Re: [BackupPC-users] maximum clients/data
2008-11-26 14:16:52
tmassey AT obscorp DOT com wrote at about 09:07:04 -0500 on Wednesday, November
26, 2008:
> Tino Schwarze <backuppc.lists AT tisc DOT de> wrote on 11/26/2008 01:24:47
> PM:
>
> > > > Have you looked at the wait column (last one) in vmstat?
> > >
> > > As in iowait? Usually the CPU is "100%" used, but much of it is
> iowait
> > > (~40-60%, IIRC). Of course, you *expect* that: I'm I/O bound, after
> all,
> > > with only a single IDE hard drive... Also, I'm not using compression,
>
> > > which is also why I'm not worried about CPU.
> >
> > In my version of vmstat, iowait is not accounted to CPU usage (SuSE
> > 10.2).
>
> You are right: I think it's the same on mine (CentOS 5.2). I'm thinking
> of top, where the total CPU is shown as 100%.
>
> But the point holds: I have lots of unused CPU, even with an *anemic*
> EPIA @ 1.2GHz.
>
>
> I'm still not sure why people say they need multi-GB of RAM and multi-GHz
> CPU's for their BackupPC servers. I *just* don't see why: I've got a
> pool >600GB on a *tiny* box (without compression, anyway). Maybe if
> you've got >1TB of pool data or multi-millions of files you *might* need a
> little more RAM (and I don't think that is the case), but I *still* don't
> see why you'd need more than 1GB of RAM, and still no more CPU power.
> Again, you need a many-drive RAID array *way* more than you do need CPU or
> RAM.
>
> Maybe I'm the only person who's running BackupPC on a box this small. But
> I've got about a *dozen* of these boxes scattered around various clients,
> backing up between 10 and 600GB of data. They *all* run flawlessly.
>
Well, there are definitely people running BackupPC on smaller
systems...
A number of people are running BackupPC on small embedded systems like
the d-link DNS-323 NAS device.
That device has only 64MB of RAM of which 16MB is used as a ramdisk!
It uses an arm processor running at about 400-500MHz and I don't think
it even has a floating point processor.
Now at that level, I have found that memory makes a difference when I
try to rsync the pool since rsync compiles a list of all the hard link
inodes and that takes up (some) memory...
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- [BackupPC-users] maximum clients/data, chantal
- Re: [BackupPC-users] maximum clients/data, Rob Owens
- Re: [BackupPC-users] maximum clients/data, Tino Schwarze
- Re: [BackupPC-users] maximum clients/data, tmassey
- Re: [BackupPC-users] maximum clients/data, Tino Schwarze
- Re: [BackupPC-users] maximum clients/data, tmassey
- Re: [BackupPC-users] maximum clients/data, Tino Schwarze
- Re: [BackupPC-users] maximum clients/data, tmassey
- Re: [BackupPC-users] maximum clients/data, Tino Schwarze
- Re: [BackupPC-users] maximum clients/data,
Jeffrey J. Kosowsky <=
- Re: [BackupPC-users] maximum clients/data, tmassey
- Re: [BackupPC-users] maximum clients/data, Jeffrey J. Kosowsky
- Re: [BackupPC-users] maximum clients/data, chantal
- Re: [BackupPC-users] maximum clients/data, Ski Kacoroski
- Re: [BackupPC-users] maximum clients/data, tmassey
- Re: [BackupPC-users] maximum clients/data, dan
- Re: [BackupPC-users] maximum clients/data, Thomas von Eyben
- Re: [BackupPC-users] maximum clients/data, Jeffrey J. Kosowsky
- Re: [BackupPC-users] maximum clients/data, Ski Kacoroski
- Re: [BackupPC-users] maximum clients/data, Ryan Manikowski
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