On Wed, Aug 21, 2019 at 3:35 PM Xinhuan Zheng <xzheng@xxxxxxxxxxxxxxxxx>
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/html/Online_Storage_Reconfiguration_Guide/task_controlling-scsi-command-timer-onlining-devices.html
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
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