Basically RAID5 = Z1, RAID6=Z2 and Z3 gives you another parity 'node' so you can tolerate 3 drive simultamiously.
http://nerdreport.mynotetakingnerd.com/renegadeliveretreat
So you lose a bit for parity, admin, and such - think around 25%. Imagine Z3 as RAID 5 with two areas of parity but a MUCH better filesystem.
The array Lab601 is talking about has 3 RAID arrays of 15 drives each with a virtualized files system over it so theoretically it could suffer six simulaneous drive failures - BACKBLAZE created the basic design and open-sourced it. Even with a generous admin/setup fee, sub-10 grand is a good deal from them (IMHO) for 90TB -- that's with 2TB drives but think abut 180TB if you use 4TB drives : )
Of course, with all large RAIDs you have remember the danger of losing another drive while rebuilding the array after losing the first one -- not a real problem with ZFS... if you think you know your linux well enough, 45 Drives http://45drives.com sells the hardwear exactly as they prebuild for Backblaze with no RAID drives with setup for EXT4 filesystem OEM - which would be linux-only.
John McClary
------------------------------
"There's Always A Solution"
From: Tony Quinsee-Jover <tony@hdheaven.co.uk>
To: "Avid-L2@yahoogroups.com" <Avid-L2@yahoogroups.com>
Sent: Sunday, April 21, 2013 9:14 AM
Subject: Re: [Avid-L2] Re: OT:archive family movies
Dave,
What kind of storage loss is the result of Raid Z1, Z2 and Z3?
T.
Sent by magic over t'interweb
On 20 Apr 2013, at 22:39, "David C. Ballard" <mailto:dave%40lab601.com> wrote:
> not sure, we price them by the current price of drives which is the big variable. we're using 2tb drives because of their inexpensive cost. you can start with 18tb(9drives) and add them in 18tb to fill up (if you want one huge volume), dont quote me but our cost is about 7k each for full 90tb with just gigE interfaces (that you can LAGG), then we just add a build fee on that. it's way better than raid 5/6 because it's 2parity zfs (doesn't accumulate data-rot), and way better than a drobo or synology and their proprietary hybrid format (if it fails you are screwed). it's for technically minded people though. we set them up but its up to you to administrate it from there. that's why it doesnt cost 135k like a barracuda backup server of the same size.
>
> David C. Ballard
> President & Creative Director | LAB 601, Inc.
> LAB 601 Digital Post
> 404.876.4601
> www.lab601.com<http://www.lab601.com/>
>
> From: "Job ter Burg (L2B)" <mailto:Job_L2%40terburg.com<mailto:mailto:Job_L2%40terburg.com>>
> Reply-To: "mailto:Avid-L2%40yahoogroups.com<mailto:mailto:Avid-L2%40yahoogroups.com>" <mailto:Avid-L2%40yahoogroups.com<mailto:mailto:Avid-L2%40yahoogroups.com>>
> Date: Saturday, April 20, 2013 4:26 PM
> To: "mailto:Avid-L2%40yahoogroups.com<mailto:mailto:Avid-L2%40yahoogroups.com>" <mailto:Avid-L2%40yahoogroups.com<mailto:mailto:Avid-L2%40yahoogroups.com>>
> Subject: Re: [Avid-L2] Re: OT:archive family movies
>
>
>
> What would such a beast set me back?
>
> On 20 apr. 2013, at 21:53, "David C. Ballard" <mailto:dave%40lab601.com<mailto:dave%40lab601.com>> wrote:
>
>> terry, i could build you one of these. http://lab601.com/services/lab-storage-pod/ what we use for spinning disk backup- always online and accessible
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Search the official Complete Avid-L archives at: http://archives.bengrosser.com/avid/
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