As far as I can see timestamp and size is the default. I've turned off compression and I think I'm getting better throughput. Running 4 rsync tasks and getting sustained transfers for several hours of just over 800Mb/sec :- ) --Russell -----Original Message----- From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of John R Pierce Sent: Tuesday, 31 July 2012 5:16 p.m. To: centos at centos.org Subject: Re: [CentOS] rsync question On 07/30/12 10:05 PM, Smithies, Russell wrote: > I'm trying to rsync a 8TB data folder containing squillions of small files and it's taking forever (i.e. weeks) to get anywhere. > I'm assuming the slow bit is check-summing everything with a single > CPU (even though it's on a 12-core server ;-( ) Is it possible to do something simple like scp the whole dir in one go so they're duplicates in the first instance, then get rsync to just keep them in sync without an initial transfer? use the rsync mode that goes off file timestamp and size. the checksuming block algorithm is only useful on large files that get small random block changes. -- john r pierce N 37, W 122 santa cruz ca mid-left coast _______________________________________________ CentOS mailing list CentOS at centos.org http://lists.centos.org/mailman/listinfo/centos ======================================================================= Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. =======================================================================