Re: [rdiff-backup-users] Backup freezing destination computer

[Chris Wilson]

It's also possible that rdiff-backup on the server is using too much memory
(or space on /tmp, if that's a ramdisk), causing the system to swap to
death. You could run vmstat on the server during the backup, and when it
freezes, look at the recent statistics (the last few lines before it froze).

Thanks, Chris.

On Fri, 14 Jun 2019 at 20:18, Patrik Dufresne <address@hidden>
wrote:

> I would really continue digging into the IO performance. The CPU should not
> reach 100% during a backup, it's supposed to mostly wait for the disk IO.
> Most likely, your CPU is doing some extra work that should not take place.
>
> You may also take a look at `iostat` to see if the disk are busy. You may
> also run a benchmark on this system. In the past, I used "phoronix test
> suite" which provide multiple test. In my case, one of the test never
> complete and server died.
>
> --
> Patrik Dufresne Service Logiciel inc.
> http://www.patrikdufresne.com <http://patrikdufresne.com/>/
> 514-971-6442
> 130 rue Doris
> St-Colomban, QC J5K 1T9
>
>
> On Fri, Jun 14, 2019 at 2:32 PM Robert Farrington <address@hidden>
> wrote:
>
> > Thanks for your response.  I don't think it's a hardware problem, but
> > here's our hardware setup:
> >
> > Pentium 4 3GHz
> > 2 1TB Western Digital hard drives in Raid-1 config, SATA-2 interface
> > It looks like we are using XFS and LVM.
> >
> > I know it's an old cpu, but the disks have been replaced recently.
> >
> > I can't usually look at the load average when the system freezes because
> I
> > can't do anything. But I have seen the CPU used 100% during a backup.
> >
> > Bob
> > On Wednesday, June 12, 2019, 8:00:03 PM PDT, Patrik Dufresne <
> > address@hidden> wrote:
> >
> >
> > It's probably not directly related to rdiff-backup but the high volume of
> > IO on the server. If you have a monitoring system, could you take a look
> at
> > loadaverage ? It's probably going up when the backup is running. It's
> > telling you the IO of the server is probably not capable enough. It might
> > be related to various factor. Could you provide more technical details
> > regarding your setup ? Hardware, RAID config, SATA or SAS, FileSystem,
> > ext4, LVM ?
> >
> > As an example. On one of our server, an LXC on Proxmox, running on ZFS, I
> > remeber I needed to disable a kernel feature related to huge memory page.
> > Otherwise, the container would died without apparent reason.
> >
> > --
> > Patrik Dufresne Service Logiciel inc.
> > http://www.patrikdufresne.com <http://patrikdufresne.com/>/
> > 514-971-6442
> > 130 rue Doris
> > St-Colomban, QC J5K 1T9
> >
> >
> > On Wed, Jun 12, 2019 at 8:49 PM Robert Farrington <address@hidden
> >
> > wrote:
> >
> > I am using rdiff-backup 1.2.8 on Centos 7, backing up a remote Centos 7
> > computer.  It occasionally freezes up the destination computer, and I
> can't
> > log in or ssh in to see what's wrong.  If I leave it logged in and it
> > freezes, I still can't do anything to find out what's wrong.  I have to
> > power cycle to get it back.  Any suggestions on how to fix this?Bob
> >
> > _______________________________________________
> > rdiff-backup-users mailing list at address@hidden
> > https://lists.nongnu.org/mailman/listinfo/rdiff-backup-users
> > Wiki URL:
> > http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki
> >
> >
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