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shaba/lvm2

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Commit Graph

Author	SHA1	Message	Date
Jonathan Earl Brassow	f60175c308	Add the ability to convert LVs of "mirror" segtype to "raid1" segtype. Example: ~> lvconvert --type raid1 vg/mirror_lv Steps to convert "mirror" to "raid1" 1) Allocate a RAID metadata LV for each mirror image from the same PVs on which they are located. 2) Clear the metadata LVs. This involves writing LVM metadata, so we don't change any aspects of the mirror LV before this so that the user can easily remove LVs from the failed convert attempt while retaining the original mirror. 3) Remove the mirror log, if it exists. 4) Add metadata LVs to mirror LV 5) Rename mirror sub-lvs (s/mimage/rimage/) 6) Change flags and segtype from mirror to raid1	2011-10-07 14:56:01 +00:00
Jonathan Earl Brassow	d3582e0252	Add the ability to convert linear LVs to RAID1 Example: ~> lvconvert --type raid1 -m 1 vg/lv The following steps are performed to convert linear to RAID1: 1) Allocate a metadata device from the same PV as the linear device to provide the metadata/data LV pair required for all RAID components. 2) Allocate the required number of metadata/data LV pairs for the remaining additional images. 3) Clear the metadata LVs. This performs a LVM metadata update. 4) Create the top-level RAID LV and add the component devices. We want to make any failure easy to unwind. This is why we don't create the top-level LV and add the components until the last step. Should anything happen before that, the user could simply remove the unnecessary images. Also, we want to ensure that the metadata LVs are cleared before forming the array to prevent stale information from polluting the new array. A new macro 'seg_is_linear' was added to allow us to distinguish linear LVs from striped LVs.	2011-10-07 14:52:26 +00:00
Jonathan Earl Brassow	97db301ad4	Move RAID convert tests to new file, t-lvconvert-raid.sh There is duplicate code in t-lvconvert-raid.sh and t-lvcreate-raid.sh. This should be moved into a common file which is then sourced by these two files. I'll wait to move the duplicate code until I can talk to mornfall.	2011-08-18 19:56:17 +00:00

Author

SHA1

Message

Date

Jonathan Earl Brassow

f60175c308

Add the ability to convert LVs of "mirror" segtype to "raid1" segtype.

Example:
~> lvconvert --type raid1 vg/mirror_lv

Steps to convert "mirror" to "raid1"
1) Allocate a RAID metadata LV for each mirror image from the same PVs
   on which they are located.
2) Clear the metadata LVs.  This involves writing LVM metadata, so we don't
   change any aspects of the mirror LV before this so that the user can easily
   remove LVs from the failed convert attempt while retaining the original
   mirror.
3) Remove the mirror log, if it exists.
4) Add metadata LVs to mirror LV
5) Rename mirror sub-lvs (s/mimage/rimage/)
6) Change flags and segtype from mirror to raid1

2011-10-07 14:56:01 +00:00

Jonathan Earl Brassow

d3582e0252

Add the ability to convert linear LVs to RAID1

Example:
~> lvconvert --type raid1 -m 1 vg/lv

The following steps are performed to convert linear to RAID1:
1) Allocate a metadata device from the same PV as the linear device
   to provide the metadata/data LV pair required for all RAID components.
2) Allocate the required number of metadata/data LV pairs for the
   remaining additional images.
3) Clear the metadata LVs.  This performs a LVM metadata update.
4) Create the top-level RAID LV and add the component devices.

We want to make any failure easy to unwind.  This is why we don't create the
top-level LV and add the components until the last step.  Should anything
happen before that, the user could simply remove the unnecessary images.  Also,
we want to ensure that the metadata LVs are cleared before forming the array to
prevent stale information from polluting the new array.

A new macro 'seg_is_linear' was added to allow us to distinguish linear LVs
from striped LVs.

2011-10-07 14:52:26 +00:00

Jonathan Earl Brassow

97db301ad4

Move RAID convert tests to new file, t-lvconvert-raid.sh

There is duplicate code in t-lvconvert-raid.sh and t-lvcreate-raid.sh.
This should be moved into a common file which is then sourced by these two
files.  I'll wait to move the duplicate code until I can talk to mornfall.

2011-08-18 19:56:17 +00:00

3 Commits