On 13/06/15 21:11, Mikael Abrahamsson wrote:

On Sat, 13 Jun 2015, wiebittewas wrote:

quoted

for a larger archive, we're thinking about buying six
8TB-Archive-Disks from Seagate to build a 4+2 Raid6-Array.

now we've seen, that these disks are told not-recommended for raid,
because they lack ERC/TLER (like many desktop-disks)

Not only that.

You might want to read:

http://www.spinics.net/lists/linux-ide/msg50641.html

These drives are different beasts than regular HDDs, and we seem to be
seeing problems with them just the way SSDs were problematic in the
beginning.

So you might want to reconsider using SMR drives for RAID use. I was
considering them until I read up on them, and then I decided it was too
early in the deployment cycle to use them for RAID use.

I didn't know these were shingled drives ... does the OP know what a
shingled drive is?

Basically, to get decent performance out of these drives, you have to
stream data at them - they're more like a tape-drive than a
random-access disk. So. They're great for backups, much less so for
normal use.

Cheers,
Wol