在RHEL5.x版本下面,在添加磁盤分區等操作後,一直使用partproble命令使內核重新讀取分區表信息,從而不用重新啟動。但是最近在RHEL 6(Red Hat Enterprise Linux Server release 6.6 (Santiago))下,使用partprobe出現錯誤。
[root@localhost ~]# lsof /dev/sda
[root@localhost ~]# partprobe /dev/sda
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
後面查了一下資料發現,在官方文檔How to use a new partition in RHEL6 without reboot中有如下介紹
partprobe was commonly used in RHEL 5 to inform the OS of partition table changes on the disk. In RHEL 6, it will only trigger the OS to update the partitions on a disk that none of its partitions are in use (e.g. mounted). If any partition on a disk is in use, partprobe will not trigger the OS to update partitions in the system because it is considered unsafe in some situations.
翻譯如下:
partprobe通常在RHEL 5中用來通知操作系統的磁盤上的分區表變化或更改。在RHEL 6中,只有當那些磁盤上任何分區都沒有在使用的磁盤下(例如,mounted)它才會觸發OS去更新磁盤的分區表。如果磁盤上的任何分區正在使用中,partprobe命令不會觸發操作系統去更新分區表的信息,因為在某些情況下,它被認為是不安全的。
解決方案:
1:重啟操作系統。萬能的重啟,哈哈,不過,在很多情況下是不現實的,因為重啟會中斷業務,重啟只能是下下策。
2:使用partx命令來解決這個。
[root@localhost ~]# partx -l /dev/sdb
# 1: 63-314568764 (314568702 sectors, 161059 MB)
# 2: 314568765-356514479 ( 41945715 sectors, 21476 MB)
# 3: 0- -1 ( 0 sectors, 0 MB)
# 4: 0- -1 ( 0 sectors, 0 MB)
[root@localhost ~]#
[root@localhost ~]# partx -v -a /dev/sdb
device /dev/sdb: start 0 size 356515840
gpt: 0 slices
dos: 4 slices
# 1: 63-314568764 (314568702 sectors, 161059 MB)
# 2: 314568765-356514479 ( 41945715 sectors, 21476 MB)
# 3: 0- -1 ( 0 sectors, 0 MB)
# 4: 0- -1 ( 0 sectors, 0 MB)
BLKPG: Device or resource busy
error adding partition 1
BLKPG: Device or resource busy 這個提示信息是正常,表示分區1在分區2添加前已經存在了。
Read disk and try to add all partitions to the system:
Raw
# partx -v -a /dev/sdb
device /dev/sdb: start 0 size 2097152
gpt: 0 slices
dos: 4 slices
# 1: 63- 505007 ( 504945 sectors, 258 MB)
# 2: 505008- 1010015 ( 505008 sectors, 258 MB)
# 3: 0- -1 ( 0 sectors, 0 MB)
# 4: 0- -1 ( 0 sectors, 0 MB)
BLKPG: Device or resource busy
error adding partition 1
(These last 2 lines are normal in this case because partition 1 is already added in the system before partition 2 is added)
例如在添加、讀取分區表信息後,再執行下面命令,就會發現分區2也報“BLKPG: Device or resource busy error adding partition 2”
檢查分區節點信息。
[root@localhost ~]# ls /dev/sdb*
/dev/sdb /dev/sdb1 /dev/sdb2
[root@localhost ~]#
另外,我在測試中,發現也可以使用下面方法裡解決,例如新增的分區是/dev/sdc2/ /dev/sdb2/ /dev/sda4,那麼就可以執行如下命令解決問題。
[root@localhost ~]# partx -a /dev/sdc2 /dev/sdc
[root@localhost ~]# partx -a /dev/sdb2 /dev/sdb
[root@localhost ~]# partx -a /dev/sda4 /dev/sda
參考資料:
https://access.redhat.com/node/57542
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