Add new hard drive in Debian

Its unfortunely that my disk array (RAID 5 with 4 hard drive) degraded because of a hard drive failed. For data safty issue, I have to back up all data and rebuild it again!

After rebuilt, I have to re-mount it again as new hard drive into my system.

Here is the procedure for notes.

At first, make sure the disk is the one I want to re-mount.
$ sudo fdisk -l /dev/sdc
Disk /dev/sdc: 1500.0 GB, 1499999502336 bytes
64 heads, 32 sectors/track, 1430511 cylinders, total 2929686528 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000 
Disk /dev/sdc doesn't contain a valid partition table
Its lucky I found it! And I'll create a new partition on it.
$sudo cfdisk /dev/sdc
Just follow those steps below...

  1. New -> Primary -> specify size in MB
  2. Write
  3. Quit

After that, I can see following message when success!
Disk has been changed. 
WARNING: If you have created or modified any
DOS 6.x partitions, please see the cfdisk manual
page for additional information.
Then, I have to format it before mounting.
$ sudo mkfs.ext4 /dev/sdc1
mke2fs 1.42.5 (29-Jul-2012)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
91553792 inodes, 366210812 blocks
18310540 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
11176 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848 
Allocating group tables: done                          
Writing inode tables: done                          
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
Okay, mount it now.
$ sudo mount -t ext4 /dev/sdc1 /data
Let's check it again.
$ mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=10240k,nr_inodes=764821,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=613144k,mode=755)
/dev/disk/by-uuid/62ac81e4-1ecc-4370-9628-25a3a831c5c8 on / type ext4 (rw,relatime,errors=remount-ro,user_xattr,acl,barrier=1,data=ordered)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=2397420k)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
/dev/sda3 on /home type ext4 (rw,relatime,user_xattr,acl,barrier=1,data=ordered)
/dev/sdb1 on /srv type ext4 (rw,relatime,user_xattr,acl,barrier=1,data=ordered)
rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
nfsd on /proc/fs/nfsd type nfsd (rw,relatime)
/dev/sdc1 on /data type ext4 (rw,relatime,user_xattr,barrier=1,data=ordered)
There is still a important thing must be done before we reboot or exist system -- Write back to /etc/fstab!
UUID=ac708cd1-3eee-4667-a881-71203bee93fc /data           ext4    defaults        0       2
Finally,it's done and I can restore data now!

Comments

Post a Comment

Popular posts from this blog

How to construct a B+ tree with example

Image
A B+ tree contains n-1 search key values K1K2…….Kn-1 and have n pointers.   In a B+ tree the data are ordered  sequentially.  The leaf node may hold up to n pointers and must hold at least N/2 pointers. The root node must hold at least two pointers, unless the tree consists of only one node.  Now we construct a B+ tree. Construct a B+ tree for the following set of key values: (2,3,5,7,11,17,19,23,29,31) Assume that the tree is initially empty and values are added in ascending order. Construct a B+ tree where the pointer number is Four. Solution: When a node exceeds n-1 search key value then we split it into two nodes. First node contains (ceiling(n-1)/2) values.  2 nd node contains remaining node. Copy the smallest search key value of the second node to the parent node. Let's start, we know each node has N pointer and has N-1 search key values. In our example pointer number is 4, so the search key value is 4-1=3. So each node has 4 pointers and 3 search key value. The first node i
Read more

How to show only month and year fields in android Date-picker?

Image
Android default DatePicker show day/month/year fields but you have to customize this DatePicker as your requirements. Suppose that you want to show only month and year fields in android datepicker . To do this, you have to customize the Dialog DatePicker source code but it is not an easy task. In this tutorial I will show you a tricky way to solve this problem. Lets see how to show only month and year field in android DatePicker as a dialog.   Step to show only month and year fields in android date-picker: Some days ago I got this same problem and here I am trying to explain this in a sequential manner. I want to show a dialog datepicker when user click on an EditText. So if user click on EditText, A dialog datepicker will be invocked and it will show only month and year fields. To do this, at first we have to create a xml layout to hold the EditText fields. So create an android project and name it DatePickerExample. In the main.xml file just try to write this simple code.  main.xml
Read more

Visitor Counter Script Using PHP

Image
If you have noticed that many websites display their total numbers of visitors.In this tutorial I am going to explain you how to create a simple visitor counter using php. For this, 1) Create one table called “visitor_counter” in your database. 2) Create file named “counter.php”. Step1: Creating “visitor_counter” Table CREATE TABLE `visitor_counter` ( `counts` int(10) NOT NULL default '0' ) Step2: Creating “counter.php” File <?php  // Database Details $host="localhost"; $username="root"; $password=""; $db_name="test"; $tbl_name="visitor_counter"; // Connect to server and select database. mysql_connect("$host", "$username", "$password")or die("cannot connect to server "); mysql_select_db("$db_name")or die("cannot select DB");  $sql="SELECT * FROM $tbl_name"; $result=mysql_query($sql); $rows=mysql_fetch_array($result); $counter=$rows['counts']; // se
Read more