From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wols Lists Subject: Re: seagate-"archive"-disks with raid6? Date: Sat, 13 Jun 2015 21:47:57 +0100 Message-ID: <557C96FD.60004@youngman.org.uk> References: <557C5330.1090605@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mikael Abrahamsson , wiebittewas Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 13/06/15 21:11, Mikael Abrahamsson wrote: > On Sat, 13 Jun 2015, wiebittewas wrote: > >> 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