blkScsi_Inquiry_CK: Unsupported Inquiry page-code 0x84

I did a test by using sg_vpd to query page 0x84 from a scaleio volume, and saw the exact same error messages in /var/log/messages.

[root@alex-sio1 ~]# sg_vpd -l --page 0x83  /dev/scinia

Device Identification VPD page:

   [PQual=0  Peripheral device type: disk]

  Addressed logical unit:

    designator type: EUI-64 based,  code set: Binary

      EUI-64 based 16 byte identifier

      Identifier extension: 0x6a49f84d2398d4b5

      IEEE Company_id: 0xee3bd1

      Vendor Specific Extension Identifier: 0x6a00000000

[root@alex-sio1 ~]# sg_vpd -l --page 0x84  /dev/scinia ; date

Software interface identification VPD page:

sense buffer empty

fetching VPD page failed

Tue Feb  6 23:10:23 CST 2018

[root@alex-sio1 ~]# tail /var/log/messages | grep 23:10:23

Feb  6 23:10:23 alex-sio1 kernel: ScaleIO R2_0 blkScsi_Inquiry_CK:405 :Error: Cmd ffff8803c47ae601: Unsupported Inquiry page-code 0x84

Pawel, thanks for the answer. I also did some research and found out more details about "page-code x84".

Per http://sg.danny.cz/sg/sdparm.html, manual of sdparm and sg_vpd (part of sg3_utils package).

Vital Product Data (VPD) pages are fetched with the SCSI INQUIRY command. While support for a "standard" INQUIRY response is mandatory, support for VPD page has been optional in the past. SPC-2 (which became a standard in 2001) and SPC-3 (ANSI INCITS 408-2005) made support for the "Device Identification" and the "Supported VPD pages" VPD pages mandatory. A utility like sdparm should be able to send an INQUIRY command and get a valid response when the target device or logical unit is in almost any state. SCSI devices are not required to respond to mode pages accesses when the device is in any state For example, often disk drives will not allow mode pages to be accessed or changed when the disk is spun down.

VPD pages are read only and in some situations may not be available (e.g. if the media is spun down or not present). Even in such cases the INQUIRY command should still respond with perhaps zero in the affected fields. VPD pages tend to have a variable number of descriptors rather than a predictable size with parameters in known positions such as most mode pages.

Here are some of the VPD pages that are currently decoded (listed in page number order):

[page 0x83] Device identification default; Contains designators for the addressed logical unit, target device and target port.

[page 0x84] Software Interface Identification;  one or more EUI-48 identifiers that can be used to define more precisely the peripheral device type.