https://bugzilla.kernel.org/show_bug.cgi?id=196493
Bug ID: 196493
Summary: When LUN assignments on the target was changed, event
must be triggered
Product: IO/Storage
Version: 2.5
Kernel Version: 3.13…4.4 and probably all other
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: SCSI
Assignee: [email protected]
Reporter: [email protected]
Regression: No
1. The (e.g. SAN) device is unmapped and then the same LUN is reused by other
WWN, but no actions taken on linux-side.
2. Kernel receives indication and claims "Kernel: [15671249.097583] sd
8:0:15:9: Warning! Received an indication that the LUN assignments on this
target have changed. The Linux SCSI layer does not automatically remap LUN
assignments."
3. Observe no further actions at kernel-side. ioctl (requested via blockdev)
returns parameters of unmapped LUN.
Expect at least to cock the trigger on respective device (like mapped to sysfs
"/sys/block/sd*/device/evt_lun_change_reported") and thus provide the mechanism
to inform device mapper. In perspective, the feature of auto-invalidation and
rescan on changed path.
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