我有运行 RHEL6 的 XEN 来宾，并且它有一个从 Dom0 提供的 LUN。其中包含一个名为 vg_ALHINT 的 LVM 卷组（INT 表示集成，ALH 是其 Oracle 数据库名称的缩写）。数据是Oracle 11g。 VG 已导入、激活，udev 为每个逻辑卷创建了映射。
然而，设备映射器没有为其中一个逻辑卷 [LV] 创建映射，并且对于相关 LV，它创建了 /dev/dm-2，其主次编号与其余 LV 不同。
# dmsetup table
vg_ALHINT-arch: 0 4300800 linear 202:16 46139392
vg0-lv6: 0 20971520 linear 202:2 30869504
vg_ALHINT-safeset2: 0 4194304 linear 202:16 35653632
vg0-lv5: 0 2097152 linear 202:2 28772352
vg_ALHINT-safeset1: 0 4186112 linear 202:16 54528000
vg0-lv4: 0 524288 linear 202:2 28248064
vg0-lv3: 0 4194304 linear 202:2 24053760
vg_ALHINT-oradata: **
vg0-lv2: 0 4194304 linear 202:2 19859456
vg0-lv1: 0 2097152 linear 202:2 17762304
vg0-lv0: 0 17760256 linear 202:2 2048
vg_ALHINT-admin: 0 4194304 linear 202:16 41945088
** 可以看到上面的vg_ALHINT-oradata是空的。
# ls -l /dev/mapper/
total 0
[root@iui-alhdb01 ~]# ls -l /dev/mapper/
total 0
crw-rw---- 1 root root 10, 58 Apr 3 13:43 control
lrwxrwxrwx 1 root root 7 Apr 3 13:43 vg0-lv0 -> ../dm-0
lrwxrwxrwx 1 root root 7 Apr 3 13:43 vg0-lv1 -> ../dm-1
lrwxrwxrwx 1 root root 7 Apr 3 14:35 vg0-lv2 -> ../dm-2
lrwxrwxrwx 1 root root 7 Apr 3 13:43 vg0-lv3 -> ../dm-3
lrwxrwxrwx 1 root root 7 Apr 3 13:43 vg0-lv4 -> ../dm-4
lrwxrwxrwx 1 root root 7 Apr 3 13:43 vg0-lv5 -> ../dm-5
lrwxrwxrwx 1 root root 7 Apr 3 13:43 vg0-lv6 -> ../dm-6
lrwxrwxrwx 1 root root 7 Apr 3 13:59 vg_ALHINT-admin -> ../dm-8
lrwxrwxrwx 1 root root 7 Apr 3 13:59 vg_ALHINT-arch -> ../dm-9
brw-rw---- 1 root disk 253, 7 Apr 3 14:37 vg_ALHINT-oradata
lrwxrwxrwx 1 root root 8 Apr 3 13:59 vg_ALHINT-safeset1 -> ../dm-10
lrwxrwxrwx 1 root root 8 Apr 3 13:59 vg_ALHINT-safeset2 -> ../dm-11
vg_ALHINT-oradata 直到我运行时才创建dmsetup mknodes
# cat /proc/partitions
major minor #blocks name
202 0 26214400 xvda
202 1 262144 xvda1
202 2 25951232 xvda2
253 0 8880128 dm-0
253 1 1048576 dm-1
253 2 2097152 dm-2
253 3 2097152 dm-3
253 4 262144 dm-4
253 5 1048576 dm-5
253 6 10485760 dm-6
202 16 29360128 xvdb
253 8 2097152 dm-8
253 9 2150400 dm-9
253 10 2093056 dm-10
253 11 2097152 dm-11
dm-7 本来是 vg_ALHINT-oradata，但它丢失了。我运行dmsetup mknodes并被dm-7创建，但仍然失踪/proc/paritions。
# ls -l /dev/dm-7
brw-rw---- 1 root disk 253, 7 Apr 3 13:59 /dev/dm-7
它的主要和次要编号是253:7设备，并且其 VG 中的相同 LV 有 202:nn
lvs告诉我这个 LV 被暂停了：
# lvs
Logging initialised at Thu Apr 3 14:44:19 2014
Set umask from 0022 to 0077
Finding all logical volumes
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lv0 vg0 -wi-ao---- 8.47g
lv1 vg0 -wi-ao---- 1.00g
lv2 vg0 -wi-ao---- 2.00g
lv3 vg0 -wi-ao---- 2.00g
lv4 vg0 -wi-ao---- 256.00m
lv5 vg0 -wi-ao---- 1.00g
lv6 vg0 -wi-ao---- 10.00g
admin vg_ALHINT -wi-a----- 2.00g
arch vg_ALHINT -wi-a----- 2.05g
oradata vg_ALHINT -wi-s----- 39.95g
safeset1 vg_ALHINT -wi-a----- 2.00g
safeset2 vg_ALHINT -wi-a----- 2.00g
Wiping internal VG cache
该光盘是根据我们的生产数据库的快照创建的。 Oracle 已关闭且 VG 在快照之前已导出。我应该注意到，我每周通过脚本对数百个数据库执行相同的操作。因为这是一个快照，所以我从原始设备映射器中获取了表，并使用它来尝试重新创建其丢失的表：
0 35651584 linear 202:16 2048
35651584 4087808 linear 202:16 50440192
39739392 2097152 linear 202:16 39847936
41836544 41943040 linear 202:16 58714112
暂停设备后dmsetup suspend /dev/dm-7我跑了dmsetup load /dev/dm-7 $table.txt
接下来我尝试恢复该设备，
# dmsetup resume /dev/dm-7
device-mapper: resume ioctl on vg_ALHINT-oradata failed: Invalid argument
Command failed
#
任何想法，因为我真的迷路了。 （是的，我已经重新启动并重新拍摄了很多次快照，但总是遇到同样的问题。我什至重新安装了该服务器并运行yum update。）
// 编辑。
我忘记补充一点，这是我们生产环境中的原始 dmsetup 表，我尝试将 oradata 布局加载到我们的集成服务器中，就像我上面提到的那样。
# dmsetup table
vg_ALHPRD-safeset2: 0 4194304 linear 202:32 35653632
vg_ALHPRD-safeset1: 0 4186112 linear 202:32 54528000
vg_ALHPRD-oradata: 0 35651584 linear 202:32 2048
vg_ALHPRD-oradata: 35651584 4087808 linear 202:32 50440192
vg_ALHPRD-oradata: 39739392 2097152 linear 202:32 39847936
vg_ALHPRD-oradata: 41836544 41943040 linear 202:32 58714112
vg_ALHPRD-admin: 0 4194304 linear 202:32 41945088
//编辑
我运行 vgscan --mknodes 并得到：
The link /dev/vg_ALHINT/oradata should have been created by udev but it was not found. Falling back to direct link creation.
# ls -l /dev/vg_ALHINT/oradata
lrwxrwxrwx 1 root root 29 Apr 3 14:50 /dev/vg_ALHINT/oradata -> /dev/mapper/vg_ALHINT-oradata
仍然无法激活它并出现以下错误消息：
device-mapper: resume ioctl on failed: Invalid argument Unable to resume vg_ALHINT-oradata (253:7)
//编辑
我在 /var/log/messages 中看到堆栈跟踪：
Apr 3 13:58:09 iui-alhdb01 kernel: blkfront: xvdb: barriers disabled
Apr 3 13:58:09 iui-alhdb01 kernel: xvdb: unknown partition table
Apr 3 13:59:35 iui-alhdb01 kernel: device-mapper: table: 253:7: xvdb too small for target: start=58714112, len=41943040, dev_size=58720256
Apr 3 14:02:31 iui-alhdb01 ntpd[1093]: 0.0.0.0 c612 02 freq_set kernel 5.242 PPM
Apr 3 14:02:31 iui-alhdb01 ntpd[1093]: 0.0.0.0 c615 05 clock_sync
Apr 3 14:30:13 iui-alhdb01 kernel: device-mapper: table: 253:2: xvdb too small for target: start=58714112, len=41943040, dev_size=58720256
Apr 3 14:33:34 iui-alhdb01 kernel: INFO: task vi:1394 blocked for more than 120 seconds.
Apr 3 14:33:34 iui-alhdb01 kernel: Not tainted 2.6.32-431.11.2.el6.x86_64 #1
Apr 3 14:33:34 iui-alhdb01 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr 3 14:33:34 iui-alhdb01 kernel: vi D 0000000000000000 0 1394 1271 0x00000084
Apr 3 14:33:34 iui-alhdb01 kernel: ffff88007aef19b8 0000000000000082 ffff88007aef1978 ffffffffa000443c
Apr 3 14:33:34 iui-alhdb01 kernel: ffff88007d208d80 ffff880037cabc08 ffff880037cda0c8 ffff8800022168a8
Apr 3 14:33:34 iui-alhdb01 kernel: ffff880037da45f8 ffff88007aef1fd8 000000000000fbc8 ffff880037da45f8
Apr 3 14:33:34 iui-alhdb01 kernel: Call Trace:
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffffa000443c>] ? dm_table_unplug_all+0x5c/0x100 [dm_mod]
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff810a7091>] ? ktime_get_ts+0xb1/0xf0
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff811bf1f0>] ? sync_buffer+0x0/0x50
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff815286c3>] io_schedule+0x73/0xc0
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff811bf230>] sync_buffer+0x40/0x50
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8152918f>] __wait_on_bit+0x5f/0x90
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff811bf1f0>] ? sync_buffer+0x0/0x50
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff81529238>] out_of_line_wait_on_bit+0x78/0x90
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8109b310>] ? wake_bit_function+0x0/0x50
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff811bf1e6>] __wait_on_buffer+0x26/0x30
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffffa0085875>] __ext4_get_inode_loc+0x1e5/0x3b0 [ext4]
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffffa0088006>] ext4_iget+0x86/0x7d0 [ext4]
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffffa008ec35>] ext4_lookup+0xa5/0x140 [ext4]
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff81198b05>] do_lookup+0x1a5/0x230
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff81198e90>] __link_path_walk+0x200/0xff0
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8114a667>] ? handle_pte_fault+0xf7/0xb00
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff811a3c6a>] ? dput+0x9a/0x150
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff81199f3a>] path_walk+0x6a/0xe0
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8119a14b>] filename_lookup+0x6b/0xc0
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8119b277>] user_path_at+0x57/0xa0
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8104a98c>] ? __do_page_fault+0x1ec/0x480
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8119707b>] ? putname+0x2b/0x40
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8118eac0>] vfs_fstatat+0x50/0xa0
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff811c4645>] ? nr_blockdev_pages+0x15/0x70
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8115c4ad>] ? si_swapinfo+0x1d/0x90
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8118ec3b>] vfs_stat+0x1b/0x20
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8118ec64>] sys_newstat+0x24/0x50
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff810e2057>] ? audit_syscall_entry+0x1d7/0x200
Apr 3 14:33:34 iui-alhdb01 kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Apr 3 14:35:34 iui-alhdb01 kernel: INFO: task vi:1394 blocked for more than 120 seconds.
Apr 3 14:35:34 iui-alhdb01 kernel: Not tainted 2.6.32-431.11.2.el6.x86_64 #1
Apr 3 14:35:34 iui-alhdb01 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr 3 14:35:34 iui-alhdb01 kernel: vi D 0000000000000000 0 1394 1271 0x00000084
Apr 3 14:35:34 iui-alhdb01 kernel: ffff88007aef19b8 0000000000000082 ffff88007aef1978 ffffffffa000443c
Apr 3 14:35:34 iui-alhdb01 kernel: ffff88007d208d80 ffff880037cabc08 ffff880037cda0c8 ffff8800022168a8
Apr 3 14:35:34 iui-alhdb01 kernel: ffff880037da45f8 ffff88007aef1fd8 000000000000fbc8 ffff880037da45f8
Apr 3 14:35:34 iui-alhdb01 kernel: Call Trace:
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffffa000443c>] ? dm_table_unplug_all+0x5c/0x100 [dm_mod]
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff810a7091>] ? ktime_get_ts+0xb1/0xf0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811bf1f0>] ? sync_buffer+0x0/0x50
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff815286c3>] io_schedule+0x73/0xc0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811bf230>] sync_buffer+0x40/0x50
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8152918f>] __wait_on_bit+0x5f/0x90
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811bf1f0>] ? sync_buffer+0x0/0x50
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff81529238>] out_of_line_wait_on_bit+0x78/0x90
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8109b310>] ? wake_bit_function+0x0/0x50
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811bf1e6>] __wait_on_buffer+0x26/0x30
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffffa0085875>] __ext4_get_inode_loc+0x1e5/0x3b0 [ext4]
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffffa0088006>] ext4_iget+0x86/0x7d0 [ext4]
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffffa008ec35>] ext4_lookup+0xa5/0x140 [ext4]
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff81198b05>] do_lookup+0x1a5/0x230
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff81198e90>] __link_path_walk+0x200/0xff0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8114a667>] ? handle_pte_fault+0xf7/0xb00
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811a3c6a>] ? dput+0x9a/0x150
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff81199f3a>] path_walk+0x6a/0xe0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8119a14b>] filename_lookup+0x6b/0xc0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8119b277>] user_path_at+0x57/0xa0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8104a98c>] ? __do_page_fault+0x1ec/0x480
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8119707b>] ? putname+0x2b/0x40
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8118eac0>] vfs_fstatat+0x50/0xa0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c4645>] ? nr_blockdev_pages+0x15/0x70
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8115c4ad>] ? si_swapinfo+0x1d/0x90
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8118ec3b>] vfs_stat+0x1b/0x20
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8118ec64>] sys_newstat+0x24/0x50
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff810e2057>] ? audit_syscall_entry+0x1d7/0x200
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Apr 3 14:35:34 iui-alhdb01 kernel: INFO: task vgdisplay:1437 blocked for more than 120 seconds.
Apr 3 14:35:34 iui-alhdb01 kernel: Not tainted 2.6.32-431.11.2.el6.x86_64 #1
Apr 3 14:35:34 iui-alhdb01 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Apr 3 14:35:34 iui-alhdb01 kernel: vgdisplay D 0000000000000000 0 1437 1423 0x00000080
Apr 3 14:35:34 iui-alhdb01 kernel: ffff88007da35a18 0000000000000086 ffff88007da359d8 ffffffffa000443c
Apr 3 14:35:34 iui-alhdb01 kernel: 000000000007fff0 0000000000010000 ffff88007da359d8 ffff88007d24d380
Apr 3 14:35:34 iui-alhdb01 kernel: ffff880037c8c5f8 ffff88007da35fd8 000000000000fbc8 ffff880037c8c5f8
Apr 3 14:35:34 iui-alhdb01 kernel: Call Trace:
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffffa000443c>] ? dm_table_unplug_all+0x5c/0x100 [dm_mod]
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff810a7091>] ? ktime_get_ts+0xb1/0xf0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff815286c3>] io_schedule+0x73/0xc0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c8a9d>] __blockdev_direct_IO_newtrunc+0xb7d/0x1270
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c4400>] ? blkdev_get_block+0x0/0x20
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c9207>] __blockdev_direct_IO+0x77/0xe0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c4400>] ? blkdev_get_block+0x0/0x20
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c5487>] blkdev_direct_IO+0x57/0x60
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c4400>] ? blkdev_get_block+0x0/0x20
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811217bb>] generic_file_aio_read+0x6bb/0x700
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c5fd0>] ? blkdev_get+0x10/0x20
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c5fe0>] ? blkdev_open+0x0/0xc0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8118617f>] ? __dentry_open+0x23f/0x360
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c4841>] blkdev_aio_read+0x51/0x80
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff81188e8a>] do_sync_read+0xfa/0x140
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff810ec3f6>] ? rcu_process_dyntick+0xd6/0x120
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8109b290>] ? autoremove_wake_function+0x0/0x40
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811c479c>] ? block_ioctl+0x3c/0x40
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8119dc12>] ? vfs_ioctl+0x22/0xa0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8119ddb4>] ? do_vfs_ioctl+0x84/0x580
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff81226496>] ? security_file_permission+0x16/0x20
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff81189775>] vfs_read+0xb5/0x1a0
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff811898b1>] sys_read+0x51/0x90
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff810e1e4e>] ? __audit_syscall_exit+0x25e/0x290
Apr 3 14:35:34 iui-alhdb01 kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Apr 3 14:39:19 iui-alhdb01 kernel: device-mapper: table: 253:7: xvdb too small for target: start=58714112, len=41943040, dev_size=58720256
Apr 3 14:53:57 iui-alhdb01 kernel: device-mapper: table: 253:7: xvdb too small for target: start=58714112, len=41943040, dev_size=58720256
Apr 3 15:02:42 iui-alhdb01 yum[1544]: Installed: sos-2.2-47.el6.noarch
Apr 3 15:52:29 iui-alhdb01 kernel: device-mapper: table: 253:7: xvdb too small for target: start=58714112, len=41943040, dev_size=58720256
Apr 3 15:59:08 iui-alhdb01 kernel: device-mapper: table: 253:7: xvdb too small for target: start=58714112, len=41943040, dev_size=58720256
答案1
devices.txt在内核文档中看到：Major 202是“Xen虚拟块设备”，Major 253是LVM/设备映射器。
您的所有dm-x设备都是253:n；他们只是观点到202:n。
错误信息很明确：
device-mapper: table: 253:7: xvdb too small for target: start=58714112, len=41943040, dev_size=58720256
XEN 设备似乎发生了变化。无法加载您的vg_ALHPRD-oradata文件，因为它尝试访问202:16根本不存在的存储空间。
答案2
看起来虚拟机管理程序上的多路径拒绝更新其 LUN 大小的映射。
该LUN最初为28Gb，后来在存储阵列上增长到48Gb。
VG信息认为是48G，确实这张盘是48G，但是多路径不会更新，认为仍然是28G。
坚持 28G 的多路径：
# multipath -l 350002acf962421ba
350002acf962421ba dm-17 3PARdata,VV
size=28G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
|- 8:0:0:22 sdt 65:48 active undef running
|- 10:0:0:22 sdbh 67:176 active undef running
|- 7:0:0:22 sddq 71:128 active undef running
|- 9:0:0:22 sdfb 129:208 active undef running
|- 8:0:1:22 sdmz 70:432 active undef running
|- 7:0:1:22 sdoj 128:496 active undef running
|- 10:0:1:22 sdop 129:336 active undef running
|- 9:0:1:22 sdqm 132:352 active undef running
|- 7:0:2:22 sdxh 71:624 active undef running
|- 8:0:2:22 sdzy 131:704 active undef running
|- 10:0:2:22 sdaab 131:752 active undef running
|- 9:0:2:22 sdaed 66:912 active undef running
|- 7:0:3:22 sdakm 132:992 active undef running
|- 10:0:3:22 sdall 134:880 active undef running
|- 8:0:3:22 sdamx 8:1232 active undef running
`- 9:0:3:22 sdaqa 69:1248 active undef running
实际存储的光盘大小：
# showvv ALHIDB_SNP_001
-Rsvd(MB)-- -(MB)-
Id Name Prov Type CopyOf BsId Rd -Detailed_State- Adm Snp Usr VSize
4098 ALHIDB_SNP_001 snp vcopy ALHIDB_SNP_001.ro 5650 RW normal -- -- -- 49152
只是为了确保我有正确的光盘：
# showvlun -showcols VVName,VV_WWN| grep -i 0002acf962421ba
ALHIDB_SNP_001 50002ACF962421BA
VG认为它是48G
--- Volume group ---
VG Name vg_ALHINT
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 30
VG Access read/write
VG Status exported/resizable
MAX LV 0
Cur LV 5
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 48.00 GiB
PE Size 4.00 MiB
Total PE 12287
Alloc PE / Size 12287 / 48.00 GiB
Free PE / Size 0 / 0
VG UUID qqZ9Vi-5Ob1-R6zb-YeWa-jDfg-9wc7-E2wsem
当我重新扫描 HBA 中的新光盘并重新配置 multipthing 时，光盘仍然显示 28G，因此我尝试了此操作，但没有任何变化：
# multipathd -k'resize map 350002acf962421ba'
版本：
lvm2-2.02.56-8.100.3.el5
device-mapper-multipath-libs-0.4.9-46.100.5.el5
解决方法 因为我想不出解决方案，所以我这样做了：我之前没有写过我在其上运行 OVM 3.2，所以我的解决方案的一部分将包括 OVM。 i) 通过 OVM 关闭 Xen 上的 guest 虚拟机。 ii) 删除光盘 iii) 从 OVM 中删除 LUN iv) 从虚拟机管理程序中删除不存在的 LUN。 v) OVM 重新扫描存储。 vi) 等待 30 分钟；) vii) 将我的光盘提供给具有不同 LUN ID 的虚拟机管理程序。 viii) OVM 重新扫描存储
现在我神奇地看到了 48G 光盘。
# multipath -l 350002acf962421ba
350002acf962421ba dm-18 3PARdata,VV
size=48G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
|- 9:0:0:127 sdt 65:48 active undef running
|- 9:0:1:127 sdbh 67:176 active undef running
|- 9:0:2:127 sddo 71:96 active undef running
|- 9:0:3:127 sdfb 129:208 active undef running
|- 10:0:3:127 sdmz 70:432 active undef running
|- 10:0:0:127 sdoh 128:464 active undef running
|- 10:0:1:127 sdop 129:336 active undef running
|- 10:0:2:127 sdqm 132:352 active undef running
|- 7:0:1:127 sdzu 131:640 active undef running
|- 7:0:0:127 sdxh 71:624 active undef running
|- 7:0:3:127 sdaed 66:912 active undef running
|- 7:0:2:127 sdaab 131:752 active undef running
|- 8:0:0:127 sdakm 132:992 active undef running
|- 8:0:1:127 sdall 134:880 active undef running
|- 8:0:2:127 sdamx 8:1232 active undef running
`- 8:0:3:127 sdaqa 69:1248 active undef running