Date: Tue, 2 Dec 2008 11:21:08 -0500 From: Jerry McAllister <jerrymc@msu.edu> To: Pieter Donche <Pieter.Donche@ua.ac.be> Cc: "mail.list freebsd-questions" <freebsd-questions@freebsd.org> Subject: Re: (no subject) Message-ID: <20081202162108.GD90039@gizmo.acns.msu.edu> In-Reply-To: <Pine.GSO.4.63.0812021048180.3801@hmacs.cmi.ua.ac.be> References: <Pine.GSO.4.63.0812021048180.3801@hmacs.cmi.ua.ac.be>
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On Tue, Dec 02, 2008 at 10:56:44AM +0100, Pieter Donche wrote:
> If one has a system with 7 500Gb SATA disks in a hardware RAID6
> (Areca Raid Controller), then (according to mail J.Chadwick 7
> Nov 2008) they will show up as da (following naming convention
> for scsi disks although they are not).
> RAID6 will allow about 2,5 Tb for the 'user' (roughly 1 Tb will
> be consumed by the parity information of RAID6).
>
> How will this 2,5 Tb space present itself at the time of initial
> install of FreeBSD?
> Will this be a single 'disk' ad0 ? .. correct or not (then what)?
It will start out looking like a single large disk /dev/da0.
>
> If FreeBSD is to put on the system as only operating system (Fdisk:
> "A = Use Entire disk"), then will the BSD-partitions will show up as
> ad0a (/), ad0b (swap), ad0d (/var) etc... correct or not (then what)?
>
> Page 427 of the FreeBSD handbook states that due to the use of 32-bit
> integers to store the number of sectors is limited to 2^32 -1
> sectors/disk = 2 TB. A layout could be
> a / 1Gb,
> b swap,
> d /root 20 Gb, (a /root partition is from an example of someone who
> claims that at boot FreeBSD checks the partions in background except
> for the / partition, by keeping / as small as possible, the time to
> boot can be mimimized .. correct? but will /root ever be something
> big ??)
No, it will not. Do not make /root a separate partition/filesystem.
Leave it in /
> e /tmp 20 Gb,
> f /var 20 Gb,
> g /usr 20 Gb
> this leaves 2420 Gb which is more than 2 Tb, so you can't put all
> that in 1 filesystem h /home, you will need to split that in 2
> BSD-paritions, but since you can't have more that 8 BSD-partitions
> (highest BSD-partition letter is h), you need to give up at least
> one of d, e, f, g. ... correct or not (then what)?
If you really need this much disk, there must be a reason.
What do you intend to put in it? My suggestion would be to
put a lot more in /var because that is where data base utilities
default to putting their data.
Then you can reduce the amount left over to what would fit in /home.
So,
a: 1 GB /
b: 4 GB swap
d: 7 GB /tmp
e: 20 GB /usr ports can just be left here then
f: 1024 GB /var databases live here
g: remainder /home (Approximately 1536 GB)
You can shift this around as you need.
Maybe 2048 GB /home and 512 GB /var
////jerry
>
> What is the best scheme of BSD-partitioning in this case?
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