On Tue, Oct 01, 2002 at 04:11:16AM +0000, Christensen Tom wrote:
>
> I am wondering about hard drive performance with large files.
> namely large video files/video editing.
> I have 2 120GB hard drives, I want them to appear as 1 volume,
> performance wise would RAID or lvm be better?
> if RAID which level 0-5??
Given that you have only 2 drives, you've only got 2 choices: RAID 0
(Striping) or RAID 1 (Mirroring).
No matter what, put each drive on a dedicated IDE channel for best
performance.
RAID 0 will stripe the data across both drives. A single drive failure
will cost you the data on both drives.
RAID 1 will mirror the data and allow you to have access to your data in
the event of a single drive failure.
There are *MANY* implementations of RAID 1, in both hardware and
software. You'll need to look at the specific implementation details to
see which is best for you. Some implementations will always read from
one member until the member fails, at which point they'll read from the
other member (in all cases, writes have to be done to both members).
Some implementations round-robin between members, and some look at the
response time of each member to see which drive can return the data the
fastest. Don't forget that the members don't have to be identical.
Nothing prevents you from doing a software mirror of a 5400rpm IDE drive
with a 15Krpm SCSI drive.
There are tradeoffs involved. You may want to look at IDE RAID cards
(Promise and Highpoint come to mind) or you may to look at a pure
software solution. You may need to benchmark the solutions - there is
no guarantee that a hardware solution is faster than a software solution
- this may depend on the speed and load of your system and the price and
specs of the hardware controller.
Cheers,
.../Ed
--
Ed Wilts, Mounds View, MN, USA
mailto:[EMAIL PROTECTED]
Member #1, Red Hat Community Ambassador Program
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