[Urgent] Replace Crashed HDD in NAS

[Killer Nads]

Hi guys,

I need some urgent advice.

I have a Synology NAS with 5 HDD's inside (Approx. 12 TB space), my 2nd HDD crashed today and volume 1 has failed. I don't have any sort of RAID backup option, just a automatic scheduled external HDD backup of the most important files that is always connected to the NAS.

At the moment i can seem to still access the files however, i can't edit, delete them or anything.

Now my question is, the NAS is saying to take HDD 2 out.

So, if i remove this HDD, will it cause problems with me accessing the files on the volume?
Will it kill off the whole volume?
or is it safe to remove the HDD and then replace it.


Which goes on to my next question, if i buy an exact same HDD as the one thats crashed can i make a one to one replicate of the crashed disk? or is it beyond that now?

Basically, what should i do? Im really worried, as i use my NAS daily and need an immediate solution.

Thank you.

 

[TyrOd]

IMHO the best freeware cloning tool is ddrescue. It is specifically designed for cloning HDDs that have bad sectors. You can run it from a Ubuntu Live CD.

See http://www.tomshardware.com/forum/299286-32-need-flexible-sector-copy-software-failing

A SMART report would help us to determine the physical state of your drive. You could CrystalDiskInfo or smartmontools for this purpose.

There are other tricks that can be done at the firmware level to improve your chances of data recovery, but they require some level of comfort with the DOS command line.

Killer Nads

Since you are able to read!
BACK UP your data NOW with ANY external USB

It may take long time and you may lost a little bit of data due to 2nd HDD failed.

That is the SAFEST and BEST option you have.
Once the data backup
Redo the NAS with redundant RAID like RAID5, do not use SPAN anymore
There is NO hope to recover your set up...

BTW: I hate these companies screw up all the terminologies and confuse users
JBOD is Just A Bunch of Drive - it is a multiple drives mode indivdually
When you combine indiscriminate HDD size, it CALLS "BIG/SPAN/LARGE/Concatenation" not JBoD

Why would there be no hope to recover from a drive with read errors?
Unless there's really serious damage to the platters a professional data recovery lab can do it.

Trying to back up a physically failing drive(which he's already doing a clone and skipping read errors) would be pointless now.

You're going to lose A LOT of data doing the clone the way you are, but a backup will be even less successful.

It's pointless to try to image a drive on your own that has a lot of read errors, especially since you have no idea what sectors to image to get your data. You're only putting more stress on the drive.

You should have sent it to a professional lab in the first place and it's not to late to stop what you're doing and do that now.