Re: [PLUG] BTRFS RAID massively broken

Stephen,

My home office systems are quite bit bigger, so not sure I can help with suggestions.

I have 2 dedicated units for storage

I have a old Thecus N8800 rackmount unit running Linux with 8 x 3TB drives, XFS RAID-10

this is mostly targeted for tier-3 backup. Unit not great at running VM's along with any

sequential access ( such as a copy / migrate ), so I only use it now for backup of the

unit below and storing laptop image backups, etc.

And a homebuilt NAS, with Dell 2950 rackmount with 32GB RAM, with 6 x 2TB SAS (3 mirrors) and

2 x 80GB Intel SSD for ZFS Slog and L2ARC. This unit is running FreeNAS (on BSD)

This runs multiple VM's in an vSphere 6 lab cluster. FreeNAS runs from USB stick.

The performance of this unit far exceeds any local server disks or the Thecus.

There is a page here about building the NAS storage:

http://plone.4aero.com/Members/lmarzke/howto/zfs2950/zfs-storage-on-dell-2950-project

The unit was built first using SmartOS, but I later converted it to FreeNAS. ( It needs to boot

from USB so all 6 drives are usable for the array , and both SmartOS and FreeNAS

are designed to do this without burning out the Flash stick. FreeNAS is VMware VAAI complient

as well.

Lee

From: "Stephen R Guglielmo" <srg@guglielmo.us>
To: "Philadelphia Linux User's Group Discussion List" <plug@lists.phillylinux.org>
Sent: Friday, August 12, 2016 12:39:21 PM
Subject: Re: [PLUG] BTRFS RAID massively broken

-------- Original Message --------
Subject: [PLUG] BTRFS RAID massively broken
Local Time: August 11, 2016 4:33 PM
UTC Time: August 11, 2016 8:33 PM
From: lee@marzke.net
To: plug@lists.phillylinux.org

http://sdtimes.com/btrfs-raid-code-needs-rewrite/

Glad i've stayed away from BTRFS, I'm still on ZFS / FreeNAS for my storage array.

Lee

At home, I've have 4x 2 TB disks in btrfs raid6. For the last week, this has been my mood:
https://imgur.com/wsTFu4i

On a more serious note, I'm gonna have to buy an additional external HDD to transfer the data off. Any suggestions on what I should use to replace it? I run Arch Linux. Is ZFS-on-linux stable? Or should I just use mdadm?

-Steve

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Lee Marzke, lee@marzke.net     http://marzke.net/lee/
IT Consultant, VMware, VCenter, SAN storage, infrastructure, SW CM
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