[OmniOS-discuss] Ang: COMSTAR and blocksizes

Mon Sep 11 07:24:04 UTC 2017

> > ----- 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
> > 
> 
> Hi all,
> 
> I just exported this zpool from my omniOS 020 and imported it on a
> recent oi box and the issue with the 8k writes doesn't seem to be
> present on oi. Any thoughts on this?
> 
> Thanks,
> Stephan

I have the exact same behaviour on a freshly installed and updated omniosce 151022o:

root at vsm02:~# cat /etc/release
  OmniOS v11 r151022o
  Copyright 2017 OmniTI Computer Consulting, Inc. All rights reserved.
  Copyright 2017 OmniOS Community Edition (OmniOSce) Association.
  All rights reserved. Use is subject to license terms.
root at vsm02:~# tail -f /var/adm/messages
Sep 11 11:21:42 vsm02 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3038534c3033 (sd29):
Sep 11 11:21:42 vsm02   18 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 11 11:21:47 vsm02 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3037534c3033 (sd13):
Sep 11 11:21:47 vsm02   19 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 11 11:21:48 vsm02 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3037534c3132 (sd7):
Sep 11 11:21:48 vsm02   18 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 11 11:21:50 vsm02 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3037534c3131 (sd6):
Sep 11 11:21:50 vsm02   9 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 11 11:21:52 vsm02 scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/disk at g600144f0564d504f4f4c3038534c3033 (sd29):
Sep 11 11:21:52 vsm02   9 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!

Is this even a COMSTAR/iSCSI Initiator thing, or is this something else?

/stephan
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