> -----Original Message-----
> From: Les Mikesell [mailto:lesmikesell AT gmail DOT com]
> Sent: Thursday, December 23, 2010 12:10 AM
> To: backuppc-users AT lists.sourceforge DOT net
> Subject: Re: [BackupPC-users] very slow backups
>
> On 12/22/10 11:53 PM, Chris Baker wrote:
> > I had to upgrade my backup drive. I went from 2 1TB drives in a RAID 0
> > array to 2 2TB drives in a RAID 0 array. With the old drives and
> > enclosure, my performance was about 4-5 MB per second. With the new
> > drives, my performance is about 1.5 MB per second. This is terrible
for
> a
> > backup of any significance.
> >
> > Does anyone have any suggestions on why my bandwidth has gotten
slower?
> > Everything else is same as before.
>
>
> Do the 2TB drives use 4K sectors?  Those need a fairly recent kernel and
> special
> partition alignment to avoid having to read and rewrite partially filled
> sectors.
>
> --
>    Les Mikesell

Thank you for your response. I'm not sure what sector size my hard drives
use. I do know that they are Western Digital Caviar Green drives with a 64
MB buffer. They are 7200 rpm.

I know that partitions over 2048 GB have to be set up differently. If
there is something else I need to do, I will do it. Partition is ext3.

I'm thinking a lot about the need to upgrade this system. I haven't done
much of anything with it since we got it back in 2008. BackupPC was such a
bear to set up that I wasn't sure that I wanted to take that plunge again.
My attitude has been don't upgrade unless you must.

I remember doing a kernel upgrade and losing access to a drive. I didn't
try it again.

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