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

From: Patrik Dufresne
Subject: Re: [rdiff-backup-users] Backup freezing destination computer
Date: Fri, 14 Jun 2019 14:43:31 -0400

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/>/
130 rue Doris
St-Colomban, QC J5K 1T9

On Fri, Jun 14, 2019 at 2:32 PM Robert Farrington <address@hidden>

> 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
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