[OmniOS-discuss] Ang: COMSTAR and blocksizes

[Stephan Budach]

----- Ursprüngliche Mail -----
> Von: "Johan Kragsterman" <johan.kragsterman at capvert.se>
> An: "Stephan Budach" <stephan.budach at jvm.de>
> CC: omnios-discuss at lists.omniti.com
> Gesendet: Donnerstag, 7. September 2017 12:08:45
> Betreff: Ang: [OmniOS-discuss] COMSTAR and blocksizes
> 
> 
> 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

It isn't one - it's a raw partition, an Intel SSD in this case.

Cheers,
Stephan
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