Inconsistency between data written to multipath device and read from underlying paths
Issue
When testing the performance of a multipathed SAN storage array, data written to one device is not updated on the others even through they should all be the same data store.
If data is written to /dev/mapper/mpath1, then read from /dev/sdb, the updated data is not there. Similarly, writing to /dev/sdb and reading from /dev/sdc does not show the updated data.
Environment
- Red Hat Enterprise Linux
- device-mapper-multipath
- SAN storage
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