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Oracle Linux: SCSI Devices On Fiberchannel Not Detected After Kernel Upgrade To Latest UEK5 (Doc ID 2695282.1)

Last updated on JULY 29, 2020

Applies to:

Linux OS - Version Oracle Linux 7.5 with Unbreakable Enterprise Kernel [4.14.35] and later
Linux x86-64

Symptoms

Unable to detect SCSI devices on fiberchannel when booted with latest kernel 4.14.35-1902.303.4.1.el7uek.x86_64 and above and FlashSystem-9840 devices are no more present

Before Kernel upgrade

#cat proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SAMSUNG MZ7KH1T9 Rev: 404Q
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SAMSUNG MZ7KH1T9 Rev: 404Q
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi4 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SuperMicro SSD Rev: 0R
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi14 Channel: 00 Id: 00 Lun: 00
Vendor: IBM Model: FlashSystem-9840 Rev: 1611
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi14 Channel: 00 Id: 00 Lun: 01
Vendor: IBM Model: FlashSystem-9840 Rev: 1611
Type: Direct-Access ANSI SCSI revision: 05

After Kernel upgrade

#cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SAMSUNG MZ7KH1T9 Rev: 404Q
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SAMSUNG MZ7KH1T9 Rev: 404Q
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi4 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: SuperMicro SSD Rev: 0R
Type: Direct-Access ANSI SCSI revision: 05

Cause

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In this Document
Symptoms
Cause
Solution
References


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