Help Center/ Elastic Cloud Server/ FAQs/ Disk Partition, Attachment, and Expansion FAQ/ Why Are Disk Error Logs Printed After a Disk Attached to an ECS Is Formatted with the ext4 File System?
Updated on 2024-09-26 GMT+08:00
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Why Are Disk Error Logs Printed After a Disk Attached to an ECS Is Formatted with the ext4 File System?

Symptom

When a VBD disk is attached to an ECS and the partition is in ext4 format, the following log may be displayed on the console:

blk_update_request: operation not supported error, dev vdb, sector 826298624 op 0x9:(WRITE_ZEROES) flags 0x800 phys_seg 0 prio class 0

Figure 1 Printed logs

Involved OSs: Ubuntu 20.04, CentOS 8.0, CentOS 8.1, and other ECSs whose kernel versions are 4.18 or later

Root Cause

VBD disks do not support the advanced SCSI command WRITE_ZEROES.

If the ECS OS kernel version is 4.18 or later and the disk partition is formatted with the ext4 file system, the WRITE_ZEROES command is delivered. The system does not support the command and prints a log, which has no impact on the ECS performance and you can ignore it.