Question about Iomega 34481 2000 GB Network Storage Server

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Can't switch from mirroring to single disk.

It says that raid conversion failed "100"

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One of the hard disks in there has failed - you need to find which and replace it before continuing with the conversion.

Posted on Jul 06, 2010

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My Mac no longer recognizes the drives


Raid 1 mirrors the disks, but they are still in an array. You need to identify which disk of the two failed. Replace the bad one and let the unit rebuild the raid if it can. This could take hours. Independently, I have not found them to work alone. They need the built raid array. I lost a ton of pictures on a 4 drive raided array that lost one drive, even though they were raided mirror.
Best bet is to see if your manufacturer will guide you through the diagnostics and procedures to restore the array for that unit.

Nov 13, 2013 | Icydock Icy Dock MB662USEB-2S 3.5 Inch 2...

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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 | Computers & Internet

1 Answer

Model: HDD2H,does not detect the drive,took out the drive from caddy and plugged it in the PC, shows RAW file system. One of them can be detected by bios but says 0MB,second drive shows as 500GB. Dont know...


If it was a "striped" RAID setup, then "half" of each file on the disk-drive has been lost,
including half of each entry in the Table-Of-Contents, when you try to "browse" either disk-drive.
Both disks will be "nonsensical".

If it was a "mirrored" RAID setup, then one disk is probably 100% "good", and one disk is probably 100% "bad", i.e., you now have just ONE copy of each file, rather than having TWO identical copies. Buy a new 500GB (or larger) disk-drive, and use the RAID-software to "rebuild" the "mirroring" (by copying everything from the "good" disk to the "empty" disk) setup.

Nov 03, 2010 | Iomega Computers & Internet

1 Answer

A DRIVE RAID 0 VOLUME IS FAILING GENERATION 2


> RAID

Rapid Array of Independent Disks

RAID logically combines several identical disk-drives for better performance or for better reliability.

For better performance, one RAID configuration "stripes" the data, i.e., when you write a block of data, the block is split into "stripes", and each stripe is written to a different disk-drive.
Since each stripe is smaller than the whole block, it is faster to transfer the data in "parallel".

For better reliability, another RAID configuration writes each block of data _identically_ to multiple disk-drives. Thus, if one disk-drive fails, your data still exists on the other disk-drives.
You can then replace the "bad" disk in the array, and use software to "rebuild" this "mirroring" of your data, by copying all the data from one of the "good" disks onto the "new" disk.

So, in your case, one of the disks in your array is failing. Identify it. Replace it. Rebuild your array.

Sep 26, 2010 | Dell 500 GB 7200 RPM SATA Internal for...

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

1 Answer

Ibm x235 raid manager reports scsi id#1 failed can you just replace disk or do you have to do something after you replace it to be seen by the system?


Just replace the disk. If it is part of a mirror, you have to make the mirror again on the new disk and make sure that all disks are compatible in size for the raid.

Nov 03, 2009 | IBM xSeries 235 (8671gax) Server

1 Answer

My 1 terrabyte Mybook drive says it needs the raid installed. It doesn't have a raid. It's not working and It's been my disk for my mac time machine backup. Can you get it working again? Here's the...


It sounds like this drive is configured with two drives running RAID 1 (mirroring). If one of the drives inside the case has been removed or has failed, it needs to be replaced with an identical drive so it can resume mirroring.

Raid 1 requires two had drives. Both drives are kept absolutely identical so that if one fails, the other continues to serve your files, but you will get a message like the one you have reported to let you know that a drive is missing or has failed.

If you look in the case and there is only one drive, but a place for a second, then someone has removed the drive.

If you look in the case and there are two drives, then the drive identified as Drive B has failed or has become disconnected, try re-seating the drive and check any cables or power connections. If it begins to work then, you may have solved the problem, otherwise you will need to get an identical drive and put it into the case. The raid controller will automatically identify that a new drive has been installed, then it will partition and format that drive automatically and resume the mirroring process.

Sep 20, 2017 | Western Digital MY BOOK HOME 1TB EXT...

2 Answers

Data recovery


Unfortunately, a three disk RAID 5 can only tolerate a single drive failure. Is it possible that disk 0 and disk 1 were reversed? If so, then you might be dealing with only one failed drive and might be able to rebuild the RAID if you get disks back where they belong.

Otherwise, you will need to send the disks off to a data recovery service and hope for the best. This is only viable if the data is very valuable as this will be very expensive. Typically more than $1000 just to evaluate and diagnose.

Jul 09, 2009 | IBM eServer xSeries 225

2 Answers

I have hp proliant with raid 1+0 .I have 2 hard and usr in option


Sometimes shortened to RAID 10, RAID 1+0 is a particular combination of two different RAID levels: mirroring (RAID 1) and striping (RAID 0). The appeal of RAID 1+0 is simple: mirroring gives you the highest level of availability RAID offers, with the fastest rebuild times when a disk fails; while striping - using the proper chunk size - is the basis for high-performance I/O.

Jun 09, 2009 | HP ProLiant DL380 G4 Server

1 Answer

I am unable to turn on ide single drive


You need to turn the raid back on and go into the raid utility. Once in the raid utility u should see a function to Break or Delete the raid group. Do this and then the drive should revert to a non-member disk and therefore a single drive. Once this is done u can turn the raid off again.

Feb 02, 2009 | ASUS K8N-DL Motherboard

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