Dear all brothers,

 

Current I have WD RE-GP for Parity HDD, and WD AV-GP for data HDDs.

 

Due limit of local market for 36m warranty , which is best chose among:

 

Seagate Surveillance

WD Purple

WD Red

HGST Deskstar NAS

 

Thank you in advance

Either the WD Red or HGST Deskstar NAS should be ok. 

 

The Seagate Surveillance and WD Purple have a different use case so I would not use them in a typical unRAID application.

 

That is my opinion.

Either the WD Red or HGST Deskstar NAS should be ok. 

Yes, you want a NAS drive for your NAS. I'd get the lower priced one.

 

The Seagate Surveillance and WD Purple have a different use case so I would not use them in a typical unRAID application.

Video drives expect a sequential access workload, and are therefore optimized for it.

You didn't say where your local market is?

Hi there thuy-nam!

 

As for the WD drives you've mentioned, the Purple would be good choice for video surveillance and PVR/DVR type applications, but not that much for usage in RAID environment. And since it is a NAS/RAID drive you're looking for, I would recommend the WD Red drives because they're designed for 24/7 operation and are optimized for NAS/RAID type storage.

 

Hope this helps.

 

Cheers!

Welcome Mighty_Miro_WD! Nice to have someone from WD participate in our forums!

 

I have never used the Reds, as they have not faired very well is tests like the BackBlaze studies. But many users here use them and I have not noticed many failures here.

 

I personally tend to use the HGST (also owned by WD ), and they have been very reliable for me.

 

The typical use case for drives in unRAID arrays is spun down. Adding a few dozen gigs of data a week, and reading about the same, with a monthly parity check (that reads every sector on every drive in parallel (speed gated by slowest drive) is the normal load on my array. I think a lot of others are similar once they get their arraya setup and in a steady state.

I also use the HGST 7200 RPM models for my parity drive.

 

Since I write to all different drives at multiple times, the extra speed on this drive serves me well.

 

If your array consists of 3TB drives, the Seagate 7200 RPM 3TB drive works well in the parity drive role as it gets about 190MB/s

For 4TB the HGST 7200 RPM gets about 160MB/s

For 6TB the HGST 7200 RPM gets about 225MB/s

 

While your parity check speed is as fast as your slowest drive, Parallel writes to multiple data drives reveals benefit from a faster parity drive.

 

 

I tend to stay away from WD branded these days. It seems all of my older 2TB WD drives are getting weak sectors as time goes on.

Then there are a number of people with posts of difficulty on the WD 6TB RED drives. (but that's my personal take on it).