IMPORTANT NOTICE: All SIOS Protection Suite for Linux Customers using DataKeeper for Linux


As our valued customer, we want to proactively notify you of an issue that we discovered in the md/raid1 kernel module of several Linux releases.

Due to this issue, a partial resync of data within supported versions (v9.3.2 – v9.5.1) of SIOS Protection Suite for Linux with DataKeeper cluster nodes may NOT resync all blocks. The following table shows the affected distributions and kernel versions:

Precautions to take immediately:

SIOS has created a kernel module patch that will provide a short-term solution to this issue and we are currently testing it.
We will make this patch available as soon as possible and we recommend customers apply it at their earliest convenience.
We will provide the availability date for this kernel patch on May 10. In the meantime, we recommend that you take the
following precautions immediately:

  1. Do not pause the mirror.
  1. Avoid partial resyncs as much as possible.
  1. Initiate a full resync after any partial resyncs, reboots of the target node, or switchover/failover from primary to target.

OPTIONALLY: Consider disabling automated failover and switchover for each node.

  1. When stopping replication to the target, we recommend taking the application out of service on the primary until the target is restarted.
  1. Continue to take frequent backups of your data.

For the long-term solution, SIOS has reported the issue and provided the fix to the Linux open source community and the fix has been accepted
by the Kernel Maintainer. In the future, should each OS vendor choose to implement that fix, SIOS will provide a method to return to using
the OS vendor-released kernel module at that time.

We strongly recommend that you take steps listed above to restore proper operation and/or prevent the issue from arising or contact SIOS Support immediately to determine if you are affected. If you have any additional questions, please reach out to SIOS Technical Support or your SIOS Sales Representative.

We are committed to the quality of our products and above all, to you, our valued customer. We will continue to keep you informed and we assure you that we always strive to provide you with the exceptional level of service you expect from SIOS Technology Corp.

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