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25 lines
793 B
Markdown
25 lines
793 B
Markdown
# Common problems
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## Duplicate PVs in the system
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LVM tries to detect the common sources of duplicates, mdadm RAID and multipath,
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there are cases where duplicate PV appears on the system.
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There are two solutions to this problem:
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* Setting a *global_filter* configuration option.
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* Using of *devices_file* (See [lvmdevices(8)](https://man7.org/linux/man-pages/man8/lvmdevices.8.html))
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## Device Filtering
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*filter* and *global_filter* are meant to be used in two ways:
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* as an allow list, listing patterns for devices which will be accepted
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* `a|/dev/sdX|`, and rejecting the rest `r|.*|`,
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* as a reject list, listing only patterns for devices which will be rejected
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* `r|/dev/sdX|`,
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Even though there are situations where it works, mixing reject and accept
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patterns is not recommended.
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