# [OmniOS-discuss] Ang: COMSTAR and blocksizes

Johan Kragsterman johan.kragsterman at capvert.se
Thu Sep 7 10:08:45 UTC 2017

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    Hi!

    -----"OmniOS-discuss" <omnios-discuss-bounces at lists.omniti.com> skrev: -----
    Till: omnios-discuss at lists.omniti.com
    Från: Stephan Budach
    Sänt av: "OmniOS-discuss"
    Datum: 2017-09-07 10:38
    Ärende: [OmniOS-discuss] COMSTAR and blocksizes

    Hi,

    I am having trouble getting an issue sorted out, where omniOS 151020 complaints about mismatched blocksizes on some COMSTAR iSCSI LUNS, like this:

    Sep  7 08:52:07 zfsha02gh79     104 I/O requests are not aligned with 8192 disk sector size in 10 seconds. They are handled through Read Modify Write but the performance is very low!
    Sep  7 08:52:07 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3037534c3033 (sd94):
    Sep  7 08:52:07 zfsha02gh79     79 I/O requests are not aligned with 8192 disk sector size in 10 seconds. They are handled through Read Modify Write but the performance is very low!
    Sep  7 08:52:16 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3037534c3132 (sd88):
    Sep  7 08:52:16 zfsha02gh79     20 I/O requests are not aligned with 8192 disk sector size in 10 seconds. They are handled through Read Modify Write but the performance is very low!
    Sep  7 08:52:17 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3038534c3033 (sd110):
    Sep  7 08:52:17 zfsha02gh79     1 I/O requests are not aligned with 8192 disk sector size in 10 seconds. They are handled through Read Modify Write but the performance is very low!
    Sep  7 08:52:17 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3037534c3033 (sd94):
    Sep  7 08:52:17 zfsha02gh79     24 I/O requests are not aligned with 8192 disk sector size in 10 seconds. They are handled through Read Modify Write but the performance is very low!

    These COMSTAR LUNs are configured to export a blocksize 8k like this:

    LU Name: 600144F0564D504F4F4C3037534C3132
        Operational Status: Online
        Provider Name     : sbd
        Alias             : nfsvmpool07Slot12
        View Entry Count  : 1
        Data File         : /dev/rdsk/c3t50015178F364A264d0p1
        Meta File         : not set
        Size              : 200042414080
        Block Size        : 8192
        Management URL    : not set
        Vendor ID         : SUN
        Product ID        : COMSTAR
        Serial Num        : not set
        Write Protect     : Disabled
        Writeback Cache   : Enabled
        Access State      : Active

    Now, the system seems to recognize the 8k, but for whatever reason, doesn't adjust the block size accordingly. It does that for the 4k LUNs, however, so I am unsure, on how to tackle this? Any tipp, anyone could share?

    Thanks,
    Stephan

    What's in the bottom here?

    Data File         : /dev/rdsk/c3t50015178F364A264d0p1

    It dosesn't look like a zvol?

    /Johan

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