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vgextend: Allow PVs to be added to VGs that have PVs missing

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Allowing people to add devices to a VG that has PVs missing helps
people avoid the inability to repair RAID LVs in certain cases.
For example, if a user creates a RAID 4/5/6 LV using all of the
available devices in a VG, there will be no spare devices to
repair the LV with if a device should fail.  Further, because the
VG is missing a device, new devices cannot be added to allow the
repair.  If 'vgreduce --removemissing' were attempted, the
"MISSING" PV could not be removed without also destroying the RAID
LV.

Allowing vgextend to operate solves the circular dependency.

When the PV is added by a vgextend operation, the sequence number is
incremented and the 'MISSING' flag is put on the PVs which are missing.
This commit is contained in:
Jonathan Brassow 2012-07-26 17:06:06 -05:00
parent 45db25817f
commit 186a2772e8
2 changed files with 8 additions and 2 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.97 - Version 2.02.97 -
=============================== ===============================
Allow vgextend to add PVs to a VG that is missing PVs.
Recognise Micron PCIe SSDs in filter and move array out to device-types.h. Recognise Micron PCIe SSDs in filter and move array out to device-types.h.
Fix segfault when attempting to replace RAID 4/5/6 device (2.02.97). Fix segfault when attempting to replace RAID 4/5/6 device (2.02.97).
Fix dumpconfig <node> to print only <node> without its siblings (2.02.89). Fix dumpconfig <node> to print only <node> without its siblings (2.02.89).

7
tools/vgextend.c
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@ -66,7 +66,12 @@ int vgextend(struct cmd_context *cmd, int argc, char **argv)
return EINVALID_CMD_LINE; return EINVALID_CMD_LINE;
} }
if (arg_count(cmd, restoremissing_ARG)) /*
* It is always ok to add new PVs to a VG - even if there are
* missing PVs. No LVs are affected by this operation, but
* repair processes - particularly for RAID segtypes - can
* be facilitated.
*/
cmd->handles_missing_pvs = 1; cmd->handles_missing_pvs = 1;
log_verbose("Checking for volume group \"%s\"", vg_name); log_verbose("Checking for volume group \"%s\"", vg_name);