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I was checking Development MySQL server (what did you know, I am not that lazy) and I found errors at /var/log/messages, I assume the secondary HDD (/dev/hdb) failed. Fiuh, I am lucky configured this server using Software-Raid1 otherwise all data has gone.

Jun 19 15:51:56 dbdemo smartd[2117]: Device: /dev/hdb, 37997 Currently unreadable (pending) sectors
Jun 19 15:51:56 dbdemo smartd[2117]: Device: /dev/hdb, 37997 Offline uncorrectable sectors
Jun 19 16:21:57 dbdemo smartd[2117]: Device: /dev/hdb, 38010 Currently unreadable (pending) sectors
Jun 19 16:21:57 dbdemo smartd[2117]: Device: /dev/hdb, 38010 Offline uncorrectable sectors
Jun 19 16:23:47 dbdemo kernel: hdb: task_in_intr: status=0x59 { DriveReady SeekComplete DataRequest Error }

Luckily, uncle Google very nice to me and show me article on Howtoforge.com, following the article I am confident to replace failed harddisk. Below is my Raid configuration:

Array: /dev/md0; Member: /dev/hda1 /dev/hdb1; Raid: 1; Filesystem: ext3fs; mountpoint: /boot
Array: /dev/md1; Member: /dev/hda2 /dev/hdb2; Raid: 0; Filesystem: swap; mountpoint: swap
Array: /dev/md2; Member: /dev/hda3 /dev/hdb3; Raid: 1; Filesystem: ext3fs; mountpoint: /

Summary of Howtoforge’s article is below:

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From: FelipeCruz

To add swap partition use command

# mkswap /dev/hdb2
# swapon /dev/hdb2
# vi /etc/fstab
# /dev/hdb2   swap   swap   defaults   0 0

With assuming you already create /dev/hdb2 partition before using fdisk and chose swap filesystem.

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Once upon a time when I tried to create a folder using ftp client on the server, I get error "cant create directory gallery: read-only filesystem".

After googling a while I found the solution on Always Hosting Forum. And the only way to resolve it permanently is by running fsck utility on linux single mode before mounting the harddrive. Yes there is a temporarily solution by restarting the server, but when the system is about to write into failed inode it will freeze, daemons stop responding, connections rejected, etc to make sure it wont cause more broken inode will lead into data corruption.
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Add this line into crontab, change /home2/backup with your own folder and 7 with numbers of days.

@weekly find /home2/backup -mtime +7 -type d -depth -exec rm -r {} \;

I don’t know if there are any utilities out there to show the sums of folder size or by using “du” option. So here I create a small script to check, with looping of “du” command. you can give a paramater like

# ./foldersize.sh /var/lib/mysql

To show how much each folder/database have. So here foldersize.sh script

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