Raid 5 failure

[Tayida]

My brother needs urgently an advice for a good recovering company.His Raid 5 failures and he needs to recover the data.He is based in Uk

[muratremix]

You're asking for a UK company here in Thailand forum?

Good luck.

[RichCor]

People who buy or build a RAID system should know how to diagnose and recover from type of loss the raid technique used is designed to cover. Even then, they need to have a good offline verified backup and recovery process.

If your brother is using a RAID array but doesn't understand it, why is he using it?

Wikipedia

[...] a basic set of RAID configurations that employ the techniques of striping, mirroring, or parity to create large reliable data stores from general purpose computer hard disk drives.

A RAID 5 comprises block-level striping with distributed parity. Unlike in RAID 4, parity information is distributed among the drives. It requires that all drives but one be present to operate. Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost.^[10] RAID 5 requires at least three disks.^[11]

[Tayida]

Richcor I no understand nothing about Raid,so I don't know what to answer.Muratremix,I know that,but I know that some UK companies has their cs here in Thailand.Maybe someone knows where they are and can refer the problem.

[muratremix]

Richcor I no understand nothing about Raid,so I don't know what to answer.Muratremix,I know that,but I know that some UK companies has their cs here in Thailand.Maybe someone knows where they are and can refer the problem.

I doubt there is any UK data recovery company here in Thailand.

If your brother is in UK, why don't he look for one in UK?

You're asking the impossible here.

[RandomSand]

https://www.google.co.uk/?gws_rd=ssl#q=raid+data+recovery+uk

Some adverts state "£120 fixed fee", which is cheap, but you'd still need to supply replacement hardware.

Edited August 31, 2014 by RandomSand

[Tayida]

He look at Recovery Data based in Wales,but feedback so bad.I hear that they have a cc here in Thailand.That's why I asked here and if someone knows other recovery company

[RichCor]

The 'standard' process for recovering from a disk failure in a RAID system is to replace the failed drive then allow or direct the system to recover. If that fails, then verify the integrity of the RAID storage system and do a RESTORE from BACKUP.

Trying to do data recovery from a failed RAID system is an expensive procedure as the people who specialize in it know the owner's are desperate.

[DogNo1]

I always recommend NOT using raid, instead using redundant hard disks with full copies on each. One you have backed or saved to one hard disk, it's simple to copy the contents of that disk to another disk or two. If your brother has a backup, it would be best to restore to a single disk. If he has no backup, he needs to consult a local technician to restore his RAID 5 array. It can't be done long-distance. If he doesn't know how to restore his RAID array, then a local computer repair service can do it for him. Tell him to look in the phone book for local computer repair.

[sustento]

I always recommend NOT using raid, instead using redundant hard disks with full copies on each.

That's RAID 1.

[delta7]

This may be of use: http://www.anandtech.com/show/8399/recovering-data-from-a-failed-synology-nas

[kaspercat]

If he lost the raid array and not more than 1 drive, can can download raid reconstructor and boot into a single drive windows and do a soft recovery of the raid. Once the raid is reconstructed, he can copy out all the data and build a new raid.

Painful but works. Did it several times.

[keeniau96]

There is a superb data recovery person here in Phuket, has his own clean room (actually a sterile glove box, much like the virus labs); have known him personally for years. I do not know if he works with RAID, has never mentioned it. Has an advert in Phuket Gazette, site is phuket-data-wizards.com.

[phazey]

If it's RAID5, just pull the damaged disk, replace with a new one and let it rebuild from parity.

[Paul944]

If 1 disk is in error, it is a matter of locating the faulty disk and replacing it with the same brand and model. Sometimes an equal or bigger size disk is also accepted. Depending on the RAID5 software, some command have to be given to initialize the new disk and to start the rebuild. I have good experiences with the HP hardware raid controllers, replacing the faulty disk was sufficient.

if 2 disks or more are in error you need an expensive disk recovery specialist.

[innerspace]

Key question... is it hardware, software or fake(mb) raid? Recovery process will vary for each.

Raid 5 can rebuild from a single disk failure but is a slow process and has been known to kill the other drives in the process. Recovery will need local hand on support, but any half decent it shop can do, no need for data recovery specialists.

If 2 drives have failed better remortage the house.

[Tayida]

Does anyone,at the end,use the Fields Data Recovery.....is its good?

[ETatBKK]

I always recommend NOT using raid, instead using redundant hard disks with full copies on each. One you have backed or saved to one hard disk, it's simple to copy the contents of that disk to another disk or two.

AGREED ! RAID is build for protecting the UP time of the system; BACKUP is build for protecting the integrity of data.

in commercial operation, we used to have both RAID 5 ( cost concern ), and a daily backup of the data.

at home, I used an one-on-one data replicate, copying data files from an active disk in their native formats into uncompressed duplicates in a backup disk. some replicates have sequential versions too. this is not a RAID 1.