Monday, January 23, 2012

TSM Backup Issue

Anyone had an issue where their backups were extremely slow and their Interrupts were huge? I've got 400GB DB's taking 40hrs to backup over a 4 port Ether-channel connection. No errors in my AIX errpt and the network guys are telling me they don't think it's them. Any suggestions on what to look at are appreciated.  Below is an example when I run entstat.

Device Type: IEEE 802.3ad Link Aggregation
Hardware Address: 00:14:5e:e7:26:41
Elapsed Time: 9 days 19 hours 20 minutes 35 seconds

Transmit Statistics:                          Receive Statistics:
--------------------                          -------------------
Packets: 5470416553                           Packets: 24510516113
Bytes: 440661650021                           Bytes: 32245892708954
Interrupts: 0                                 Interrupts: 6027433898
Transmit Errors: 0                            Receive Errors: 691
Packets Dropped: 0                            Packets Dropped: 0
                                              Bad Packets: 0
Max Packets on S/W Transmit Queue: 298
S/W Transmit Queue Overflow: 0
Current S/W+H/W Transmit Queue Length: 355

Broadcast Packets: 8786                       Broadcast Packets: -1346793420
Multicast Packets: 225928                     Multicast Packets: 136913
No Carrier Sense: 0                           CRC Errors: 0
DMA Underrun: 0                               DMA Overrun: 691
Lost CTS Errors: 0                            Alignment Errors: 0
Max Collision Errors: 0                       No Resource Errors: 0
Late Collision Errors: 0                      Receive Collision Errors: 0
Deferred: 141004                              Packet Too Short Errors: 0
SQE Test: 0                                   Packet Too Long Errors: 0
Timeout Errors: 0                             Packets Discarded by Adapter: 0
Single Collision Count: 0                     Receiver Start Count: 0
Multiple Collision Count: 0
Current HW Transmit Queue Length: 355

General Statistics:
No mbuf Errors: 0
Adapter Reset Count: 0
Adapter Data Rate: 1701737521
Driver Flags: Up Broadcast Running
        Simplex 64BitSupport ChecksumOffload
        PrivateSegment LargeSend DataRateSet


  1. HI Chad,

    Have you tried an FTP copy from source to TSM to heck the through put is what you imagined?

  2. can you please pout your options files (.sys and .opt) and a query system ?

  3. Please put your .opt and .sys files and also raise a query system
    backup direct on tape/disk .....

    and any relevant info


  4. Please put your .opt and .sys files and also raise a query system
    backup direct on tape/disk .....

    and any relevant info


  5. The problem is with the backup server not my clients. All my clients are being affected by this and it seems to be occurring on ALL my TSM servers on the backup network VLAN. The network Admins say they don't see any errors, so I'm left with the settings in AIX. Any ideas what I should look at?

  6. Hi Chad,

    As always, first question is: what changed?

    If you can, try ivorblognow's suggestion and copy a large file over via FTP or scp. That takes TSM and the DB out of the equation.

    Also, can you clear the stats (entstat -r) and see what kind of rate you are getting? Not sure if the interrupts are anything to be concerned about.

    Also also, what is the output for `entstat -p tcp `?

    Good luck,


  7. We cleared the stats and immediately the receive interrupts immediately started moving up. I tried the ftp but nothing conclusive.

  8. Transfering a 1GB file across the backup network averaged 17.4MB per second. No errors.

  9. Check my math, here's what I'm getting from your posted entstat output:

    9 days 19 hours 20 minutes 35 seconds

    ((9 * 24) + 19) * 60 + 20) * 60 + 35 = 847235 seconds

    32245892708954 bytes / 847235 seconds = 38,060,151 bytes/sec

    Average network throughput of 290.4 Mb/s

  10. Well if you take

    38,060,151bytes /1024 (KB) /1024 (MB) = 36.3MB/sec

  11. 36.3MB/sec * 8b/B = 290.4Mb/s

    So...assuming the system is running flat-out all the time, you might be maxing out a GigE connection there.

    What mode is that aggregated link?

  12. Hi,
    DMA Overrun: 691 indicates that your pci-bus is overloaded or it has not enough CPU to handle the 4GB network adapter on your system.

  13. Interestingly enough I didn't notice the DMA overruns, getting caught up in the interrupt amount. I'll definitely look into that because I am seeing it on all my TSM servers in the Power 6 frame. I think we may need to tweak the VIO servers settings.

  14. I have same issue with TSM 6.2.1

  15. Hi.
    Did You consider that issue can be on node DB side.
    Please try to transfer (archive) 50GB before, at this same time and after db backup.

  16. We're having a similar problem, and have so far tracked it down to the client side.

    Try using iperf. Run iperf -s on the tsm server, and "iperf -c -l 1M -w 10M $tsmname". This will tell you how the link is working between client and server. Iperf will either eliminate or spotlight the network between client and server.

    Assuming you're writing to disk pools, be sure to test your disk w/ something like dd.

    Keep in mind that LACP is not a load balancing protocol. If this client is one IP, then it's only talking to one port in your LACP interface in one VIO server.

    On the DMA overrun, we see this regularly, but interestingly, it's when the adapters are congesting at @ 107-109MB/s.

  17. We had similar problem, seeing exact same number of "Receive Errors" and "DMA Overrun" errors.

    Our admin found our TSM Server was running with these AIX default values:
    rfc1323 = 0
    tcp_recvspace = 16384
    tcp_sendspace = 16384

    This is significantly smaller than necessary for adequate throughput with our network setup (we also have 802.3ad bonded link). He followed the "TSM Performance Tuning Guide v6.2" (GC23-9788-02) which states on pages 6-7 (22-23/90 in pdf) that AIX should use minimum 64KB window, instead of 16KB.

    Here is the AIX config now, with greatly improved throughput:
    rfc1323 = 1
    tcp_recvspace = 64512
    tcp_sendspace = 64512

    Hope this helps!

    Robert L.

  18. Hi Chad,
    Did you get to the bottom of this? I am experiencing the same issue on a TSM 6.2.4 Windows 2008 R2 (no SP1) environment.

  19. Hi Chad,

    I have tsm server at and OS is aix. Now i have 2 client nodes which is taking long time to complete its systemstate backup when doing its daily incremental backup .
    The client OS is windows-2008 and has BA client version:

    Impact:actually my data expiration is taking almost 24 hours to complete and it is overlapping the next day schedule as previous process is still running , now checking the expiration activity from the summary table i found that 2 wintel nodes which is starting as per the daily admin schedule in the morning but getting completed the next day morning , sometime till afternoon . And now when i check those two nodes it has a two diff schedule one for normal fs backup and the other is for taking a system state object

    some thing like this
    tsm>q assoc G0_WIN TEMP_SYSSTATE

    Policy Domain Name Schedule Name Associated Nodes
    ------------------------------ ------------------------------ ----------------------------------------------------------------

    tsm: >q sched n=PRS02991 f=d

    Policy Domain Name: G0_WIN
    Schedule Name: G0_WIN_INC_2000
    Description: NON-LIVE Schedule
    Action: Incremental
    Priority: 5
    Start Date/Time: 05/20/11 20:00:00
    Duration: 4 Hour(s)
    Schedule Style: Classic
    Period: 1 Day(s)
    Day of Week: Any
    Day of Month:
    Week of Month:
    Last Update by (administrator): IN026082
    Last Update Date/Time: 08/10/12 13:22:47
    Associated Nodes: PRS02991
    Managing profile:

    Policy Domain Name: G0_WIN
    Schedule Name: TEMP_SYSSTATE
    Description: Schedule for SYSTEMSTATE Backup
    Action: Backup
    Subaction: Systemstate
    Priority: 5
    Start Date/Time: 11/23/12 17:30:00
    Duration: 15 Minute(s)
    Schedule Style: Classic
    Period: 1 Day(s)
    Day of Week: Any
    Day of Month:
    Week of Month:
    Last Update by (administrator): IN005166
    Last Update Date/Time: 11/23/12 16:31:08
    more... ( to continue, 'C' to cancel)

    Associated Nodes: PRS02991
    Managing profile:


    NODE details :

    PRS04811 --development

    PRS2991 --> production

    OS level =Windows 2008 , R2 Standard, SP 1
    Memory 12 Gb , Virtual Server , 2 cpu with 2.7Ghz.

    RMDV application is running .

    1Gps full du-plex .


    Client Version: Version 6, release 2, level 1.3


    Can you please help me in this resolving this ..or any hint ..

  20. you change de data base in solid disk for increment the o performance

  21. Interesting case, have you found the cause?