Linux on PE2950, PV220S and very slow PV124T

Patrick_Fischer at Dell.com Patrick_Fischer at Dell.com
Tue Sep 2 02:58:26 CDT 2008


Hi,

Did you test the performance of the 220 with a tool like iometer. Results?
Is it the same Server where you test from the internal disks and the Storage Enc. Or did we have Switches and Network between it?
Configured VD's in the PV? Cache Settings of the VD's? (Read Policy at least?)

-----Original Message-----
From: linux-poweredge-bounces at dell.com [mailto:linux-poweredge-bounces at dell.com] On Behalf Of David B.
Sent: Monday, September 01, 2008 3:43 PM
To: linux-poweredge-Lists
Subject: Re: Linux on PE2950, PV220S and very slow PV124T

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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