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RAID 5 risk Factors

post #1 of 12
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I want to purchase a 4-bay Nas storage device and build anhardware RAID5. Been reading some stuff and watching ytube videos to educate myself and everything seems to point that RAID5 has a great chance of failure. Also there are posts that drives with 8Tb and more are way more prone to result in failure.

Anyway i was thing of 4x3Tb Raid.

I recently heard of the term URE (UNTECOVERABLE READ ERRORS).Does that entail unreadable sectors? So a drive doesnt have to fail completely, even if a small sector is unreadable does that deem the drive unusable and could mean everything could go to waste?
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post #2 of 12

RAID5 is good in that it provides you one disk worth of redundancy, you can lose one disk and still maintain all your data.

 

The issue comes when a drive dies and you need to rebuild the array. Upon replacing the dead disk the controller will start to copy over data and parity information from the remaining healthy drives. What this does though is put a tremendous load on the remaining drives, increasing the risk of one of them failing. If another one fails during the rebuild, your data is gone.

 

RAID5 was perfectly viable when hard drives were <500GB in size because the rebuild would be fairly quick so the chance of losing another disk would be lower. Now we're looking at 3TB, 4TB or even a lot higher the chance of losing your data is pretty likely. Large arrays can literally take days to rebuild while putting the disks under a large load.

 

In a 4-way RAID I would recommend RAID10 or RAID5. Pick 5 if the data isn't that important OR if you have a reliable backup, pick RAID10 if you value your data more. Another benefit of RAID10 is there are no parity calculations so a RAID controller isn't needed, you can do it in software and read/write speeds will be really good.

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post #3 of 12
All like Twerk said. i personally go with raid 10 in my 4 disk setup. Get some extra umph from the raid 0 part too.
post #4 of 12
Thread Starter 
Too expensive you lose half your size with raid 10
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post #5 of 12
Quote:
Originally Posted by therock003 View Post

Too expensive you lose half your size with raid 10
Then RAID5 is the only option. There is a risk so as long as you're aware of that it's fine. Just maintain good backups.
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post #6 of 12
If that is the case then make sure you have a reliable backup. Working in data recovery, I cannot tell you how many people think RAID 5 is bullet proof. I can tell you from experience on attempting to recover from them it is not.


One of the other issues you can get with RAID 5 is if the parity information gets out of sync with the data. When this occurs, a recovery may or may not be recoverable. I have been able to get some data back in theses cases but usually results in a lot of corrupted files.

BTW, multi-disk failure in a RAID 5 is also a nightmare. And remember, RAID 5 is REDUNDANCY and not a backup.
 
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post #7 of 12
Quote:
Originally Posted by Lord Xeb View Post

If that is the case then make sure you have a reliable backup. Working in data recovery, I cannot tell you how many people think RAID 5 is bullet proof. I can tell you from experience on attempting to recover from them it is not.


One of the other issues you can get with RAID 5 is if the parity information gets out of sync with the data. When this occurs, a recovery may or may not be recoverable. I have been able to get some data back in theses cases but usually results in a lot of corrupted files.

BTW, multi-disk failure in a RAID 5 is also a nightmare. And remember, RAID 5 is REDUNDANCY and not a backup.

Whats your thoughts on a raid 10.
post #8 of 12
RAID 10 isn't bad but the two mirrors can become desynced or you can have damaged data clone over to the other RAID 0. Seen it happen many times.
 
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post #9 of 12
Thread Starter 
Every time i decide to get informed about RAID practice it quickly becomes apparent that There's so much to worry about. Now there the information that parities and mirrors can get desynced. So even if one drive fails and the others are healthy you still may not get a functional recovery.

Since were not enterprises to work with the tens and hundreds of drives on expensive hardware raid configs on RAID6, can we expect something beneficial on a 4 drive setup?

Granted data is not going to be important, its going to be digital files of media, but still why have something that fails and have to lose an entire collection of something, or being forced to spend 200euros to replace a faulty drive, and then waiting hours and hours for a rebuilt that may or may not be desynced, to have access to your data once again

IT seems so inconvenient, and i'll probably go again for a JBOD
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post #10 of 12
Quote:
Originally Posted by therock003 View Post

Every time i decide to get informed about RAID practice it quickly becomes apparent that There's so much to worry about. Now there the information that parities and mirrors can get desynced. So even if one drive fails and the others are healthy you still may not get a functional recovery.

Since were not enterprises to work with the tens and hundreds of drives on expensive hardware raid configs on RAID6, can we expect something beneficial on a 4 drive setup?

Granted data is not going to be important, its going to be digital files of media, but still why have something that fails and have to lose an entire collection of something, or being forced to spend 200euros to replace a faulty drive, and then waiting hours and hours for a rebuilt that may or may not be desynced, to have access to your data once again

IT seems so inconvenient, and i'll probably go again for a JBOD

There's risk with anything, RAID arrays becoming desynced is rare, but it can happen. RAID6 can fail, RAID1 can fail, nothing is safe.

 

Using no RAID, you can still get cryptolocker, malware etc which will result in losing your data.

 

Backup! Have all your important data in two places locally (backup to an external HDD for example) and your really important data in 1 place off-site (Dropbox, Amazon etc).

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