Linux on PE2950, PV220S and very slow PV124T

David B. haazeloud at gmail.com
Mon Sep 1 08:42:35 CDT 2008


Hi,

I've made some new tests.

Transfert of 380 GB of data (17 000 files) from PE hard drives to PV124T 
: 2 hours, so 190 GB / hour.
Transfert of 360 GB of data (44 000 files) from PE hard drives to PV124T 
(différent tape) : 2 hours, so 180 GB / hour.

So copy bigs files from hard drive to tape is good.

Copy from memory to tape is good too :
# time dd if=/dev/zero of=/dev/nst0 bs=1M count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 8.94961 seconds, 117 MB/s

real    0m8.954s
user    0m0.001s
sys     0m0.363s

But, transfert of 300 GB of data (lots of files, around 12 000 000) from 
PV220S (not PE hard drives) to PV124T is slow : between 20 to 22 hours, 
so 15 GB / hour.

I think PV220S could be a problem or something between PV220S and PV124T 
doesn't like lots of files.

I/O Sheculer for all hard drives (PV220S and PE hard drives) is [CFQ].

Any idea ?

Thank you
David.



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