Question about GTech G-TECH 907205-01 G RAID 2 500GB FW400/800USB STORAGE Network Storage

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Switching from 'Mirrored' to 'Striping'?

Hi.. We have currently upgraded our back up to a G RAID 2. I understand i need to switch it over so it 'strips' instead of 'mirrors' the files.

Please can anyone help me as how to do this??!!!
Thanks!

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I don't understand your description. sorry. But if you are switching over from Mirror to stripping then you will surely loose your files. Switching raid configuration will also redo the hard drive relativity and will reformat the drives automatically. If your backup is a server then you need to go to system bios and configure the raid from there. I suggest backup the backups first before you do it. If your backup is an external hard drive then go to its http settings and configure it there. It will surely format your drive.

Posted on Dec 11, 2008

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Product: LaCie 2big quadra ((Professional 2-Disk RAID. I have no back-up with the 2 disks, and this soon after purchase (August 2010). Serial number: 5102001839. Disk 2 does not work. At the front, light...


If the failed hard disk drive is replaced with the exact same capacity, RPM and make of hard drive, then the array can be rebuilt. Raid 0 cannot be rebuilt as each drive contains half of the data, If RAID 1 then can be rebuilt as data on each drive is an exact copy. However if combination of RAID 0 and RAID 1 then can be rebuilt. It's best really to handel this hands on, I recommend taking it to a computer technician especially if the information on it is important.

Thanking you
damnor01

Nov 13, 2010 | LaCie 2TB 2BIG QUADRA RAID EXT ESATA FW800...

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Implementing RAID 1 in Windows Server 2003 using VMware!


This is a simple tutorial about creating a RAID 1 in VMware for IT people. VMware, well I think you know already about Server Virtualization.Its a well known product.
Let's discuss about some of the techniques related to Load Balancing or Fault Tolerance.....The Disks here used are Dynamic Disks.
RAID - Reduddant Array of Independant (Not much Inexpensive these days. That term suites no more) Disks. There are two types of RAID:
  1. Software RAID - Implemented via the OS or with the help of a Software. Not much efficient however.
  2. Hardware RAID - Hardware level RAID. Much more efficient and Fault Tolerant.

The idea to use a set of disks or an array is to increase the performance (Load balancing) and provide Disaster Recovery (Folt Tollerant).
RAID 0 - StripingThe fastes of all the RAID configurations. This is known as Striping. Striping is the process of Writing data Sequentially to or Read from more than a single Hard Drive (or a Storage Device).First the data is broken up into chunks or blocks. Then the writing process will be accomplished. The process of writing will be done Simultaneosly onto Strips. The performance of reading and writing increases because all the Heads are working all the time
RAID 1 - Mirroring,DuplexingAs the name implies, it creates a Mirror of one Disk onto another. Data will be written to Both the Disks. So if one disk fails other one can be mounted or it can be used to Restore data.There can be a deadlock how ever. The Disk Controller. RAID 1 uses a Single Disk Controller thus a Single point of failure.We can avoid this easilly with the use of Disk Duplexing which means usage of 2 Disk Controllers.
RAID 2 - Striping with ParityThis is similar to RAID1 but with an added feature known as Parity. One disk - typically the last one - is used to store somethings called Parity bits. With the use of these Parity Bits, the lost data can be easilly generated. This uses Logical XOR Operation. When writing, it XORs every data written onto HDDs and stores in the Parity Disk. When one Disk fails, thet PD is XORed with other Data bits on the functioning Hard Drives. This is a very effective technology in terms of Fault Tolerance. But Performance is pretty low.
RAID 3Similar to RAID 2 but instead of using Strips which are in Bits this technique uses Strips in Bytes. That increases the performance over RAID2.
RAID 4Strips data (Blocks) and uses a Parity Disk. Requires at least 3 Drives. Not widely used.
RAID 5The most popular method. Requires at least 3 Disks. Disks are used to store Parity data as well for each perticular drive. Data Stiped in Bytes (uses block-level striping with parity). Supports Unlimited number of Drives. Failure rate Drops when the number of devices increas.High speed reads can be performed. But writing is pretty slow in this approach.
Note: The non-standard RAID levels 5E, 5EE and 6E extend RAID 5 and 6 with hot-spare drives. Other non-standard RAID levels include: RAID 1.5, RAID 7, RAID-DP, RAID S or parity RAID, Matrix RAID, RAID-K, RAID-Z, RAIDn, Linux MD RAID 10, IBM ServeRAID 1E, unRAID, and Drobo BeyondRAID.
So how are we going to implement such a structure in VMware?That is quite easy. This is an example of Disk Mirroring. Each disk has to have Similar Capacity.
  1. Click on "Edit Virtual Machine Settings".
  2. Click on Add ->Next-> Create new Hard Disk.
  3. Select SCSi.
  4. Give a Suitable Disk Capacity for new Disk.
  5. Give a "Name" and Browse the storage location.
  6. Click on Finish.
  7. You have to Repeat the steps to create the number of Disks that you require. You have to have 2 Disks. Do not use the Main Drive. Use Separate Disks.
  8. Click on OK.
  9. Click on "Power on this Virtual Machine".
  10. After booting up the machine, its the time to implement the Mirrors.
  11. Log in.
  12. Right click on My Computer and select "Manage".
  13. Click on "Disk Management".
  14. Get the "Convert Disk Wizard".
  15. Select the 2 disks (tick on the check boxes).
  16. Click "Next -> Finish
  • Implementing RAID1
  1. Right click on the Disk n which your first added drive (n = the number).
  2. Select "New Volume".
  3. Select the option "Mirrored".
  4. Click on "Next".
  5. Add the Disks from the left hand list box to the right hand list box (the two drives that you have created).
  6. Click on "Next".
  7. Assign a Drive Letter.
  8. Format using NTFS. Make sure you provide a "Volume Label".
  9. That's all what you need to do!
  10. Wait until the Volumes get formatted and Synchronize.
  11. Implementation of the other technologies are similar to the above procedure.
Hope you would enjoy this tutorial.Thanks!
-Lasitha

on Jun 30, 2010 | Network Storage Systems

1 Answer

Backup slow


Hi,
You don't specify whether previously on your USB it was the same lacie external or whether it was a different external drive. It sounds like you were using a different external drive, most likely a single drive.
You've specified that you've got your lacie setup in raid 5. Raid 5 gives a very good read spead and a good redundancy for incase a drive fails, however it's write speed is very very slow.
It will be much slower than a single drive on USB for writing to it (i.e. backups), but you should see a huge performance boost in reading from the drive than your previous usb.
If you need it to be faster, you would be better suited looking at configuring it for one of the following raid setups:
Raid 0: striping (not recommended for backups) - data is split over all drives, however if 1 drive fails you lose all data.
Raid 10: striping + mirror . half the drives are striped (like above), but the other half mirror the striping half so if one drive fails there's a backup of it. You only get half the disk space though, so if you have 4 x 1Tb drives, then you'll only get 2Tb of space.

Apr 06, 2010 | LaCie 2500 GB Network Storage Server

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Iomega StorCenter 1TB (2x500gb) no longer working with AFP


are the users correct? can you acces the storcenter web?
perhaps there's something incorrect after the halt.

Dec 26, 2008 | Iomega StorCenter Pro NAS 150d (33612) 500...

5 Answers

Nas SCM400 not working


The reason that it goes into recovery mode is because RAID5 is not striping so it has to rebuild the drives to be compatible with RAID5. I used 1TB drives and the 'recovery' took about 16 hours. It would be faster on smaller drives.

This is not a fault in the design, it is how RAID5 works.

Aug 23, 2008 | VisionMan VisionVault 4TB Smart NAS...

1 Answer

Different RAID configuration?


Hi,

The first point to note is that this unit does not support more than 1.6TB total disk. (4 x 400GB drives) This is stated in the manual which is on the CD that came with the unit. You cannot configure a mix of RAID1 and Linear (JBOD) drives, so you plan will not work.

Jun 18, 2008 | Network Storage Systems

2 Answers

Can't see the folders after restarting SS400-e


If you check their website, you will find:
Upgrading from a previous version of the firmware (to version 1.4) is a “data destructive” process.
it is strongly recommended that you first backup your existing data to another system in your environment. It is also recommended that you understand your current configuration of users, groups and shares to be able to recreate this under the 1.4 firmware.

Apr 05, 2008 | Intel SS4000-E (SS4000ENA)

2 Answers

Raid 5 crashed


Hi Chris,

How many drives are part of the array and what type are they? Are the drives making any unusual sounds like clicking or screeching? If not, then you should be able to recover the data. If the drives are making clicking sounds, you will probably need a professional data recovery service that specializes in Raid 5 data recovery to help you.

If the controller shows that only 1 drive is bad, you should be able to rebuild it by replacing that drive. If the controller shows all the drives are bad, then it is most likely a problem with the Raid 5 controller itself. In this case, you could try putting the drives in a working version of the same enclosure/controller.

Check the obvious also, like loose connections to the drives. Whatever you do, dont force a rebuild as this will probably result in permanent data loss.

Wesley Gill
Gillware Inc.
Raid Recovery Info

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2 Answers

Iomega Storcenter changed RAID after restart now reads 0gb used of 0gb available


Hmm... you could try removing the drives from the NAS device and plug them into either a SATA or EIDE cable in your PC. That way you can at least try to get your data off. If they were truly set for mirroring, then both drives should have the same data... so if one doesn't work, try the other. It may be a failed drive has the backend loop hung up.

Aug 22, 2007 | Iomega StorCenter (33349)

1 Answer

Help please to restore the failed raid


Well if your data is gone at this point, you mines well just proceed with rebuilding a new RAID 5 set with your replacement drive. Even if one drive fails in a RAID 5 set, your logical drive should still be accessible. Goodluck.

Jun 14, 2007 | Quantum Guardian 4400 120 GB Hard Drive...

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