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This patch adds a vgmetadatacopies parameter for metadata balancing. This parameter provides a simple way for users to create a policy for placing metadata on PVs automatically by LVM. The behavior is implemented inside LVM by managing the 'ignore' mda bits. We chose the name 'vgmetadatacopies' as this is a natural extension to the existing parameter 'pvmetadatacopies' / 'metadatacopies' in pvcreate. This is a first step at VG parameter based metadata balancing. Most users will probably want to state that they want a certain number of PVs to contain metadata, and they may be less concerned about a specific number of metadata copies in the volume group. However, for default values (pvmetadatacopies is 1 by default), the number of metadatacopies in the volume group, and the number of PVs with metadata are the same. In the future we could add vgmetadatacopiespvs to define more specifically the number of pvs in the VG that contain metadata, but for now we start with this parameter. Another possible future extension would be to define a specific pv tag to mark the set of PVs that should be used for metadata balancing. This tag based approach could be used in conjunction with 'vgmetadatacopies'. Signed-off-by: Dave Wysochanski <dwysocha@redhat.com> |
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| COPYING | ||
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| INSTALL | ||
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| README | ||
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| WHATS_NEW | ||
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This tree contains the LVM2 and device-mapper tools and libraries. For more information about LVM2 read the changelog in the WHATS_NEW file. Installation instructions are in INSTALL. There is no warranty - see COPYING and COPYING.LIB. Tarballs are available from: ftp://sources.redhat.com/pub/lvm2/ To access the CVS tree use: cvs -d :pserver:cvs@sources.redhat.com:/cvs/lvm2 login CVS password: cvs cvs -d :pserver:cvs@sources.redhat.com:/cvs/lvm2 co LVM2 Mailing list for general discussion related to LVM2: linux-lvm@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/linux-lvm Mailing list for LVM2 development, patches and commits: lvm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/linux-lvm Mailing list for device-mapper development, including kernel patches and multipath-tools: dm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/dm-devel