On Mon, Sep 17, 2012 at 06:05:28PM +0000, John Rouillard wrote:
> On Mon, Sep 17, 2012 at 12:54:35PM -0400, Timothy J Massey wrote:
> > No matter the size of the system, I seem to top out at about 50GB/hour for 
> > full backups.  Here is a perfectly typical example:
> > 
> > Full Backup:  769.3 minutes for 675677.3MB of data.  That works out to be 
> > 878MB/min, or about 15MB/s.  For a system with an array that can move 
> > 200MB/s, and a network system that can move at least 70MB/s.
> 
> My last full backup of a 2559463.2 MB backup ran 306.9 minutes. Which
> if I am doing my math right is 138MB/s. This was overlapping in i/o
> with 9 other backups in various backup stages.

I have another system that is lower power:

  2632652.8 MB at 662.5 minutes or 66MB/s

the BackupPC system is a 4 core system with Dual-Core AMD Opteron(tm)
Processor 2216 (2412.400 MHz). 16GB of memory with 4x1TB disks. Raid 5
running 3ware raid card with BBU cache. For the majority of the time
that backup runs, there are only 3 or so other jobs runing at the same
time.

> But I had much the
> same numbers running on a 4 core, 32 GB (or maybe 16) machine with an
> attached SCSI disk array raid 6 with 14 or 15 spindles (Dell
> MD1000). Disk is isci using ext4 noatime.

If this memory is true (the system is offline at the moment so I can't
check) then the amount of memory on the system may play a role.

-- 
                                -- rouilj

John Rouillard       System Administrator
Renesys Corporation  603-244-9084 (cell)  603-643-9300 x 111

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