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Problem Summary:

As a result of an asynchronous Direct I/O write using the io_ submit interface, a user file may contain undetected data corruption via writing of stale data to disk.

Users affected:

Users running IBM Spectrum Scale V4.1.0.4 through V4.1.1.7 or V4.2.0.0 through V4.2.0.3 on LINUX and using asynchronous Direct I/O via the io_submit interface. Applications using only Posix asynchronous Direct I/O will not experience the problem.

Recommendations:

1. Any customer using affected IBM Spectrum Scale code levels (4.1.0.4 through 4.1.1.7, or 4.2.0.0 through 4.2.0.3) should either (a) Stop using io_submit for asynchronous Direct I/O to perform write; or (b) wait until they are able to apply the fix pack or an efix by contacting IBM Service:

For IBM Spectrum Scale V4.2.0.0 thru V4.2.0.3, apply V4.2.0.4 or APAR IV86150.

For IBM Spectrum Scale V4.1.1.0 thru V4.1.1.7, apply V4.1.1.8 or APAR IV86149

For IBM GPFS V4.1.0.4 thru V4.1.0.8, apply V4.1.1.8 or APAR IV86151.

You can download V4.2.0.4 from Fix Central at

https://www-945.ibm.com/support/fixcentral/swg/selectFixes?parent=Software%2Bdefined%2Bstorage&product=ibm/StorageSoftware/IBM+Spectrum+Scale&release=4.2.0&platform=All&function=all

You can download V4.1.1.8 from Fix Central at

https://www-945.ibm.com/support/fixcentral/swg/selectFixes?parent=Software%2Bdefined%2Bstorage&product=ibm/StorageSoftware/IBM+Spectrum+Scale&release=4.1.1&platform=All&function=all

2. If you believe that your GPFS file system may be affected by this issue, you should contact IBM Service as soon as possible for further guidance and assistance.