On Wed, Aug 21, 2019 at 3:35 PM Xinhuan Zheng xzheng@christianbook.com wrote:
Hello Everyone,
We are using CentOS 5 system for certain application. Those are VM guests running in VMware. There is datastore issue occasionally, causing all file systems becoming read only file systems.
- Xinhuan Zheng
Orthogonal consideration: I don't know the version of vSphere you are using and if you are using or not VMware Tools inside your guests. But installing VMware tools in vSphere 4 or higher has the effect to change disk timeout for the guest to 180 seconds, from its default of 30 seconds (that I think is the same for RH EL/ CentOS 5,6,7) This may or may not help you in case of short time storage problems.
Eg on a 6.5 infrastructure with an old legacy CentOS 5.9 VM I have VMware Tools: Running, version:8305 (Unsupported older version) and inside guest
# service vmware-tools status vmtoolsd is running #
# find /sys/class/scsi_generic/*/device/timeout -exec grep -H . '{}' ; /sys/class/scsi_generic/sg0/device/timeout:180 /sys/class/scsi_generic/sg1/device/timeout:180 #
See also: this if you have access to Red Hat Customer Portal (disk scsi timeout and how to set it in RH EL 5): https://access.redhat.com/solutions/301963
Similar considerations for RH EL 6 and 7: https://access.redhat.com/solutions/2470541
This publicly accessible for RHEL 5 https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/htm...
this related to vSphere: https://kb.vmware.com/s/article/1009465
this for APD (All Paths Down) timeout that defaults to 140 seconds for block storage https://kb.vmware.com/s/article/2032934
HIH, Gianluca