Re:Backup Speed is slower Dell Powervault TL4000,Qlogic Fibre Channel Adapter and Widows 2003 Std

Posted on 2009-02-18
Last Modified: 2012-05-06
We only get 700 MB/Min average speed about backup 30 GB files from local HD to Tape Lib.
I discoed some settings on QLogic Fibre Channel Card, but I am not sure do I need to config that?
Please help

Question by:FphcareAdmins
    LVL 22

    Expert Comment

    Is the SAN 1, 2, or 4gb?
    What is the average file size?
    How many files are being backed up?
    Is one or two backups running at the same time?
    How much RAM does the server have?
    What type of files are being backed up?
    or in other words is the data compressed or binary that compresses little such as zip, jpg, mp3, etc.


    Author Comment

    Is the SAN 1, 2, or 4gb?
    What is the average file size?
    How many files are being backed up?
    Is one or two backups running at the same time?
    2 Backups
    How much RAM does the server have?
    2GB RAM.
    What type of files are being backed up? or in other words is the data compressed or binary that compresses little such as zip, jpg, mp3, etc.
    Office files, jpg, vob, db etc.
    LVL 22

    Expert Comment

    4gb should support well more than 700mb/m.
    file size and # is going to add significant overhead and will be a limiting factor
    2 bkups so double the resources is needed
    and so 2gb might not be enough
    those compressed and binary files will also lower throughput

    Start by running Task Manager to monitor memory and I/O while the backups are running. Once open go to the Processes tab and then View Select Columns to add additional objects.

    Based off that you can tell if it will benefit more RAM.

    If possible, consider configuring so each HBA sees one of the tape drives. Often this will help as well.

    Check to see if your backup application supports multiplexing. That is where multiple sessions are written to the same tape at the same time.

    Check the virus detection program scans outgoing files or file reads. This can also effect throughput.

    As a test setup at least 5gb of data, the bigger the files the better. Then run just one backup job to see if it has a significantly higher throughput.

    How about at the library end. Is it also 4gb? Ooo what if it is only 1gb, then you have two jobs sharing that one 1gb connection and that could be the cause. It is probably a good idea to add that second port so you have one for each drive.

    Author Comment

    Each HBA only can see one of the tape drives.

    We are using ARCServe 12.0 SP1 and it support multiplexing very well. We have run a test on a test backup server (same sever as live one) with SCSI Tape Drive.  We can get 6000MB/MIN MAX Speed by LTO3, the test data size is 80GB total

    We don't have Antivirus application on backup server.

    The setup is auto speed, and it is 4Gb/s shows on drive status.

    Author Comment

    Hi there.. any suggestions please?
    LVL 22

    Accepted Solution

    ARCserve Manager, Server Admin, select the server, click Configuration, Job Engine tab try increasing Buffer size.

    Try increasing Multiplexing Chuck Size.

    Start with the Job Engine buffer size. The default it 256 and the max is 512. Increase it only one step at a time, so the next is 320k.

    Then run one or two backups to see the difference. If it was improved then bump it up another notch and test again.

    The thing is that with both of these settings there is a sweet spot, too small and too large will have a negative effect.

    First before you make any change open a new spreadsheet. Bear with me here this can be a pain but it really really does help. Now go to the Job Status window, Job Queue tab, now for the Full backups only, go to the Job Log and then under the section MESSAGES OF CHILD JOB

    Now make a chart with the first column for the system and volume, then following columns for the different days.  Under the date list the throughput for each session. Discount any session less than a gig, like differential and incremental jobs there is too much overhead to be of value for troubleshooting throughput. Make a note at the bottom for configuration changes.  For example on 03/20 increased Job Engine buffers from 256 to 320.  

    But before making any changes get at least three days worth of throughputs charted so there is a good baseline to work from. If the results are inconsistent the collect more days worth.

    Oh one more thing I just thought of. Duplicate one of the backup jobs as a test to see if the throughput is higher when this same job is running alone. Often if you have two jobs running at 700mb/m, if you run just one alone it will run at around 1300 to 1400mb/m. This would indicate bus saturation is 1400mb/m at some point.  

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