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Thread: Slow Attachment upload, slow sending messages with attachments

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    Join Date
    Aug 2013
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    Default Slow Attachment upload, slow sending messages with attachments

    Folks, let me preface this as my first post and apologize if I'm in the wrong area of the forums.

    Since installing Zimbra, our FOSS version 7 install was uploading attachments very quickly. The dedicated physical server has a public IP and internal IP, 16gb ram, 10k mdadm raid 5 disk, a 6 core desktop processor. Bandwidth available is 5 down / 0.768 up. There are about 45 active users at any time.

    Message attachment is taking a very long time and sending a message with an attachment is also taking a long time.

    Things tired (and the result)
    - firefox and chrome using public IP and private IP (no difference)
    - html and ajax interfaces (slower to upload attachment on html, slow to send on either)
    - different workstations (no difference)
    - workstations without antivirus (no difference)
    - restarting zimbra (no difference)
    - restarting the server (no difference)
    - updated zimbra to the latest version (no difference)
    - tail -f /opt/zimbra/log/mailbox.log (don't see any issues during the attachment or sending process)
    - top (no significant memory or cpu spikes while attaching or sending)
    - jnettop (no significant bandwidth spikes during attach or sending)
    - free (memory is about 90% utilized)
    - df -h (disks have lots of space
    - disabling dns checks in the web UI Global / MTA settings
    - disabling rbl in the web UI Global / MTA settings
    - dmesg gave us some peculiar output (However, IOSTAT on the array indicates good disk throughput)

    [398765.293044] ata2: SError: { Handshk }
    [398765.293864] ata2.00: failed command: WRITE FPDMA QUEUED
    [398765.294680] ata2.00: cmd 61/a8:08:e2:f1:65/01:00:40:00:00/40 tag 1 ncq 217088 out
    [398765.294681] res 40/00:0c:e2:f1:65/00:00:40:00:00/40 Emask 0x10 (ATA bus error)

    Is there a zimbra admin out there who has experienced this?

    Thanks in advance.
    Last edited by boomit; 08-28-2013 at 11:31 AM.

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