You're almost there! Please answer a few more questions for access to the Applications content. Complete registration
Interested in joining? Complete your registration by providing Areas of Interest here. Register

The Root Filesystem Turns Read-only With I/O errors On An OCI Instance Running Ubuntu 18.04

edited Jun 30, 2022 1:51PM in Linux

An Oracle Cloud Infrastructure (OCI) Instance running Ubuntu 18.04 as its operating system experiences its root filesystem turning read-only with I/O errors. The root filesystem is on an iSCSI volume.

An OCI instance running Ubuntu 18.04 can experience its root filesystem turning read-only, with the following kinds of I/O errors being logged to the storage volume being used for the root filesystem in the instance's syslog or /var/log/messages log file:

[1823765.929408] sd 3:0:0:1: [sdb] tag#0 FAILED Result: hostbyte=DID_IMM_RETRY driverbyte=DRIVER_OK

[1823765.929411] sd 3:0:0:1: [sdb] tag#0 CDB: Read(10) 28 00 00 13 b7 68 00 00 08 00

[1823765.929413] print_req_error: I/O error, dev sdb, sector 1292136 <<<<<<<<<<<<<<

The volume used by the root filesystem is attached to the instance using iSCSI. iSCSId is disabled by default in the October release of the Oracle-provided Ubuntu 18.04 image, so instances using this operating system may experience a system hang or I/O errors if there is a momentary break in iSCSI communication between the instance and the iSCSI storage unit.

Howdy, Stranger!

Log In

To view full details, sign in.

Register

Don't have an account? Click here to get started!