>>>>> "Simon" == Simon Matter <simon.matter@xxxxxxxxxxxxxxxx> writes:
Simon> Martin Spott schrieb:
>>
>> > I have a 8 disk RAID 5 partition (8 X 9 GB) on a split bus Compaq
>> > array [...]
>>
>> Just to be curious (as always ....): Do you use the old 'md' driver
>> for this or LVM ? Should I stay away from one of these (despite the
>> issues with internal log on RAID5) ?
Simon> IIRC you can not use LVM to create RAID5 devices, just
Simon> RAID0,1.
Correct. MD and LVM are orthogonal.
Think of MD as a way to improve redundancy and/or performance. And
LVM as a dynamic partitioning scheme.
Forget about the striping features of LVM. MD RAID0 is a lot faster.
Simon> Anyway it seems to be not so sure that we always have a working
Simon> LVM for every kernel (Isn't it broken at this time for
Simon> 2.5?). MD should be more safe here.
And yet neither LVM nor MD are big I/O safe in 2.5 yet.
--
Martin K. Petersen, Principal Linux Consultant, Linuxcare, Inc.
mkp@xxxxxxxxxxxxx, http://www.linuxcare.com/
SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/
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