Problems on ADSL link and large directory

[Sam Przyswa]

Hi,

We have problems to backup a large /home directory (+/- 12Go) with rsync 
(daemon mode) and BackupPC on ADSL static IP 4Mbps/380Kbps for the 
backed-up machine and Internet 10Mbps for the backup server, the rsync 
options are:

            '--numeric-ids',
            '--perms',
            '--owner',
            '--group',
            '--devices',
            '--links',
            '--times',
            '--block-size=2048',
            '--recursive',

We have not noticed any link failure on ADSL, on the backed-up machine 
the rsync.log we have:

2006/01/17 17:23:43 [12651] rsync: writefd_unbuffered failed to write 
4096 bytes: phase "unknown" [sender]: Connection timed out (110)
2006/01/17 17:23:43 [12651] rsync error: error in rsync protocol data 
stream (code 12) at io.c(1099)

And on our backup server we got this on tcpdump:

18:13:20.208260 IP our.backup.server.com.57877 > the.remote.server.com.rsync: . ack 281801068 win 32768 <nop,nop,timestamp 1130933733 1385607516,nop,nop,sack 3 {281822788:281824236}{281861884:281867804}{281857540:281858988}>
18:13:20.246229 IP the.remote.server.com.rsync > our.backup.server.com.57877: . ack 47785 win 0 <nop,nop,timestamp 1385665768 1130352553>
18:13:43.028566 IP the.remote.server.com.rsync > our.backup.server.com.57877: . 281801068:281802516(1448) ack 47785 win 0 <nop,nop,timestamp 1385668045 1130352553>
18:15:20.226961 IP our.backup.server.com.57877 > the.remote.server.com.rsync: . ack 281801068 win 32768 <nop,nop,timestamp 1131053771 1385607516,nop,nop,sack 3 {281822788:281824236}{281861884:281867804}{281857540:281858988}>
18:15:20.264772 IP the.remote.server.com.rsync > our.backup.server.com.57877: . ack 47785 win 0 <nop,nop,timestamp 1385677767 1130352553>
18:15:43.055755 IP the.remote.server.com.rsync > our.backup.server.com.57877: . 281801068:281802516(1448) ack 47785 win 0 <nop,nop,timestamp 1385680045 1130352553>
18:17:20.245954 IP our.backup.server.com.57877 > the.remote.server.com.rsync: . ack 281801068 win 32768 <nop,nop,timestamp 1131173809 1385607516,nop,nop,sack 3 {281822788:281824236}{281861884:281867804}{281857540:281858988}>
18:17:20.283561 IP the.remote.server.com.rsync > our.backup.server.com.57877: . ack 47785 win 0 <nop,nop,timestamp 1385689767 1130352553>
18:17:43.082700 IP the.remote.server.com.rsync > our.backup.server.com.57877: . 281801068:281802516(1448) ack 47785 win 0 <nop,nop,timestamp 1385692045 1130352553>
18:19:20.264303 IP our.backup.server.com.57877 > the.remote.server.com.rsync: . ack 281801068 win 32768 <nop,nop,timestamp 1131293847 1385607516,nop,nop,sack 3 {281822788:281824236}{281861884:281867804}{281857540:281858988}>
18:19:20.302149 IP the.remote.server.com.rsync > our.backup.server.com.57877: . ack 47785 win 0 <nop,nop,timestamp 1385701766 1130352553>
18:19:43.110385 IP the.remote.server.com.rsync > our.backup.server.com.57877: . 281801068:281802516(1448) ack 47785 win 0 <nop,nop,timestamp 1385704045 1130352553>
18:21:20.283447 IP our.backup.server.com.57877 > the.remote.server.com.rsync: . ack 281801068 win 32768 <nop,nop,timestamp 1131413885 1385607516,nop,nop,sack 3 {281822788:281824236}{281861884:281867804}{281857540:281858988}>
18:21:20.320952 IP the.remote.server.com.rsync > our.backup.server.com.57877: . ack 47785 win 0 <nop,nop,timestamp 1385713765 1130352553>
18:21:43.137332 IP the.remote.server.com.rsync > our.backup.server.com.57877: . 281801068:281802516(1448) ack 47785 win 0 <nop,nop,timestamp 1385716045 1130352553>
18:23:20.302265 IP our.backup.server.com.57877 > the.remote.server.com.rsync: . ack 281801068 win 32768 <nop,nop,timestamp 1131533923 1385607516,nop,nop,sack 3 {281822788:281824236}{281861884:281867804}{281857540:281858988}>
18:23:20.339520 IP the.remote.server.com.rsync > our.backup.server.com.57877: . ack 47785 win 0 <nop,nop,timestamp 1385725764 1130352553>
18:25:20.320889 IP our.backup.server.com.57877 > the.remote.server.com.rsync: . ack 281801068 win 32768 <nop,nop,timestamp 1131653961 1385607516,nop,nop,sack 3 {281822788:281824236}{281861884:281867804}{281857540:281858988}>
18:25:20.358544 IP the.remote.server.com.rsync > our.backup.server.com.57877: R 1436037516:1436037516(0) win 0

We have no problems with other machine on ADSL but with smaller directories.

Have you some ideas ?

Thanks in advance for your help.

Sam.

-- 

Sam Przyswa - Chef de projet
Arial Concept - Intï¿oerateur Internet
36, rue de Turin - 75008 - Paris - France
Tel: 01 40 54 86 04 - 0870 444 596 - Fax: 01 40 54 83 01
Skype ID: arial-concept
Web: http://www.arial-concept.com - Email: Info at arial-concept.com


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