Re: [BackupPC-users] Backup Data Transfer Speed

[Gary R. <gar...@ve...>]

On 04/08/2013 10:03 AM, Les Mikesell wrote:
> On Mon, Apr 8, 2013 at 11:02 AM, Gary Roach<gar...@ve...>  wrote:
>
>>>       Above, do you really mean that I could expect transfer rates as low
>> as 600 to 800 KB/S. I could carry the data in a bucket faster. I don't
>> have a real good figure for the transfer rates for my present setup but
>> know they are way faster than that.
>>
>> I am getting the idea that putting in a GigE system isn't going to buy
>> much speed. Any comments?
> Your bottleneck is really going to be the seek time on those older
> disk drives, and the smaller the files the more trips the heads have
> to make to the diretory/inode/data.   Adding RAM can help some by
> letting you cache more of the directory/inodes.   With rsync, after
> the initial full run, the network speed won't matter that much.
> You'll still spend a lot of time reading and computing the checksums
> for verification at both ends but only the differences are
> transferred.   If you use the --checksum-seed option, after the 2nd
> full copy of any file the server will used the cached copies instead
> of having to uncompress its copy to recompute them.
>
> --
>      Les Mikesell
>       les...@gm...
>
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Thank you all for your comments. I think I'll scrap the GigE network, 
use the checksum caching suggestion an load up on RAM. The Green drive 
is already purchased. This is pretty light load system so I will use it 
until it fails. Unless I loose it and my client computer at the same 
time i'll still be OK. Southern California isn't noted for its thunder 
storms so I should be OK. Right now I am using an old IBM drive of the 
type that put them out of the drive business. You can fry eggs on the 
motor housing. It's been cooking (no pun intended) along for a couple of 
years with no problems. The green drive has to be an improvement on that.

Gary R