On Tue, Jan 30, 2018 at 10:00:44AM +0100, Reindl Harald wrote: > Am 30.01.2018 um 09:49 schrieb Terry Barnaby: > > Untar on server to its local disk: 13 seconds, effective data rate: 68 > > MBytes/s > > > > Untar on server over NFSv4.2 with async on server: 3 minutes, effective > > data rate: 4.9 MBytes/sec > > > > Untar on server over NFSv4.2 without async on server: 2 hours 12 > > minutes, effective data rate: 115 kBytes/s !! > > > > Is it really expected for NFS to be this bad these days with a > > reasonably typical operation and are there no other tuning parameters > > that can help ? > > no, we are running a virtual backup appliance (VMware Data Protection aka > EMC Avamar) on vSphere 5.5 on a HP microserver running CentOS7 with a RAID10 > built of 4x4 TB consumer desktop disks and the limiting factor currently is > the Gigabit Ethernet > > 35 TB network IO per month, around 1 TB per day which happens between 1:00 > AM and 2:00 AM as well as garbage collection between 07:AM and 08:00 AM Again, this is highly dependent on the workload. Your backup appliance is probably mainly doing large sequential writes to a small number of big files, and we aim for that sort of workload to be limited only by available bandwidth, which is what you're seeing. If you have a single-threaded process creating lots of small files, you'll be limited by disk write latency long before you hit any bandwidth limits. --b. _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
