Re: ANNOUNCE: mdadm 1.8.0 - A tool for managing Soft RAID under Linux

On Wednesday November 3, AndyLiebman@aol.com wrote:

quoted

neilb@cse.unsw.edu.au writes:

Hmmm... I might work with 1.6 if you --build that raid0 (rather than
--create),  or if you are using a 64bit processor like alpha or ia64. 
But mdadm 1.6 definitely have problems in i386 processors when you try
to --create a raid0 with devices larger than 2 terabytes.

I have been using "mdadm -Cv /dev/md0 -n2 -l0 -c[256 or 512] /dev/sd{a,b}" 
without incident. But I'll switch over to 1.8. 

Very odd.  Is this on a 2.4 or a 2.6 linux kernel??

Was the previous problem only one of creating the arrays? Or could there be 
further problems down the line with my arrays that were created with
1.6? 

If your arrays were successfully created and appear to be working,
they should be fine and should continue to work.

NeilBrown

By the way, do you know anybody with enough understanding of the Linux kernel 
to be able to rationally and logically tune the following items, which all 
relate to one another and MUST have some optimum settings for low-latency/high 
throughput over a network. 

* chunk size/stripe size of Hardware and Software arrays
* blockdev --setra (for each Hardware array)
* blockdev --setra (for each Linux Software array on top of Hardware)
* tcp items in /proc/sys/net/core and /proc/sys/net/ipv4 like rmem_max, 
wmem_max and the like

Regards, 
Andy Liebman