Lee H. Marzke on 12 Aug 2016 13:29:07 -0700

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

Re: [PLUG] BTRFS RAID massively broken


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:

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.


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


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


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

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?


Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug

"Between subtle shading and the absence of light lies the nuance of iqlusion..."  - Kryptos

Lee Marzke,  lee@marzke.net     http://marzke.net/lee/
IT Consultant, VMware, VCenter, SAN storage, infrastructure, SW CM
+1 800-393-5217  office        +1 484-348-2230                       fax
+1 610-564-4932  cell           sip://8003935217@4aero.com    VOIP

Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug