hvjunk at gmail.com
Wed Jan 4 02:46:44 MST 2012
On Tue, Jan 3, 2012 at 3:42 PM, R. Pietsch <rp.rsync at pcs-at.com> wrote:
> 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
> 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://email@example.com/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?
You do have jumbo frames enabled on both servers and the network
equipment in between?
Do check the TCP/IP stack parameters, as most bandwidth testing is
done with UDP.
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