[20180806]tune2fs调整保留块百分比.txt

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    [20180806]tune2fs调整保留块百分比.txt

    –//生产系统一台dg磁盘空间满了.我前一阵子已经将*convert参数修改,增加磁盘,但是这个分区里面的数据文件还可以增长,这样依旧存
    –//在磁盘空间不足的情况,正常应该移动数据文件到别的分区,然后rename.突然想起建立分区时有一定的保留区给root用户,我们这个分
    –//区磁盘很大接近2T,这样按照5%的比例计算,有将近100G的空间可能浪费了.

    –//参考以前测试的链接:http://blog.itpub.net/267265/viewspace-2145428/=>[20170926]tune2fs调整保留块百分比.txt
    –//注意如果在mount状态下修改无效!!

    1.环境:
    # cat /proc/version
    Linux version 2.6.39-300.26.1.el5uek ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-52)) #1 SMP Thu Jan 3 18:31:38 PST 2013

    # df -h /u02
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/cciss/c0d1p1     1.7T  1.6T   20G  99% /u02
    –//剩余20G.

    # tune2fs -l /dev/cciss/c0d1p1
    tune2fs 1.39 (29-May-2006)
    Filesystem volume name:   /u02
    Last mounted on:          <not available>
    Filesystem UUID:          d9c0c411-25ea-4e21-b383-3ef446d2c064
    Filesystem magic number:  0xEF53
    Filesystem revision #:    1 (dynamic)
    Filesystem features:      has_journal resize_inode dir_index filetype needs_recovery sparse_super large_file
    Default mount options:    (none)
    Filesystem state:         clean
    Errors behavior:          Continue
    Filesystem OS type:       Linux
    Inode count:              219774976
    Block count:              439520246
    Reserved block count:     21976012
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Free blocks:              432573167
    Free inodes:              219774965
    First block:              0
    Block size:               4096
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Fragment size:            4096
    Reserved GDT blocks:      919
    Blocks per group:         32768
    Fragments per group:      32768
    Inodes per group:         16384
    Inode blocks per group:   512
    Filesystem created:       Thu Feb 23 09:42:17 2017
    Last mount time:          Thu Feb 23 09:55:13 2017
    Last write time:          Thu Feb 23 09:55:13 2017
    Mount count:              3
    Maximum mount count:      -1
    Last checked:             Thu Feb 23 09:42:17 2017
    Check interval:           0 (<none>)
    Reserved blocks uid:      0 (user root)
    Reserved blocks gid:      0 (group root)
    First inode:              11
    Inode size:               128
    Journal inode:            8
    Default directory hash:   tea
    Directory Hash Seed:      6e38ec2b-9916-496f-a143-b9b22a7e1f09
    Journal backup:           inode blocks

    –//21976012*4096/1024/1024/1024 = 83.83183288574218750000,保留84G.
    –//实际上-m 1也是浪费,我采用-r参数保留一定数量的块.
    –//保留1G ,1024*1024*1024/4096 = 262144

    2.调整保留块百分比:
    –//关闭数据库.
    [email protected]> shutdown immediate ;
    Database closed.
    Database dismounted.
    ORACLE instance shut down.

    # umount /dev/cciss/c0d1p1
    umount: /u02: device is busy
    umount: /u02: device is busy

    # lsof /u02
    COMMAND  PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    tnslsnr 9361 oracle  cwd    DIR 104,17     4096    2 /u02
    –//奇怪.监听进程怎么会关联到/u02

    # cat /proc/9361/environ  | tr ” ‘n’| grep u02
    PWD=/u02

    –//原来当时监听启动时的目录是/u02,停止监听进程.
    $ lsnrctl stop
    LSNRCTL for Linux: Version 11.2.0.4.0 – Production on 06-AUG-2018 08:29:12
    Copyright (c) 1991, 2013, Oracle.  All rights reserved.
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.100.76)(PORT=1521)))
    The command completed successfully

    # sync;sync
    # umount /dev/cciss/c0d1p1
    # tune2fs -r 262144 /dev/cciss/c0d1p1
    tune2fs 1.39 (29-May-2006)
    Setting reserved blocks count to 262144

    # tune2fs -l /dev/cciss/c0d1p1 | egrep “Reserved block count”
    Reserved block count:     262144

    # mount /u02
    # df -h /u02
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/cciss/c0d1p1     1.7T  1.6T  103G  94% /u02

    –//现在多了83G,应该不会再遇到磁盘空间不足的问题在/u02分区.

    3.启动数据库.略.
    $ lsnrctl start

    [email protected]> startup open read only;
    ORACLE instance started.

    Total System Global Area 8.0973E+10 bytes
    Fixed Size                  2261968 bytes
    Variable Size            9663679536 bytes
    Database Buffers         7.1135E+10 bytes
    Redo Buffers              171487232 bytes
    Database mounted.
    Database opened.

    DGMGRL> show database xxxxdg
    Database – xxxxdg
      Enterprise Manager Name: xxxx_dg
      Role:                    PHYSICAL STANDBY
      Intended State:          APPLY-ON
      Transport Lag:           0 seconds (computed 0 seconds ago)
      Apply Lag:               0 seconds (computed 0 seconds ago)
      Apply Rate:              34.40 MByte/s
      Real Time Query:         ON
      Instance(s):
        xxxxdg
    Database Status:
    SUCCESS

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