host01 ~]# systemctl start host01a6112da-ed05-11ee-bacd-525400565cda@osd.3.service
osd.3              host01               running (15s)     0s ago  13m    46.9M    4096M  19.0.0-2493-gd82c9aa1  3714003597ec  02150b3b6877
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