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WD Red compatibility ?

davidjames1701

Occasional Visitor
Hi, I have four WD Red 3TB EFRX models in my DS 1019+ in Raid 5, I'd like to add a fifth HDD in the fifth slot to fill my NAS, would the latest model, a WD 3TB WD30 EFAX, still be compatible with my Raid 5 array ?
 

microchip

Very Senior Member
EFAX are SMR drives and I'd avoid them for a NAS
 

bbunge

Very Senior Member
I recently bought a Synology two drive NAS for a client as a package with drives. Had the option of WD or Seagate drives. I chose WD as I trust their reliability. The drives were SMR. After much research I learned that SMR drives seemed to only have issues with ZFS and Synology does not use that.
You should be OK with your WD drives.
 

kamina

Regular Contributor
I understood Synology removed them from the compatibility charts because they caused issues for users.

ZFS has serious issues, but thats not to say BTRFS does not - most of the sites investigating just used ext4 (no issues) or zfs (issues).
 

microchip

Very Senior Member
I recently bought a Synology two drive NAS for a client as a package with drives. Had the option of WD or Seagate drives. I chose WD as I trust their reliability. The drives were SMR. After much research I learned that SMR drives seemed to only have issues with ZFS and Synology does not use that.
You should be OK with your WD drives.
That's not true. SMR drives perform worse all over the charts, regardless of file systems. Especially writes can bring it to a halt. There's a lengthy article at Ars Technica that shows that
 

davidjames1701

Occasional Visitor
Thanks guys, I understand the difference between CMR and SMR drives now, WD list their CMR and SMR drives, CMR seems the better choice, i used Raid 5 when i recently set up my DS, didn’t know anything about SHR, which i know know seems to have advantages like the use of different size drives etc, can i migrate from Raid 5 to SHR without loosing data ?
 

bbunge

Very Senior Member
With RAID 5 you should be able to replace the drives one at a time and allow the system to sync before doing the next. Start with your fail over spare then fail each drive in turn.
Still feel the SMR drives will be Ok for you.
 
Last edited:

davidjames1701

Occasional Visitor
With RAID 5 you should be able to replace the drives one at a time and allow the system to rsync before doing the next. Start with your fail over spare then fail each drive in turn.
Still feel the SMR drives will be Ok for you.
ok thanks. I'll look into that
 

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