[OmniOS-discuss] COMSTAR and blocksizes

Stephan Budach stephan.budach at jvm.de
Thu Sep 7 08:33:54 UTC 2017


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 

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