`<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000'><div style="font-family: arial, helvetica, sans-serif;">Hi,</div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;"><br></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;">I am having trouble getting an issue sorted out, where omniOS 151020 complaints about mismatched blocksizes on some COMSTAR iSCSI LUNS, like this:</div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;"><br></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">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!</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">Sep 7 08:52:07 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk@g600144f0564d504f4f4c3037534c3033 (sd94):</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">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!</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">Sep 7 08:52:16 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk@g600144f0564d504f4f4c3037534c3132 (sd88):</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">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!</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">Sep 7 08:52:17 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk@g600144f0564d504f4f4c3038534c3033 (sd110):</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">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!</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">Sep 7 08:52:17 zfsha02gh79 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk@g600144f0564d504f4f4c3037534c3033 (sd94):</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">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!</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;"><br></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;">These COMSTAR LUNs are configured to export a blocksize 8k like this:</div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;"><br></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif">LU Name: 600144F0564D504F4F4C3037534C3132</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Operational Status: Online</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Provider Name : sbd</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Alias : nfsvmpool07Slot12</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> View Entry Count : 1</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Data File : /dev/rdsk/c3t50015178F364A264d0p1</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Meta File : not set</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Size : 200042414080</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Block Size : 8192</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Management URL : not set</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Vendor ID : SUN</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Product ID : COMSTAR</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Serial Num : not set</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Write Protect : Disabled</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Writeback Cache : Enabled</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b"><font face="courier new, courier, monaco, monospace, sans-serif"> Access State : Active</font></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;"><br></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;">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?</div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;"><br></div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;">Thanks,</div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;">Stephan</div><div id="197fc9ed-0c35-4b85-a95d-8c79cbc38b9b" style="font-family: arial, helvetica, sans-serif;"><br></div></div></div></div></body></html>`