Disk configuration recommendations

2008-07-11 Thread Steve Bertrand

Hi everyone,

We've just built a new network storage box that will replace an existing 
unit. The device is purely for storing a hot backup of server images.


The motherboard has four SATA ports, which I have connected to four 
500GB SATA drives.


I had full intentions on using either GEOM or ZFS (I'm just reading up 
on the latter now) to span the drives together (I don't care about 
redundancy on this unit).


I did not realize until yesterday that the motherboard my colleague went 
with has onboard RAID.


What I'm looking for are opinions on a solution to make this box as 
resilient as possible for the long term (eg: if the motherboard dies, it 
would be nice to drop the disks into another box).


Do you have any recommendations on how I should proceed? Hardware RAID, 
ZFS or GEOM?


Some info that may help guide recommendations:

- 4GB of memory
- dual core 2.2Ghz
- I have no problem having /boot on a USB key
- preferably /backup to be ~1.6TB
- like to have a small piece of the disk encrypted (directory or partition)
- would be nice to be able to easily (ie: dynamically) add storage 
capacity without wiping existing data
- three GigE NICs, so would like to pursue the possibility of perhaps 
using disk space of other nodes (or at least mounting it remotely)
- would consider a RAID 5 setup if a recommendation meets other 
(non-listed) design objectives


Thanks all!

Steve
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Re: Disk configuration recommendations

2008-07-11 Thread Steve Bertrand

Steve Bertrand wrote:

Hi everyone,

Do you have any recommendations on how I should proceed? Hardware RAID, 
ZFS or GEOM?


To answer my own post...

After a day of research, I decided upon ZFS.

I configured a raidz pool using all four entire disks.

I've put /boot on a USB thumb stick which I boot from, which allows me 
to mount / and the rest of the system directly from the ZFS pool.


This prevents me from having to have a UFS slice on one of the disks, or 
install another hard drive just to run the system from.


The idea was essentially copied from how I run my GELI systems. Boot 
from USB stick that contains the encryption key. Once the system is 
booted, I take the USB stick with me, which prevents access to the data 
if the machine is shut down.


Steve
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