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<H1>[Mageia-dev] time to switch from raw partitions to lvm?</H1>
<B>Buchan Milne</B>
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TITLE="[Mageia-dev] time to switch from raw partitions to lvm?">bgmilne at staff.telkomsa.net
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<I>Mon Feb 21 21:38:07 CET 2011</I>
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<PRE>On Monday, 21 February 2011 18:56:22 Jeff Robins wrote:
><i> > Michael Scherer wrote:
</I>><i> > > For a linux system, a lvm logical volume is just another disk.
</I>><i>
</I>><i> I've had issues in the past because Linux considered LVM just one logical
</I>><i> disk and I think the average user would eventually have the same problem as
</I>><i> well. I think moving to LVM as the default will create too many complaints
</I>><i> and support requests in the end.
</I>><i>
</I>><i> A long time ago I had a system with 6 SCSI disks, each 1.2GB. The system
</I>><i> was fairly useless with the single disks, but using LVM I had 1 disk of
</I>><i> reasonable size. I ran the system for about a year with no problems, but
</I>><i> then 1 of the disks failed. Normally this would be a medium inconvenience,
</I>><i> because I would just have to restore the files from that one drive to
</I>><i> another drive. However, with the LVM,
</I>
... or RAID0 ...
><i> I lost the ability to read the entire
</I>><i> LVM.
</I>
VG.
><i> I had to restore the entire system, which was a much bigger pain. I
</I>><i> also could not obtain a disk of the same small size for a reasonable price,
</I>><i> which I was told would make the problem even bigger.
</I>
Irrelevant for LVM. Only partly relevant for RAID0.
><i> If I had used some redundancy, then I might have been able to restore the
</I>><i> one disk, but I was a novice user and didn't understand the need. I think
</I>><i> that most users who use the defaults and probably novice users, or at least
</I>><i> will be after Mageia takes off. I think LVM support is a must, but I think
</I>><i> making it the default, without also making some redundancy the default,
</I>><i> will cause more problems than it solves.
</I>
For single-disk systems, there is no difference.
For multi-disk systems, whether it would have been any different depends on
whether you had a single VG or multiple VGs.
But, by the time you talk about 6 disks, we're not talking about a default
anymore.
Regards,
Buchan
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