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cmirror uses the CPG library to pass messages around the cluster and maintain its bitmaps. When a cluster mirror starts-up, it must send the current state to any joining members - a checkpoint. When mirrors are large (or the region size is small), the bitmap size can exceed the message limit of the CPG library. When this happens, the CPG library returns CPG_ERR_TRY_AGAIN. (This is also a bug in CPG, since the message will never be successfully sent.) There is an outstanding bug (bug 682771) that is meant to lift this message length restriction in CPG, but for now we work around the issue by increasing the mirror region size. This limits the size of the bitmap and avoids any issues we would otherwise have around checkpointing. Since this issue only affects cluster mirrors, the region size adjustments are only made on cluster mirrors. This patch handles cluster mirror issues involving pvmove, lvconvert (from linear to mirror), and lvcreate. It also ensures that when users convert a VG from single-machine to clustered, any mirrors with too many regions (i.e. a bitmap that would be too large to properly checkpoint) are trapped. |
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| .. | ||
| activate | ||
| cache | ||
| cache_segtype | ||
| commands | ||
| config | ||
| datastruct | ||
| device | ||
| display | ||
| error | ||
| filters | ||
| format1 | ||
| format_pool | ||
| format_text | ||
| freeseg | ||
| label | ||
| locking | ||
| log | ||
| metadata | ||
| mirror | ||
| misc | ||
| mm | ||
| properties | ||
| raid | ||
| replicator | ||
| report | ||
| snapshot | ||
| striped | ||
| thin | ||
| unknown | ||
| uuid | ||
| zero | ||
| Makefile.in | ||