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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Valentin Bud <valentin.bud@gmail.com>
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Cc: freebsd-questions <freebsd-questions@freebsd.org>
Subject: Re: 5 TB server
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> tests with ZFS and
> some with UFS. On the ZFS side the most attractive thing is the backup
> and of course
> the easiness of administration.

don't get fooled.

>>
>> if i were you i would get any motherboard with 8 SATA ports, up to 8 1TB
>> disks, cheapest available CPU, good PCIe gigabit cards or two.
>
> 8x1TB with some mirroring + striping would equal how much in terms of
> available space? Sorry i have to do my homework regarding RAID :|.

gstripe of 4 gmirrors will give 4TB
graid3 or graid5 will give 7TB, but much lower I/O performance (same with 
ZFS raidz). if you mainly read/write large files it's OK.

With graid5 read performance is near gstripe only writes are slow, with 
graid3 or ZFS raidz both are slow.

To be exact - single reads are not slow, but I/O capacity is low so under 
concurrent reads it will be very slow.