RE: [Cpqarray-discuss] Adding Disks to a logical Drive

[White, C. <Cha...@CO...>]

Ok... to try to answer your questions:=20

		1) Is it possible to add another disk to the RAID and grow
the /home
partition accordingly without losing the data on the /home partition=20
		there are two problems with that... 1) the disk geometry is
stored in the partition table, and this is where Linux looks first to =
get
the disk geometry. So even if increased your disk size, Linux would not =
see
the new disk size.  2)  I don't believe ext2 can handle the disk =
geometry
changing...=20

	2)  RAID Migration... (moving from one RAID level to a higher one)=20
Yes, this is supported under Linux, because it is all done on Firmware =
and
when you are done the logical volume has  the exact same size and =
geometry
as before... Linux is unaware that it is hardware RAID.=20

	3) ReiserFS
I have not tried growing a ReiserFS, but I have an e-mail into SuSE =
asking
about that... I'll let you know if I hear anything back.=20

	4) One logical volume or Many..=20
First, because of the way ext2 is designed it is better to have several =
file
systems instead of just one.   Now the question is:  to do one logical
volume with many partitions, or Many local volumes with one partition.
Because this is hardware raid, I don't think it really matters.  The =
data
with be stripped across all possible drives either way. =20

		-----Original Message-----
		From:	Bernhard Gschaider
[mailto:Ber...@un...]
		Sent:	Thursday, June 21, 2001 8:35 AM
		To:	cpq...@op...
		Subject:	[Cpqarray-discuss] Adding Disks to a logical
Drive


		Maybe this has been discussed on this mailing list, but I
can't access
		the archive of this list (seems like the link is broken)

		We're planing to use a ProLiant ML370 with an integrated
Smart Array
		Controller under RedHat 7.1.

		I've done a test installation that is working fine.

		I've got three 18 GB Disks and I've organized them into two
logical
		drives:
		- one disk on its own
		- two disks as a RAID-0

		On the single disk I've installed / , /usr , swap and other
partitions
		that won't need more space in the forseeable future. The
other logical
		disk is a single partition (/home).
		As my users are using lots of space this will have to grow.


		My questions are:
		- Is it possible to add another disk to the RAID and grow
the /home
		partition accordingly without losing the data on the /home
partition
		(according to the documentation this is only possible with
WinNT and
		OS2)?

		- Same as above: Switching to RAID-5

		- Similar question: adding a disk to the first virtual drive
and
		switching to RAID-1

		Other questions are:

		- Is ReiserFS better suited for the /home partition (right
now I'm
		using ext2, but the server isn't in use for the next week,
so I could
		easily change that) expecially with respect to partition
resizing

		- Is it better to organize all the phyical disks into one
logical
		drive and put /, /usr, /home etc on that huge drive


		Sorry for that awful lot of questions. Any help would be
most welcome.

		Bernhard

		--=20
=09
------------------------------------------------------------------------=
---
		DI Bernhard F.W. Gschaider
		Christian-Doppler-Labor f. Rechnergest=FCtzte Angewandte
Thermofluiddynamik
		Montanuniversit=E4t Leoben
=09
------------------------------------------------------------------------=
---
		Christian-Doppler-Laboratory f. Applied Computational
Thermofluiddynamics
		University of Leoben, Austria
=09
------------------------------------------------------------------------=
---
		EMail: 	Ber...@un...
		Tel:	+43(3842)402-9945	Fax:	+43(3842)402-9942
=09
------------------------------------------------------------------------=
---

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