Hi,  Yes, we don't support this particular INQ page code. And yes, there are many SCSI commands ScaleIO doesn't support - just like every other array ;-) It is impossible to support all of them, many are deprecated, many are vendor/product specific etc.  I might talk to Development if we can supress these messages in one of the newer versions, but for the time being they can  be simply ignored.  Hope it helps.  Cheers, Pawel
ScaleIO 2.0.1.3 CentOS 6.8 Kernel: 2.6.32-642.el6.x86_64 Structure: 2-layer with standalone SDC nodes  While testing ScaleIO with Oracle running on its volume, we see a lot of following errors in /var/log/messages of SDC nodes:  Cmd ffff880aeabb6781: Unsupported Inquiry page-code 0x84 Jan 26 16:03:00 b201i23rs01 kernel: ScaleIO R2_0 blkScsi_Inquiry_CK:405 :Error: Cmd ffff880aeabb60a1: Unsupported Inquiry page-code 0x84 Jan 26 16:03:00 b201i23rs01 kernel: ScaleIO R2_0 blkScsi_Inquiry_CK:405 :Error: Cmd ffff880e198a7741: Unsupported Inquiry page-code 0x84 Jan 26 16:03:00 b201i23rs01 kernel: ScaleIO R2_0 blkScsi_Inquiry_CK:405 :Error: Cmd ffff880e198a7741: Unsupported Inquiry page-code 0x84 Jan 26 16:03:00 b201i23rs01 kernel: ScaleIO R2_0 blkScsi_Inquiry_CK:405 :Error: Cmd ffff880e198a7741: Unsupported Inquiry page-code 0x84 Jan 26 16:03:00 b201i23rs01 kernel: ScaleIO R2_0 blkScsi_Inquiry_CK:405 :Error: Cmd ffff880e198a7741: Unsupported Inquiry page-code 0x84  It seems that ScaleIO does not recognize some SCSI commands. Is there any SCSI operations that ScaleIO does not support?  Thanks  Message was edited by: vespasianvs
blkScsi_Inquiry_CK: Unsupported Inquiry page-code 0x84