Unfortunately, it is impossible to install this tool onto a Linux computer. The program lets you recover the lost data easily and quickly, and it doesn’t require special skills or professional background. This software solution supports recovery of lost files from almost all known RAID types. The product you need is Hetman RAID Recovery. If you lost important data and it needs to be recovered, try a specialized recovery tool from Hetman Software. How to Recover Data Lost from an LVM Array Here you can view the information that includes data on the devices and groups involved. Run the following command to check the LVM RAID status: lvs -a -o name,copy_percent,devices vg1 When these commands are performed, the selected volume will be mounted. Type the command mkdir /mnt/lvr5, and follow it with mount -t ext4 /dev/vg1/lvr5 /mnt/lvr5. This command contains information on the file system we have selected – ext4, the group name – vg1, and the volume name lvr5. The last step is to format the array and mount it. Vg1 – to tell the operating system where to take the required disk space from (specify a particular volume or an entire group).Īfter the command is performed successfully, the process of rebuilding a RAID 5 system in an LVM virtual group is over. The number you give should be 2 or more, because the minimum requirement for this array type is three disks. It doesn’t include an additional device to store parity blocks, though. i – to indicate the number of devices involved to store user data. L – to set a size limit for the logical volume (in our example, its size is 10 GB). In our example, the command contains the following attributes: Lvcreate -n lvr5 –type raid5 -L 10G -i 4 vg1 The process of creating a software RAID 5 suggests running a simple command in the Terminal: The attribute vg1 is the name of a new volume group. In our example, the command looks like this: vgcreate vg1 /dev/sdb1 dev/sdc1 dev/sdd1 dev/sde1 dev/sdf1. In the command prompt, type vgcreate, listing the created disks. Now combine all the drives into one group. Repeat the command for every drive, replacing the value sdb1 with the corresponding drive names (sdc1, sdd1, sde1, sdf1). Our further actions will be intended to create a physical volume in the new partition. Repeat this procedure for all unformatted drives and allocate their disk space. After that, record the changes with the attribute w. The device will be marked with the value sdb1 and have the system type Linux LVM. The operating system will process your request and show the data in the form of a table. In the command prompt, type the attribute p. Make sure that the new partition is of the required type. T – to start the process of modifying the type of the new partition, Apply the following attributes, each in its own line: P – to set the partition value as primary,Īfter that, press the Enter key twice to agree with the size of the first and the last sector. Specify the format settings by typing the following attributes, one by one: With the Terminal, use a special system command fdisk /dev/sdb.īefore the format process starts, make sure you have chosen the right drive, because this operation will make all data on the selected drive disappear (the operating system will erase it. Just select the necessary file system type and start the process of formatting the drives. It will remove the requirement to enter the password every time.Īfter that, use the disk utility or Terminal to allocate the disk space. For this purpose, type the command sudo -i. Perform all actions from the superuser account. Type the following command: sudo apt install lvm2. Install the manager with the help of the command prompt tool in charge of interacting with the package management system. Follow the link below to check our special video for details. If there is no LVM (Logical Volume Manager) tool on your computer yet, install it first. Use the command lvcreate to create an LV RAID. How to Format Disks and Create a Virtual Group for LV RAID Now let’s see how to create a RAID 5 system with 5 hard disks combined into a single group of logical volumes. LVM creates hidden logical volumes (DM devices), kind of placed between the visible volumes (known as LV, logical volumes) and physical devices. LVM RAID technology uses Device Mapper (DM) and Multiple Device (MD) drivers from Linux kernel.ĭM is used to create and manage visible LVM devices, while MD is used to allocate data onto physical devices.
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