Keld Jørn Simonsen wrote:
On Mon, Jan 28, 2008 at 07:13:30AM +1100, Neil Brown wrote:
On Sunday January 27, keld@xxxxxxxx wrote:
Hi
I have tried to make a striping raid out of my new 4 x 1 TB
SATA-2 disks. I tried raid10,f2 in several ways:
1: md0 = raid10,f2 of sda1+sdb1, md1= raid10,f2 of sdc1+sdd1, md2 = raid0
of md0+md1
2: md0 = raid0 of sda1+sdb1, md1= raid0 of sdc1+sdd1, md2 = raid01,f2
of md0+md1
3: md0 = raid10,f2 of sda1+sdb1, md1= raid10,f2 of sdc1+sdd1, chunksize of
md0 =md1 =128 KB, md2 = raid0 of md0+md1 chunksize = 256 KB
4: md0 = raid0 of sda1+sdb1, md1= raid0 of sdc1+sdd1, chunksize
of md0 = md1 = 128 KB, md2 = raid01,f2 of md0+md1 chunksize = 256 KB
5: md0= raid10,f4 of sda1+sdb1+sdc1+sdd1
Try
6: md0 = raid10,f2 of sda1+sdb1+sdc1+sdd1
That I already tried, (and I wrongly stated that I used f4 in stead of
f2). I had two times a thruput of about 300 MB/s but since then I could
not reproduce the behaviour. Are there errors on this that has been
corrected in newer kernels?
Also try raid10,o2 with a largeish chunksize (256KB is probably big
enough).
I tried that too, but my mdadm did not allow me to use the o flag.
My kernel is 2.6.12 and mdadm is v1.12.0 - 14 June 2005.
can I upgrade the mdadm alone to a newer version, and then which is
recommendable?
I doubt that updating the mdadm is going to help, the kernel is old and
lacks a number of improvements in the last few years. I don't think you
will see any major improvements without a kernel upgrade.
--
Bill Davidsen <davidsen@xxxxxxx>
"Woe unto the statesman who makes war without a reason that will still
be valid when the war is over..." Otto von Bismark
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