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[MX/PTX] Minor Alarm: 'VMHost RE x Disk y File System Errors'

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Article ID: KB36007 KB Last Updated: 20 Aug 2021Version: 2.0
Summary:

This article explains the meaning of the alarm VMHost RE 0 Disk 1 File System Errors that may be seen on MX and PTX routers and indicates if any actions need to be taken.

Symptoms:

Alarm seen on the device:

root> show system alarms
7 alarms currently active
Alarm time               Class  Description
2019-08-05 12:41:41 UTC  Minor  VMHost RE x Disk y File System Errors

This alarm is seen when there is a file system error on the disk of the Routing Engine. 

Solution:

NG-RE has two SSDs: SSD1 and SSD2. The first disk connected with channel 0 is the primary disk. The other disk is considered as a backup. There are two sets of software boot images on the primary disk. You boot with one set, and when an upgrade is needed, it switches to use the other set. Similarly, on the rollback, you switch to the other set.

In the alarm VMHost RE x Disk y File System Errors, x=0 for RE0 and 1 for RE1 and y=1 for disk 1 and 2 for disk 2.

To clear the alarm, boot the affected Routing Engine from a healthy disk and recover the impacted disk by using the following command:

Command:

> request vmhost snapshot

If the state of the primary disk (disk1) is good and the backup disk (disk2) has to be recovered, use the request vmhost snapshot command to recover the backup disk, assuming that the RE is booted from the primary disk. If the state of the secondary disk is not known or the file systems in the disk are not in a consistent state, then include the partition option in the command, that is, request vmhost snapshot partition.

If the state of the backup disk (disk2) is good and the primary disk (disk1) has to be recovered, use the request vmhost snapshot recovery command to recover the primary disk, assuming that the RE is booted from the backup disk. If the state of the primary disk is not known or the partition tables are in bad condition, then include the partition option in the command, that is, request vmhost snapshot recovery partition.

To boot from the desired disk, execute the request vmhost reboot { disk1, disk2} command.

Modification History:

2021-08-20: Modified article to include information about x and y in show system alarm

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