[OmniOS-discuss] Ang: COMSTAR and blocksizes

[Johan Kragsterman]

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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