Chunk Size

[Rolf Schatzmann <rolf@mactherapy.com>]

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Hi,

I have been using Linux Software Raid 5 for years, it is excellent. If 
anyone involved in the development of it is ever in Perth Australia look 
me up and i will buy you many beers.
Last year i switched from using pata to sata, to be honest it did not 
result in the performance gains I was hoping for and when a drive fails 
it sometimes crashes the host machine (at least with a 2.4 kernel) but 
otherwise its just as dependable as pata raid 5 was. I used to just use 
raid for the data volume of the server but recently i am using it for / 
with a separate raid 1 partition for /boot , it works very well.

In the past I have had to do a few crazy things with raidreconf and got 
away with most of them, however that was when i was using raidtools2 and 
now its all mdadm instead, so my question is this, is there anyway to 
change the chunk size on an existing raid 5 partition without destroying 
the data on it and whilst it is mounted at / .  Yeah you read that 
right, I am laughing too, but I just wanted to be sure i am not missing 
something obvious here, I have in the past found huge performance gains 
by using larger chunk sizes for big file copies and would like to 
experiment.

Thanks in advance!

-- 
--------------------------

Rolf Schatzmann
MacTherapy Australia Pty Ltd
Fax 08 9444 2560
Mobile 0410 577664

We love GNU/Linux Debian.

Http://www.mactherapy.com


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