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[Dangerous_Dave]

Hi all is anyone having a problem with there volume degrading every week? I am using WD 3TB Red drives. A couple of weeks ago the whole thing failed and I had to start from scratch. Lucky I had most of my data backed up. A week after I had to start from scratch the Volume degraded again, even after replacing one of the drives because it failed a short SMART test, is this normal? This is my first NAS, I bought it thinking that my data would be safe. Wow I couldn't be more wrong:(

I bought a DNS-345 at Easter and since then it has degraded at least every 10 days. If anyone is reading this and is thinking of buying one then don't. ****************************************

[ivan]

How are your volumes set up?

I find it strange that you have not reported the problem before now.  Have you removed the drives - noting which slot they were in - and tested them using the WD disk test tools?

Depending on how you setup the NAS you should be able to keep your data safe - two RAID 1 sets with the second acting as a backup to the first plus a backup to a removable 3TB drive should do what you are looking for.  This, of course restricts you to a maximum capacity of 3TB.

The DNS-345 we have under test (considering it as a replacement for the old DNS-343) is set up as above and we have not experienced any problems with it.  So much so, we are going to add it to our list of devices that we recommend to our clients.

Since your unit is still under warranty have you contacted your supplier with your problems?

One last thing.  If you demand absolute reliability and do not have backups then are you prepared to spend something in the region of $10,000 to $15,000 per year for a managed service supplier to take over the job of looking after your data because paying the odd hundred more for another NAS isn't going to cut it.

[Dangerous_Dave]

So after many months of testing, and working out what is going on the result is as follows.

If you never turn off your NAS then it probably wont degrade. I had a schedule setup in System management, Power management to turn off everyday at 07:30 and on again at 16:00. This was causing the volume to degrade. Why have this function if it does this? Why cant it shut itself down in a manner where it doesn't need to be rebuilt?

I've only shut it down twice in the last two months and both times its needed to be rebuilt. So its working a little better. I've still got other problems with it but this is the wrong thread for that.

[JavaLawyer]

How are your HDDs configured (i.e. Standard Configuration, JBOD, RAID-0, RAID-1, etc.)?

[Dangerous_Dave]

It's just a standard raid 5 config. I keep the rebuild settings as manual so I can tell when it has degraded.