On Mon, 31 Oct 2005, Tracy R Reed wrote:
New datapoint: I am now backing up to my recently acquired USB2 hard
drive using file storage and the backup speeds are very slow just like
with DVD. So it can't be disk bandwidth or DVD issues. Still have 95%
idle cpu time during backup.
What happens if you just do block copies to the USB disk?
We've found here that USB2 is quite slow for filestorage on linux systems
but I haven't had time to investigate why.
Tracy R Reed wrote:
Ok, so over the course of the last few days I think I have got just
about everything figured out. I have a full backup of all three of my
systems safely on DVD, I can restore, it does incrementals automatically
every night, I am happy.
Except for one thing: The backups are VERY slow. Even the host local to
the DVD burner is very slow so it cannot be the network even though I
have tested that and it is very fast. It seems to run somewhere between
100k/s and 1M/s. I do not know why it varies. It seems like perhaps it
gets faster as the backup progresses, I'm not sure. At first I thought
maybe I was somehow running out of disk bandwidth or causing disk
contention since I am backing up from and spooling DVD images to the
same spindle. But I ran some disk benchmarks and watched iostat and
while the backup is running I can get 50MB/s disk throughput. Plus it's
slow when streaming from other hosts and spooling locally. Also, the cpu
time is 95% idle during the backup so it isn't cpu contention. So it
would seem that the delay must be coming from somewhere within bacula
itself. A full backup of my system should take just a couple of hours,
not 12!
I am running bacula from CVS as of three or four days ago on an AMD64
running FC4.
Any ideas? Thanks!
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