Low performance

[R. Pietsch]

Hi!

I do a rsync between 2 machines. The throughput is only 2 MByte/Sec.

Each machine is a Supermicro server with
    2 x 8 Core Opteron 6128
    64 GByte of ECC RAM
    1 LSI MegaRAID SAS 9280-24i4e
    24 x 2TByte SATA Disks as a RAID6
    2 Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network-cards

Both run Ubuntu 11.04 64Bit.
Both use rsync version 3.0.7  protocol version 30

There are no errors reported.
The local read and write rate to the disks is 1,1 GB/s.
A network test shows 800MByte/s over the direct coupled network-cards.
The CPU-usage is  5 to 7% of one core.
Memory-usage is 1703 out of 64557MB.
There are no other jobs running on the two machines.
The LSI controllers both say: State: Optimal


machine A has a rsync-daemon with the following configuration:
----------
read only = false
use chroot = false
hosts allow = 10.99.11.0/24
[Daten1]
        path = /var/daten1
        use chroot = yes
        read only = yes
        list = yes
        uid = root
        gid = root
        strict modes = yes
        ignore errors = no
        ignore nonreadable = yes
        transfer logging = no
        timeout = 600
        refuse options = checksum dry-run
        dont compress = *
----------

machine B runs:

/usr/bin/rsync -ax --numeric-ids --delete --delete-excluded \
    --exclude-from=/Backup/RB_None.excl \
    --link-dest=/Backup/Base/xxxxx \
    rsync://root@10.99.11.11/Daten1/ \
    /Backup/Base/yyyyyyy \
    --no-c --no-z

The files are all about 8 MB in size.

    8302592 100%    1.98MB/s    0:00:04 (xfer#861, to-check=51173/94679)

The same - slow - transfer happens at 1GB and 5GB files.


Any ideas what can cause this slow transmission?


-- 
Mit freundlichen Grüßen / best regards

Ing. Rainer Pietsch
----------------------------------------------------------
PCS - Pichler Computer Systeme
Inh. Claudia Pichler-Pietsch
Hauptplatz 10
A-2751 Steinabrückl
Österreich / Austria
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mail:  r.pietsch at pcs-at.com
web:   http://www.pcs-at.com
tel.:  +43 (2622) 420 19 / 15
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