cp command slow after install new kernel.

[klemerS]

Hi.

I got dl380 connected to eva5000. each day
i copy data from mt ocfs filesystem to ext3:
cp -r --o_direct ...

The cp takes about 30 min for 50gb. After I
update my kernel from 2.4.21-27 to 2.4.21-37
its take 90min thae same copy.

even regular "cp" tkae twice the time.

I checked few times by reloading the kernels
to insure that i dont make any mistake?

its very strange!!

Any Idea?????

Thanks.

[Eric Singer]

Have you reloaded the most current modules for the HBA(s)? When you change kernels the modules that came with the kernel will be loaded which are normally not very current.

[Alan_152]

check your hba drivers, and make sure that your setup on the eva is optimized and not opening extra ports (a problem I'm having right now is that for every LUN I set up on the eva, it creates 4 /dev/sd? devices on my box -- apparently this is a known problem).

[klemerS]

Thanks for your replays!

I will check the HBA driver.

I dont think that the eva ports is A problem

since the cp command work well with kernel

2.4.21-27

Meanwhile i am working with the old kernel.

Shalom.

[Erez Kirson]

Hi,

I would recommend using "tar" for large copies.
you will see a major preformence improvement

Erez

[klemerS]

Hi.

About tar... Can i use tar to copy files

from ocfs filesystem to ext3 ????

with cp i use the --o_direct option.


Shalom.

[Vitaly Karasik_1]

It may be some problem with a LBA and/or NIC drivers.
Try to load *old* kernel and check which LBA/NIC drivers it uses.

Rgds,
Vitaly

[Vitaly Karasik_1]

BTW, don't forget about assigning points!
(0 points for answers to 27 questions isn't too much... )

[Alan_152]

http://amath.colorado.edu/computing/software/man/tar.html

Speicifically,

Create an archive (bundle together a bunch of files+directories into a single file):

tar cvf archivefile.tar file1 file2 subdir1 subdir2

[klemerS]

Hi.

I did not have the chance to check the problem yet.

but i think that i will install test machine
with RHES 3.0 U6 & see if i get the same
symptoms.

Shalom.

[klemerS]

Hi Alan.

i download the tar rpm which support
the direct_io & i will check this too.

Thanks.

[Alan_152]

You really shouldn't need to downloan any rpms for tar, as tar is native to just about every *nix version every made (or at least since 1970).