VMware guest experiencing slow IO performance during fstrim

This document (000019768) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15 SP1
SUSE Linux Enterprise Server 12 SP5

Situation

During fstrim, a VMware guest is experiencing slow disk I/O performance and throwing the following errors:

EXT4-fs (dm-8): discard request in group:201 block:25351 count:8651 failed with -5
sd 9:0:0:0: timing out command, waited 180s
sd 9:0:0:0: [sdd] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK
sd 9:0:0:0: [sdd] tag#0 CDB: Unmap/Read sub-channel 38 00 00 00 00 00 00 00 14 00
print_req_error: I/O error, dev sdd, sector 852457322

Resolution

This issue has been resolved on VMware vSphere 6.7 Patch ESXi670-202008001, as referenced on VMware KB#79277.

Cause

This is caused by a bug on ESXi 6.7 U2 or later, for more details please refer to WMware KB#79277 :
In ESXi 6.7 U2 or later Linux VMs fails unmap and windows VMs can hang or have slow IO performance (79277)

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

Document ID:000019768
Creation Date: 30-Oct-2020
Modified Date:31-Oct-2020
- SUSE Linux Enterprise Server
- SUSE Linux Enterprise Server for SAP Applications

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