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Error: "I/O timeout fetching online state from disk"

Last Updated: Jul 17, 2017 03:35PM PDT

Applies to...

  • DxEnterprise 15.0
  • DxEnterprise 15.5
  • DxEnterprise 16.0

Summary

When failing over migrated disks that have been replicated between multiple sites, you may encounter an error stating "I/O timeout fetching online state from disk..."

Event details

Log Name:      DH2i
Source:        DxStorMonitor
Date:          <date_time>
Event ID:      7018
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      <hostname>
Description:
I/O timeout Fetching online state from disk <disk_number>, command: <?xml version="1.0" encoding="utf-8" ?><rss><action>ll-device-update-details</action><params><para><device_path></para></params></rss>

Log Name:      DH2i
Source:        DxLMonitor
Date:          <date_time>
Event ID:      3003
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      <hostname>
Description:
Hostability alert for vhost <vhost> on <node>: Disk(s) unavailable: <disk_name>

Information

When there is an I/O event (i.e. PnP event, get disk detail), DxStorMonitor issues an IOCTL_DISK_GET_DISK_ATTRIBUTES to check whether or not the disk is online. If the query takes longer than 15 seconds, the DxStorMonitor will re-read disk identity information and re-compute the disk ID. The computed disk ID should be part of the managed disk list through the disktag.

There is a defect in the disk association routine for any migrated or replicated disks, wherein the disktag is no longer associated with the newly computed disk ID.  Engineering is looking into a permanent fix for this issue.

To work around this disktag re-association issue, please follow the procedure to reset the disktag for any migrated or replicated disk:

  1. Freeze the parent Vhost
  2. Un-manage all aliased disks associated with the Vhost
  3. Re-manage the disks un-managed in step (2)
  4. Associate the re-managed disks with the Vhost diskgroup
  5. Unfreeze the Vhost

Contact Us

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