[EMAIL PROTECTED] wrote at about 09:07:04 -0500 on Wednesday, November 26, 2008: > Tino Schwarze <[EMAIL PROTECTED]> 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... ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
