Jeff V. Merkey wrote:
Jens Axboe wrote:
On Mon, Jan 16 2006, Jeff V. Merkey wrote:
Max Waterman wrote:
I've noticed that I consistently get better (read) numbers from kernel
2.6.8 than from later kernels.
To open the bottlenecks, the following works well. Jens will shoot me
-#define
Use either for raid0 (I don't think dm has particular advantages
for md or md over dm).
I measured this a few months ago, and was surprised to find that
DM raid0 was very noticably slower than MD raid0. same machine,
same disks/controller/kernel/settings/stripe-size. I didn't try
to
On 2006-01-19T21:12:02, Jan Engelhardt [EMAIL PROTECTED] wrote:
Use md for raid1, raid5, raid6 - anything with redundancy.
Use dm for multipath, crypto, linear, LVM, snapshot
There are pairs of files that look like they would do the same thing:
raid1.c - dm-raid1.c
linear.c -
PFC wrote:
When rebuilding md1, it does not realize accesses to md0 wait for
the same disks. Thus reconstruction of md1 runs happily at full speed,
and the machine is dog slow, because the OS and everything is on md0.
(I cat /dev/zero to a file on md1 to slow the rebuild so it
What kernel are you using?
NeilBrown
Kernel version : 2.6.15-gentoo
Yes, it's strange... Not very annoying, as the rebuild is finished already
(at 40 MB/s it was short), but strange.
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On Thursday January 19, [EMAIL PROTECTED] wrote:
I'm currently of the opinion that dm needs a raid5 and raid6 module
added, then the user land lvm tools fixed to use them, and then you
could use dm instead of md. The benefit being that dm pushes things
like volume autodetection and
I'm currently of the opinion that dm needs a raid5 and raid6 module
added, then the user land lvm tools fixed to use them, and then you
could use dm instead of md. The benefit being that dm pushes things
like volume autodetection and management out of the kernel to user space
where it
Neil Brown wrote:
The in-kernel autodetection in md is purely legacy support as far as I
am concerned. md does volume detection in user space via 'mdadm'.
What other things like were you thinking of.
Oh, I suppose that's true. Well, another thing is your new mods to
support on the fly
On Thursday January 19, [EMAIL PROTECTED] wrote:
Neil Brown wrote:
The in-kernel autodetection in md is purely legacy support as far as I
am concerned. md does volume detection in user space via 'mdadm'.
What other things like were you thinking of.
Oh, I suppose that's true.
Neil Brown wrote:
Maybe the problem here is thinking of md and dm as different things.
Try just not thinking of them at all.
Think about it like this:
The linux kernel support lvm
The linux kernel support multipath
The linux kernel support snapshots
The linux kernel support raid0
The
On 20/01/2006 11:32 a.m., Neil Brown wrote:
On Thursday January 19, [EMAIL PROTECTED] wrote:
I'm currently of the opinion that dm needs a raid5 and raid6 module
added, then the user land lvm tools fixed to use them, and then you
could use dm instead of md. The benefit being that dm pushes
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