On Tue, Jan 3, 2012 at 3:42 PM, R. Pietsch <rp.rs...@pcs-at.com> wrote: > > 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?
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. -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
