Kürşad Dara » 2012

LVM disk resize işlemi

Vmware üstünde çalışan bir linux makinenin diskini artırdım. LVM üstündende bunu yapmak gerekiyor tabi ki.

[root@localhost ~]# fdisk -l

Disk /dev/sda: 85.9 GB, 85899345920 bytes
255 heads, 63 sectors/track, 10443 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0008a7d6

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        1306     9972736   8e  Linux LVM

Disk /dev/mapper/VolGroup-lv_root: 5981 MB, 5981077504 bytes
255 heads, 63 sectors/track, 727 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_root doesn`t contain a valid partition table

Disk /dev/mapper/VolGroup-lv_swap: 4227 MB, 4227858432 bytes
255 heads, 63 sectors/track, 514 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_swap doesn`t contain a valid partition table

Öncelikle yeni bir partition oluşturuyoruz.

[root@localhost ~]# fdisk  /dev/sda

WARNING: DOS-compatible mode is deprecated. It`s strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (1306-10443, default 1306): 
Using default value 1306
Last cylinder, +cylinders or +size{K,M,G} (1306-10443, default 10443): 
Using default value 10443

Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

Reboot işleminden sonra, pvcreate komutu ile oluşturduğumuz diski LVM görecek şekilde oluşturuyoruz.

[root@localhost ~]# pvcreate /dev/sda3
  Writing physical volume data to disk "/dev/sda3"
  Physical volume "/dev/sda3" successfully created

lvdisplay ile var olan konfigürasyona bakıyoruz.

[root@localhost ~]# lvdisplay 
  --- Logical volume ---
  LV Name                /dev/VolGroup/lv_root
  VG Name                VolGroup
  LV UUID                IqdsSn-2dBV-QDhf-Ym13-c7vy-v79b-EQv6UK
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                5.57 GiB
  Current LE             1426
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Name                /dev/VolGroup/lv_swap
  VG Name                VolGroup
  LV UUID                Bvh8l4-DNXF-WmXy-z7Hi-7oVi-VJhb-4Fl7wC
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                3.94 GiB
  Current LE             1008
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

Sıra geldi Volume Group’u vgextend ile büyütmeye.

[root@localhost ~]# vgextend VolGroup /dev/sda3
  Volume group "VolGroup" successfully extended

Baktığımızda;

[root@localhost ~]# vgdisplay 
  --- Volume group ---
  VG Name               VolGroup
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               79.50 GiB
  PE Size               4.00 MiB
  Total PE              20353
  Alloc PE / Size       2434 / 9.51 GiB
  Free  PE / Size       17919 / 70.00 GiB
  VG UUID               QxKsuL-3ke0-sZHW-e4cA-Rqyq-6vRg-zjCc2m

LVM’de total size istediğimiz gibi oldu. Şimdi diskimizi büyütelim artık.

[root@localhost ~]# lvextend -L +70GB /dev/mapper/VolGroup-lv_root 
  Extending logical volume lv_root to 75.57 GiB
  Insufficient free space: 17920 extents needed, but only 17919 available

Bu hatanın sebebi şu eklediğimiz boş alan tam olarak 70GB değil ( 69 küsür GB ) o yüzden 69GB olarak veriyoruz.

lvextend komutu ile de “Free PE / Size” alanında belirtilen kadar boş alanı kullanıp diski extend ediyoruz.
df ile baktığımızda göründüğü gibi disk alanını hala eskisi gibi.

[root@localhost ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       5749032   1584584   3872404  30% /
tmpfs                  1960684         0   1960684   0% /dev/shm
/dev/sda1               495844     56486    413758  13% /boot

[root@localhost ~]# lvextend -L +69GB /dev/mapper/VolGroup-lv_root   
  Extending logical volume lv_root to 74.57 GiB
  Logical volume lv_root successfully resized

Extend işleminden sonra resize2fs ile lvm e eklediğimiz disk alanını linux dosya sisteminde genişletiyoruz.

[root@localhost ~]# resize2fs /dev/mapper/VolGroup-lv_root 
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 5
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 19548160 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 19548160 blocks long.

df ile baktığımızda göründüğü gibi artık diskimiz istediğimiz boyuta büyüdü.

[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       74G  1.6G   69G   3% /
tmpfs                 1.9G     0  1.9G   0% /dev/shm
/dev/sda1             485M   56M  405M  13% /boot

Posted in File Systems, Linux on June 26th, 2012 by Kürşad DARA | | 0 Comments

ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the MySQL error log hatası

MySQL’de replikasyon yaptığım slave sunucuda bazı işlemler yapmam gerekti. Sonrasında;

mysql> CHANGE MASTER TO MASTER_HOST='xx.xx.xx.xx', MASTER_USER='slave_user' ,MASTER_PASSWORD='xxx'   ,MASTER_LOG_FILE='mysql-bin.001788' ,MASTER_LOG_POS=549864673;
ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the MySQL error log

hatasını aldım.

Tabii ki yapmak gereken çok basit

mysql> flush slave;
Query OK, 0 rows affected (0.00 sec)

sonrasında problemsiz devam edebilirsiniz.

Posted in Linux, MySQL on June 22nd, 2012 by Kürşad DARA | | 0 Comments

LVM disk resize işlemi

ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the MySQL error log hatası

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