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Topic # 84907 10-Jun-2011 13:00 Send private message

Hi - we have (had!) a two drive Stardom NAS device here at work for our onsite archiving of files.

The drives where RAID 1 and I understand the onboard OS was linux.

Unfortunately the device enclosure itself has completely died but both drives appear to be in perfect order (as indicated by local IT shop).

I have seen recommended elsewhere in these forums a D-Link DNS-320 device. In theory I could purchase this, drop in drives, format and away I go .... except for loss of data of course.

Just so you know - I have an offsite back-up of very nearly all the data so I'm not sweating thing too hard here.

Now for the questions

1. Is the D-link 320 device a Unix software RAID too ? 

2. What is the possibility of dropping in the two drives and still using the data in a RAID 1 configuration as if nothing had happened?

Sorry can't post a product link yet but forum topic below has details of D-link 320 device.

http://www.geekzone.co.nz/forums.asp?forumid=86&topicid=75854



 

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  Reply # 479712 10-Jun-2011 13:36 Send private message

Don't know what OS the Dlink boxes use, but I have used them a fair bit. Pretty sure they format the drives EXT3, so it could be some version of *nix. You could try and see, it may just work if your drives are EXT3 currently.

If not, you can get windows drivers for EXT2/3 and grab your data off before putting them in the enclosure.



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  Reply # 479735 10-Jun-2011 14:46 Send private message

Thanks for the swift reply. I think I'll go ahead, there's not much to loose really.

It's funny though - these NAS drives set-up with Raid 1  redundancy don't take into account device failure. I've been sitting here happy in the knowledge that if we have a drive failure we're covered ... yet the enclosure goes kaput and all bets are off. If I didn't have the offsite backup I'd be a worried man.

BTW - failure was due to a power surge. Despite the NAS being protected by a UPS, the power spike came via the network cable ... or so I'm informed by local IT crowd.

thanks again.
 

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  Reply # 479770 10-Jun-2011 16:04 Send private message

I doubt you'll be able to drop the drives in. The DNS-320 sets up a particular partition arrangement on the drives.

It does run some flavour of Linux, but I'm not exactly sure on the details.

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  Reply # 479775 10-Jun-2011 16:10 Send private message

ServerFault has an answer as always:
http://serverfault.com/questions/32709/how-do-i-move-a-linux-software-raid-to-a-new-machine 

Basically it sounds possible but does have some risk, in your case I don't see why you wouldn't give it a try.

As a side note: I have been researching what to use for on a NAS I'm planning at home and ZFS has some amazing features.  FreeNas and various flavours of Solaris/BSD/Linux can use it now.

ZFS is actually designed to be moved from OS to OS, machine to machine (as long as the OS supports ZFS) and RAID Z has much better write performance than RAID5.



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  Reply # 480589 13-Jun-2011 12:16 Send private message

Sheesh - the Server Fault article is a bit beyond me. I'm simply going to drop the drives into the new enclosure and see what happens. I'll update here when I'm done.

I still think people need to be aware that these software based RAID systems are not the sit-back-and-relax type of backup one might think. 

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  Reply # 480614 13-Jun-2011 13:27 Send private message

They are fine so long as the enclosure is OK. I agree that enclosure failure is a risk (but if it is from a large manufacturer, there should always be another enclosure available). The DLinks allow recovery from a broken drive in the enclosure.

I have used the Dlinks for about 4 years now, and not had one die (yet - touch wood).



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  Reply # 484314 22-Jun-2011 12:21 Send private message

Okay - just ready to purchase the D-link 320 and I thought I'd better check the drive comapatibility.

My drives are: Seagate Barracuda 500 gig   7200.10  ST3500320AS

The comapatible drive list from D-link states: Seagate Barracuda 500 gig   7200.10  ST3500630AS

As you can see there is a tiny difference in model numbers. Is this significant ?

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  Reply # 484913 23-Jun-2011 11:47 Send private message

I don't think that list has been updated for a while. For example, from memory I don't think there were many (or any?) 4K drives on the list, but it's been confirmed that firmware v2.0 supports them.

My guess is the list hasn't been updated since the 7200.11s came out.

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  Reply # 485201 23-Jun-2011 21:26 Send private message

webfish: Okay - just ready to purchase the D-link 320 and I thought I'd better check the drive comapatibility.


The D-Link 320 is an old model and isn't very fast, the newer model is the 325 and has been out for awhile.

I would take a look at the 2 bay Qnap and Netgear though, they only cost a little bit more than the 320 and perform better.

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  Reply # 485206 23-Jun-2011 21:38 Send private message

Ragnor:
webfish: Okay - just ready to purchase the D-link 320 and I thought I'd better check the drive comapatibility.


The D-Link 320 is an old model and isn't very fast, the newer model is the 325 and has been out for awhile.

Im pretty sure the 325 isnt for sale in NZ yet

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  Reply # 485218 23-Jun-2011 22:00 Send private message

Dlink are junk, avoid them. Synology is good choice.




Ross
ADSL2+ sync (Kbps): 11577/945, attenuation (dB): 33.0/16.9, Noise margin (dB): 11.5/11.5



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  Reply # 504315 10-Aug-2011 13:08 Send private message

Just an update on this topic. After careful consideration I purchased a Netgear Ready NAS Duo.

This machine has been brilliant - easy to set up and quicker than the old Stardom one.

The above drives worked fine in the new enclosure - although a complete wipe of the data was required as suspected.

Thanks for all the help.

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