How do I do RAID 4/5 *and* LVM?
Hi --
I have four 160 GB IDE disks, and wanted to install software RAID 4/5 *and* LVM, and wanted to ask a couple of brief questions:
a) Do I need LVM if I want to see a single partition (or can RAID do this for me)?
b) Do I first install RAID, then LVM? Are there any difficulties with these installs? (I have already successfully done LVM on its own)
c) Are there any reasons why I shouldn't use both RAID and LVM?
Thanks in advance,
Dave
Yes, create the RAID (MD) device, then layer LVM on top... Now, depeneding on your requirements, you may not need LVM (do you want/need snapshots, etc?)
Also, how are you connecting these disks? How many IDE ports are you using? I would recommend against any sort of master/slave setup, as you'll have difficulties with failure detection and won't get the best throughput.
- Herman
On Tue, 21 May 2002, Dave Newman wrote:
->Hi --
->
->I have four 160 GB IDE disks, and wanted to install software RAID 4/5 ->*and* LVM, and wanted to ask a couple of brief questions:
->
->a) Do I need LVM if I want to see a single partition (or can RAID do ->this for me)?
->
->b) Do I first install RAID, then LVM? Are there any difficulties with ->these installs? (I have already successfully done LVM on its own) ->
->c) Are there any reasons why I shouldn't use both RAID and LVM? ->
->Thanks in advance,
->Dave
->
->
->
->_______________________________________________ ->linux-lvm mailing list
->[email protected] ->http://lists.sistina.com/mailman/listinfo/linux-lvm
->read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
->
Quoted 2 lines · Dave Newman
I have four 160 GB IDE disks, and wanted to install software RAID 4/5 *and* LVM, and wanted to ask a couple of brief questions:
LVM on top of MD works very well, I'm using it on all my boxes with soft RAID. (MD == multiple discs == linux soft raid)
dooing MD on top of LVM is possible too, but makes no scense (IMHO)
OTOH if you just want one big partition (3x160GB) than there is no need for LVM.
Quoted 2 lines
a) Do I need LVM if I want to see a single partition (or can RAID do this for me)?
No, MD will do
Quoted 2 lines
b) Do I first install RAID, then LVM? Are there any difficulties with these installs? (I have already successfully done LVM on its own)
yes, first RAID than LVM, no problems to be expected.
Quoted 1 line
c) Are there any reasons why I shouldn't use both RAID and LVM?
No
Cu,
Goetz
Quoted 3 lines · Herman L. Knief
Yes, create the RAID (MD) device, then layer LVM on top... Now, depeneding on your requirements, you may not need LVM (do you want/need snapshots, etc?)
Well, LVM makes a lot of sense in case he changes his mind to go with a single partition later. In that case LVM plus fs shrinkers give him much more flexible options he doesn't have with MD alone.
Quoted 41 lines
Also, how are you connecting these disks? How many IDE ports are you using? I would recommend against any sort of master/slave setup, as you'll have difficulties with failure detection and won't get the best throughput.
- Herman
On Tue, 21 May 2002, Dave Newman wrote:
->Hi --
->
->I have four 160 GB IDE disks, and wanted to install software RAID 4/5 ->*and* LVM, and wanted to ask a couple of brief questions:
->
->a) Do I need LVM if I want to see a single partition (or can RAID do ->this for me)?
->
->b) Do I first install RAID, then LVM? Are there any difficulties with ->these installs? (I have already successfully done LVM on its own) ->
->c) Are there any reasons why I shouldn't use both RAID and LVM? ->
->Thanks in advance,
->Dave
->
->
->
->_______________________________________________ ->linux-lvm mailing list
->[email protected] ->http://lists.sistina.com/mailman/listinfo/linux-lvm
->read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
->_______________________________________________
linux-lvm mailing list
[email protected]
http://lists.sistina.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
Signature · 15 lines
Regards,
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
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Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
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Germany
[email protected] +49 2626 141200
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