Mailinglist Archive: opensuse (1125 mails)
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Re: [opensuse] simple data security: RAID1 or rsync?
- From: Anton Aylward <opensuse@xxxxxxxxxxxxxxxx>
- Date: Sun, 06 May 2012 22:00:59 -0400
- Message-id: <4FA72CDB.4070501@antonaylward.com>
John Andersen said the following on 05/06/2012 09:31 PM:
Yes, you *CAN* configure LVM that way.
it is one of the *MANY* ways you can configure LVM and because of that
it is a reason many people find LVM confusing and difficult to use. It
is fraught with decision alternatives you have to make.
That being said those alternative also allow you to do things like
mirroring, yes *REAL* mirroring. And you have the flexibility of doing
it on a file system basis, not just a drive basis.
Yes, you can also stripe across spindles and scatter-gather across
spindles with LVM and yes that will cause a catastrophe if you loose a
spindle. But no-one is forcing you to use that rather than mirroring.
The same applies with RAID. There are many ways of doing it and not all
offer reliability in the event of a loss of a spindle.
The OP mentioned the need to protect the data but no the OS.
using different strategies for different file systems is a capability of
LVM not enjoyed by RAID.
That too. LVM has many capabilities.
Don't focus on just one.
Hmm. Some configurations of RAID can be said to allow building big
volumes by spreading a file system across several small devices as well.
It all depends on how to choose to configure things, doesn't it?
I wouldn't call it 'forcing' any more than choosing a particular RAID is
'forcing'.
Some of that is so wrong as misleading that its not worth discussing.
That you can screw-up something though ignorance and inexperience
applies just as much to RAID as LVM ... or anything else for that matter
-- there are many examples of that in the software world!
--
Leadership is understanding people and involving them to help you do a
job. That takes all of the good characteristics, like integrity,
dedication of purpose, selflessness, knowledge, skill, implacability, as
well as determination not to accept failure. ~ Admiral Arleigh A. Burke
--
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
To contact the owner, e-mail: opensuse+owner@xxxxxxxxxxxx
As for mixing and matching size with LVM, its almost always an accident
waiting to happen. When your partition is scattered across multiple
drives, a failure of any one will likely take down everything.
Yes, you *CAN* configure LVM that way.
it is one of the *MANY* ways you can configure LVM and because of that
it is a reason many people find LVM confusing and difficult to use. It
is fraught with decision alternatives you have to make.
That being said those alternative also allow you to do things like
mirroring, yes *REAL* mirroring. And you have the flexibility of doing
it on a file system basis, not just a drive basis.
Yes, you can also stripe across spindles and scatter-gather across
spindles with LVM and yes that will cause a catastrophe if you loose a
spindle. But no-one is forcing you to use that rather than mirroring.
The same applies with RAID. There are many ways of doing it and not all
offer reliability in the event of a loss of a spindle.
The OP mentioned the need to protect the data but no the OS.
using different strategies for different file systems is a capability of
LVM not enjoyed by RAID.
LVM was not made for reliability, it was made to allow building
big volumes from several smaller devices.
That too. LVM has many capabilities.
Don't focus on just one.
Hmm. Some configurations of RAID can be said to allow building big
volumes by spreading a file system across several small devices as well.
It all depends on how to choose to configure things, doesn't it?
Its really not the right tool for the job, even if it can be
forced into that task.
I wouldn't call it 'forcing' any more than choosing a particular RAID is
'forcing'.
http://serverfault.com/questions/279571/lvm-dangers-and-caveats
Some of that is so wrong as misleading that its not worth discussing.
That you can screw-up something though ignorance and inexperience
applies just as much to RAID as LVM ... or anything else for that matter
-- there are many examples of that in the software world!
--
Leadership is understanding people and involving them to help you do a
job. That takes all of the good characteristics, like integrity,
dedication of purpose, selflessness, knowledge, skill, implacability, as
well as determination not to accept failure. ~ Admiral Arleigh A. Burke
--
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
To contact the owner, e-mail: opensuse+owner@xxxxxxxxxxxx
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