|
|
RAID Troubleshooting
A RAID system is a collection of hard drives joined together using a RAID level definition. In level 0 RAID can be used to stripe drives together to give more overall access speed. In level 1 RAID can be used mirror drives. In level 5 RAID can be used to increase uptime of your overall storage by striping drives together and then keeping parity data, if a drive should fail the system keeps operating (level 5). This article described the solution of some common errors and problems in raid. A raid user can now easily troubleshoot these problems by following these steps that described in this article.
|
Common errors and their solution in RAID
Problems in SATA drives
Cause. This problem is due to the BIOS incompatibilities or faulty cabling.
Solution.
When you install SATA drives, make sure that the system has the latest version of its BIOS with SATA support.
Make sure the connectors are properly plugged. SATA uses a cable to connect each individual drive to the controller. There is no master-slave relationship, as there is with IDE, and thus no need to set jumpers or terminators when installing an SATA drive. In fact, some SATA drives have jumper blocks or terminators near the interface connector. They already set in factory mode and should not be changed.
Recovery error when using RAID.
If you have RAID 1, power lost but disk was active.
Solution.
You can solve this problem by using Raid tools. Raid arrays can be checked with ckraid /etc/raid1.confCalling ckraid /etc/raid1.conf --fix will pick one of the disks in the arrayed use that as the master copy, and copy its blocks to the others in the mirror
To designate which of the disks should be used as the master, you can use the --force-source flag. When you are comfortable with the proposed changes, supply the --fix option.
If you have raid 1, you lost power but there was disk activity.
Solution.
You can recover this problem by running this command.
mkraid raid1.conf -f --only-super block
If you have a RAID-4 or a RAID-5 setup and you lost power while there was disk activity still.
Solution.
You cannot use fsck to do preliminary checking, first you use ckraid.
The ckraid command can be safely run without the --fix option to verify the inactive Raid array without making any changes. When you are comfortable with the proposed changes, supply the --fix option.
How recover a file when it delete.
-
Recovers deleted files/folders even after recycle bin has been emptied or use of Shift+Del key.
-
File recovery from Missing or Lost folders.
-
Recognizes and preserves long file names when restoring files & folders.
-
Multi-Disk Drive Support - Performs FAT/NTFS, EXT2/EXT3 recovery on all IDE, EIDE, SCSI and SATA disk devices.
-
-
The data recovery wizard will read file system on selected volume and search the files.
-
You have to wait until scanning is finished .This step may take some time depending on the size of disk space.
-
Now you will see folder here.
-
The "Searching files" or "Find file by name" option makes finding the file you need much easier.
-
Select the files or folders that you want to recover and press the "NEXT" button.
-
The Saving process is going to complete.
|
|
How you can recover data from a drive containing deleted emails in your hard drive.
Follow these steps:
- On the main window of Data Recovery wizard click the "Deleted File Recovery" button.
- On your computer, you can see the list of all logical volumes you found.
- Choose one of them and press the "NEXT" button.
- This step may take some time depending on the size of disk space.
- You have to wait until scanning is finished.
- Otherwise Data Recovery Wizard may not be able to find and recover deleted Email files.
- After this step scanning is finished, you will see file/folder tree.
- You can check the deleted files by going through the directory in the left pane. You can also use "Searching files" or "Find file by name" function to locate the email files.
- You can select the file or folder that you want to recover and press the "NEXT" button.
- Select a directory and press the "NEXT" button to save the data.
How to recover a deleted Word document?
1. Click Start > Search > Files or Folders in your computer window.
2. Type the file name > in the Search for files or folders named box.
3. In the Look in box, click "My Computer".
4. When this step is finished click "Search Now". If the Search Results box does not show the file, continue with the following steps to search for all Word Documents.
5. In the Search for files or folders named box, type *.doc.
6. Click "Search Now".
If serial ATA not recognized in raid.
Solution.
- First step is to check that the power cable is connected from the power supply to the SATA drive.
- After that you check that the SATA data cable is firmly connected from the SATA drive to the SATA header on the desktop board.
- You should format the serial ATA drives before you use them.
- Make sure you have the latest BIOS version for your desktop board.
- Try a BIOS recovery.
This article describes the solution of some common errors and problems that may be faces a raid user during hard drive operations. However there are multiple redundant hard drives are connected to each other in raid so a user can easily troubleshoot these errors and problems by the help of this article.
|