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Date:      Fri, 17 May 2013 18:15:06 -0500
From:      Joshua Isom <jrisom@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: ZFS install on a partition
Message-ID:  <5196B9FA.3090107@gmail.com>
In-Reply-To: <F744BBF1-D98C-47BF-9546-14D1A9CB3733@todoo.biz>
References:  <F744BBF1-D98C-47BF-9546-14D1A9CB3733@todoo.biz>

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Your hardware raid should be faster than ZFS raid.  Don't use zfs raid 
because there will be no benefit.  You'll get the performance of 
software raid using CPU time, along with lost space for already backed 
up data.

ZFS should work fine.  A lot of the tuning on the wiki page isn't needed 
anymore, so it's not too bad.  The biggest thing to be careful with is 
upgrading your zpool, every so often your boot blocks may need updated 
and if you forget, you can't boot.  You won't upgrade your pool often of 
course.  Reliability shouldn't be an issue, it's FreeBSD.  ZFS will make 
it easier to play around with jails, have fun and create a 1000 node 
beowulf on one system.

On 5/17/2013 5:24 PM, bsd@todoo.biz wrote:
> Hi,
>
> I have a question regarding ZFS install on a system setup using an Intel Modular.
>
> This system runs various flavor of FreeBSD and Linux using a shared pool (LUNs).
> These LUNs have been configured in RAID 6 using the internal controller (LSI logic).
>
> So from the OS point of view there is just a volume available.
>
>
> I know I should install a system using HBA and JBOD configuration - but unfortunately this is not an option for this server.
>
> What would you advise ?
>
> 1. Can I use an existing partition and setup ZFS on this partition using a standard Zpool (no RAID).
>
> 2. Should I use any other solution in order to setup this (like full ZFS install on disk using the entire pool with ZFS).
>
> 3. Should I avoid using ZFS since my system is not well tuned and It would be asking for trouble to use ZFS in these conditions.
>
>
> P.S. Stability is a must for this system - so I won't die if you answer "3" and tell me to keep on using UFS.
>
>
> Thanks.
>
>
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