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Author Topic: Simple question regarding RAID  (Read 4236 times)

ChosenGSR

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Simple question regarding RAID
« on: February 15, 2011, 08:17:18 AM »

I'm new to RAID all together so I have what is probably a very simple question.  What happens when the device (DNS-323) dies?  Assuming the drives were configured in a RAID1 scenario.  Is RAID something that depends on the implementation of the particular device in question or is it some sort of standard?  Meaning could I just take my drives and plug them into another device that supports RAID1 or do I need the same exact device in order to get my data?  Or is it that RAID has nothing to do with this and the file system of the drives what really matters in regard to where I could plug the drives and get to the data?
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urbang33k

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Re: Simple question regarding RAID
« Reply #1 on: February 15, 2011, 09:40:57 AM »

Fantastic question, I too would like to know the answer to this.  I have read that someone here pulled his raid 1 drives out of a defective dns323 and dropped them into a new dns323 and it worked.   

I don't however know if you could take your array out of this device and drop it into another model or manufacturer that uses EXT 2/3 and expect your data to be intact and accessible. 

I look forward to hearing the answer to this.
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fordem

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Re: Simple question regarding RAID
« Reply #2 on: February 15, 2011, 01:10:18 PM »

urbang33 - you're in an experiment mode - why not find out for yourself - nothing like first hand experience.

ChosenGSR - the first thing I'm going to tell you is to read my signature - having your data in a RAID1 array does not mean that you can break with the time tested practice of backing the data up.

You CAN remove the disks from a failed DNS-323 and install them in another DNS-323 and get access to your data, you can NOT expect to take your disks and put them in just any NAS and recover the data, most NAS units have their own disk partition structure and even if they use linux and can read the ext2/3 file system created by the DNS-323, the paritions are not going to be where they expect them to be.

You CAN mount the disks in a PC running linux and retrieve your data, and you CAN mount the disks in a PC running Windows and, provided you install the appropriate third party file system driver, retrieve your data.
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.

pearljam45

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Re: Simple question regarding RAID
« Reply #3 on: February 16, 2011, 08:28:55 AM »

fordem,

I would suspect that you can NOT load the disks in Windows with third party software and retrieve the data if the disks were originally in RAID setup.

Correct?
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Wiggs

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Re: Simple question regarding RAID
« Reply #4 on: February 17, 2011, 09:16:30 AM »

fordem,

I would suspect that you can NOT load the disks in Windows with third party software and retrieve the data if the disks were originally in RAID setup.

Correct?
Not Correct. 

As fordem points out, this CAN be done by using a 3rd party driver such as http://www.fs-driver.org/download.html with Windows. 

I know.... I have done it.

Regards,

Wiggs
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Wiggs,

DNS-323, 2-500GB Seagate Drives, FW 1.08
D-Link DGS-1005G Gigabit Switch
Asus O!Play Air Media Player
WinXP PC
OpenSuse 11.2 PC
Macbook 5,2 - Snow Leopard

fordem

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Re: Simple question regarding RAID
« Reply #5 on: February 17, 2011, 01:22:52 PM »

fordem,

I would suspect that you can NOT load the disks in Windows with third party software and retrieve the data if the disks were originally in RAID setup.

Correct?

Thanks for bring this up - I should have mentioned it for the sake of completeness.

As Wiggs has pointed out - you can retrieve data from a RAID1 volume using a Windows system, you cannot retrieve data from RAID0 or JBOD.  Theoretically you can retrieve data from RAID0 and JBOD if you mount the both drives on a linux system and use mdadm to "recreate" the volume - note I say theoretically, I've never done myself.
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.