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Before the patch:
$ lvs -o name,active vg/lvol1 --driverloaded n
WARNING: Activation disabled. No device-mapper interaction will beattempted.
LV Active
lvol1 active
With this patch applied:
$ lvs -o name,active vg/lvol1 --driverloaded n
WARNING: Activation disabled. No device-mapper interaction will be attempted.
LV Active
lvol1 unknown
The same for active_{locally,remotely,exclusively} fields.
Also, rename headings for these fields (ActLocal/ActRemote/ActExcl).
If the lv_info call fails for whatever reason/INFO dm ioctl fails or
the dm driver communication is disabled (--driverloaded n), make
sure we always display "unknown" for LVSINFO fields as that's exactly
what happens - we don't know the state.
Before the patch:
$ lvs -o name,device_open --driverloaded n
WARNING: Activation disabled. No device-mapper interaction will be attempted.
Command failed with status code 5.
With this patch applied:
$ lvs -o name,device_open --driverloaded n
WARNING: Activation disabled. No device-mapper interaction will be attempted.
LV DevOpen
lvol1 unknown
Like other binary fields we already have:
$ lvs -o name,zero vg/lvx vg/pool vg/pool1
LV Zero
lvx unknown
pool
pool1 zero
$ lvs -o name,zero vg/lvx vg/pool vg/pool1 --binary
LV Zero
lvx -1
pool 0
pool1 1
Currently, we have two modes of activation, an unnamed nominal mode
(which I will refer to as "complete") and "partial" mode. The
"complete" mode requires that a volume group be 'complete' - that
is, no missing PVs. If there are any missing PVs, no affected LVs
are allowed to activate - even RAID LVs which might be able to
tolerate a failure. The "partial" mode allows anything to be
activated (or at least attempted). If a non-redundant LV is
missing a portion of its addressable space due to a device failure,
it will be replaced with an error target. RAID LVs will either
activate or fail to activate depending on how badly their
redundancy is compromised.
This patch adds a third option, "degraded" mode. This mode can
be selected via the '--activationmode {complete|degraded|partial}'
option to lvchange/vgchange. It can also be set in lvm.conf.
The "degraded" activation mode allows RAID LVs with a sufficient
level of redundancy to activate (e.g. a RAID5 LV with one device
failure, a RAID6 with two device failures, or RAID1 with n-1
failures). RAID LVs with too many device failures are not allowed
to activate - nor are any non-redundant LVs that may have been
affected. This patch also makes the "degraded" mode the default
activation mode.
The degraded activation mode does not yet work in a cluster. A
new cluster lock flag (LCK_DEGRADED_MODE) will need to be created
to make that work. Currently, there is limited space for this
extra flag and I am looking for possible solutions. One possible
solution is to usurp LCK_CONVERT, as it is not used. When the
locking_type is 3, the degraded mode flag simply gets dropped and
the old ("complete") behavior is exhibited.
We have 1/"descriptive word"/"yes" for 1 and 0/"no" for 0.
For example (the new recognized values are "yes" and "no"):
$ lvs -o name,device_open fedora vg/lvol1 vg/lvol2
LV DevOpen
root open
swap open
lvol1 open
lvol2
$ lvs -o name,device_open fedora vg/lvol1 vg/lvol2 -S 'device_open=open'
LV DevOpen
root open
swap open
lvol1 open
$ lvs -o name,device_open fedora vg/lvol1 vg/lvol2 -S 'device_open=1'
LV DevOpen
root open
swap open
lvol1 open
$ lvs -o name,device_open fedora vg/lvol1 vg/lvol2 -S 'device_open=yes'
LV DevOpen
root open
swap open
lvol1 open
$ lvs -o name,device_open fedora vg/lvol1 vg/lvol2 -S 'device_open=0'
LV DevOpen
lvol2
$ lvs -o name,device_open fedora vg/lvol1 vg/lvol2 -S 'device_open=no'
LV DevOpen
lvol2
So all attribute reporting functions are all in one section of code
for quick orientation (all these functions are defined in the order
of their attribute character displayed in pv/vg/lv_attr field).
lv_active_{locally,remotely,exclusively} display the original
"lv_active" field in a more separate way so that we can create
selection criteria in a binary-based form (yes/no).
The macros for reserved value definition makes the process a bit easier,
but there's still a place for improvement and make this even more
transparent. We can optimize and provide better automatism here later on.
Also respect --binary arg and/or report/binary_values_as_numeric
when displaying unknown values. If textual form is used, use "unknown",
if numeric value is used, use "-1" (which we already use to denote
unknown numeric values in other reports like lv_kernel_major and
lv_kernel_minor).
All binary attr fields have synonyms so selection criteria can use
either 0/1 or words to match against the field value (base type
for these binary fields is numeric one - DM_REPORT_FIELD_TYPE_NUMBER
so words are registered as reserved values):
pv_allocatable - "allocatable"
pv_exported - "exported"
pv_missing - "missing"
vg_extendable - "extendable"
vg_exported - "exported"
vg_partial - "partial"
vg_clustered - "clustered"
lv_initial_image_sync - "initial image sync", "sync"
lv_image_synced_names - "image synced", "synced"
lv_merging_names - "merging"
lv_converting_names - "converting"
lv_allocation_locked - "allocation locked", "locked"
lv_fixed_minor - "fixed minor", "fixed"
lv_merge_failed - "merge failed", "failed"
For example, these three are all equivalent:
$ lvs -o name,fixed_minor -S 'fixed_minor=fixed'
LV FixMin
lvol8 fixed minor
$ lvs -o name,fixed_minor -S 'fixed_minor="fixed minor"'
LV FixMin
lvol8 fixed minor
$ lvs -o name,fixed_minor -S 'fixed_minor=1'
LV FixMin
lvol8 fixed minor
The same with binary output - it has no effect on this functionality:
$ lvs -o name,fixed_minor --binary -S 'fixed_minor=fixed'
LV FixMin
lvol8 1
$ lvs -o name,fixed_minor --binary -S 'fixed_minor="fixed
minor"'
LV FixMin
lvol8 1
[1] f20/~ # lvs -o name,fixed_minor --binary -S 'fixed_minor=1'
LV FixMin
lvol8 1
The --binary option, if used, causes all the binary values reported
in reporting commands to be displayed as "0" or "1" instead of descriptive
literal values (value "unknown" is still used for values that could not be
determined).
Also, add report/binary_values_as_numeric lvm.conf option with the same
functionality as the --binary option (the --binary option prevails
if both --binary cmd option and report/binary_values_as_numeric lvm.conf
option is used at the same time). The report/binary_values_as_numeric is
also profilable.
This makes it easier to use and check lvm reporting command output in scripts.
Physical Volume Fields:
pv_allocatable - Whether this device can be used for allocation.
pv_exported - Whether this device is exported.
pv_missing - Whether this device is missing in system.
Volume Group Fields:
vg_permissions - VG permissions.
vg_extendable - Whether VG is extendable.
vg_exported - Whether VG is exported.
vg_partial - Whether VG is partial.
vg_allocation_policy - VG allocation policy.
vg_clustered - Whether VG is clustered.
Logical Volume Fields:
lv_volume_type - LV volume type.
lv_initial_image_sync - Whether mirror/RAID images underwent initial resynchronization.
lv_image_synced - Whether mirror/RAID image is synchronized.
lv_merging - Whether snapshot LV is being merged to origin.
lv_converting - Whether LV is being converted.
lv_allocation_policy - LV allocation policy.
lv_allocation_locked - Whether LV is locked against allocation changes.
lv_fixed_minor - Whether LV has fixed minor number assigned.
lv_merge_failed - Whether snapshot merge failed.
lv_snapshot_invalid - Whether snapshot LV is invalid.
lv_target_type - Kernel target type the LV is related to.
lv_health_status - LV health status.
lv_skip_activation - Whether LV is skipped on activation.
Logical Volume Info Fields
lv_permissions - LV permissions.
lv_suspended - Whether LV is suspended.
lv_live_table - Whether LV has live table present.
lv_inactive_table - Whether LV has inactive table present.
lv_device_open - Whether LV device is open.
LVSINFO is exactly the same as existing LVS report type,
but it has the "struct lvinfo" populated in addition for
use - this is useful for fields that display the status
of the LV device itself (e.g. suspended state, tables
present/missing...).
Currently, such properties are reported within the "lv_attr"
field so separation is unnecessary - the "lvinfo" call
to populate the "struct lvinfo" is directly a part of the
field reporting function - _lvstatus_disp/lv_attr_dup.
With upcoming patches, we'd like the lv_attr field bits
to be separated into their own fields. To avoid calling
"lvinfo" fn as many times as there are fields requiring
the "lv_info" structure to be populated while reporting
one row related to one LV, we're separating former LVS
into LVS and LVSINFO report type. With this, there's
just one "lvinfo" call for one report row and LV reporting
fields will take the info needed from this struct then,
hence reusing it and not calling "lvinfo" fn on their own.
The get_lv_type_name helps with translating volume type
to human readable form (can be used in reports or
various messages if needed).
The lv_is_linear and lv_is_striped complete the set of
lv_is_* functions that identify exact volume types.
Mention parent LV as well as the LV triggering the warning.
Still leaves some confusing cases but its not worth fixing them
at the moment.
(Thin pool inactive but a thin volume active => deactivate thin vol.
Inactive mirror/raid with pvmove in progress => complete pvmove and
active&deactivate mirror/raid.
If new VG already exists it requires some LVs to be inactive
unnecessarily.)
Support remove of thin volumes With --force --force
when thin pools is damaged.
This way it's possible to remove thin pool with
unrepairable metadata without requiring to
manually edit lvm2 metadata.
lvremove -ff vg/pool
removes all thin volumes and pool even when
thin pool cannot be activated (to accept
removal of thin volumes in kernel metadata)
Using suffixes for mirrors and raids will need more work,
before this could be enabled.
Meanwhile revert to previous behavior.
Keep suffixes for thins and caches.
Since vg_name inside /lib function has already been ignored mostly
except for a few debug prints - make it and official internal API
feature.
vg_name is used only in /tools while the VG is not yet openned,
and when lvresize/lvcreate /lib function is called with VG pointer
already being used, then vg_name becomes irrelevant (it's not been
validated anyway).
So any internal user of lvcreate_params and lvresize_params does not
need to set vg_name pointer and may leave it NULL.
Use suffixes for easier detection of private volumes.
This commit makes older volume UUIDs incompatible and
it most probably needs machine reboot after upgrade.
When creating pool's metadata - create initial LV for clearing with some
generic name and after the volume is create & cleared - rename it to
reserved name '_tmeta/_cmeta'.
We should not expose 'reserved' names for public LVs.
When repairing RAID LVs that have multiple PVs per image, allow
replacement images to be reallocated from the PVs that have not
failed in the image if there is sufficient space.
This allows for scenarios where a 2-way RAID1 is spread across 4 PVs,
where each image lives on two PVs but doesn't use the entire space
on any of them. If one PV fails and there is sufficient space on the
remaining PV in the image, the image can be reallocated on just the
remaining PV.
Previously, the seg_pvs used to track free and allocated space where left
in place after 'release_pv_segment' was called to free space from an LV.
Now, an attempt is made to combine any adjacent seg_pvs that also track
free space. Usually, this doesn't provide much benefit, but in a case
where one command might free some space and then do an allocation, it
can make a difference. One such case is during a repair of a RAID LV,
where one PV of a multi-PV image fails. This new behavior is used when
the replacement image can be allocated from the remaining space of the
PV that did not fail. (First the entire image with the failed PV is
removed. Then the image is reallocated from the remaining PVs.)
I've changed build_parallel_areas_from_lv to take a new parameter
that allows the caller to build parallel areas by LV vs by segment.
Previously, the function created a list of parallel areas for each
segment in the given LV. When it came time for allocation, the
parallel areas were honored on a segment basis. This was problematic
for RAID because any new RAID image must avoid being placed on any
PVs used by other images in the RAID. For example, if we have a
linear LV that has half its space on one PV and half on another, we
do not want an up-convert to use either of those PVs. It should
especially not wind up with the following, where the first portion
of one LV is paired up with the second portion of the other:
------PV1------- ------PV2-------
[ 2of2 image_1 ] [ 1of2 image_1 ]
[ 1of2 image_0 ] [ 2of2 image_0 ]
---------------- ----------------
Previously, it was possible for this to happen. The change makes
it so that the returned parallel areas list contains one "super"
segment (seg_pvs) with a list of all the PVs from every actual
segment in the given LV and covering the entire logical extent range.
This change allows RAID conversions to function properly when there
are existing images that contain multiple segments that span more
than one PV.
...to avoid using cached value (persistent filter) and therefore
not noticing any change made after last scan/filtering - the state
of the device may have changed, for example new signatures added.
$ lvm dumpconfig --type diff
allocation {
use_blkid_wiping=0
}
devices {
obtain_device_list_from_udev=0
}
$ cat /etc/lvm/cache/.cache | grep sda
$ vgscan
Reading all physical volumes. This may take a while...
Found volume group "fedora" using metadata type lvm2
$ cat /etc/lvm/cache/.cache | grep sda
"/dev/sda",
$ parted /dev/sda mklabel gpt
Information: You may need to update /etc/fstab.
$ parted /dev/sda print
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 134MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
$ cat /etc/lvm/cache/.cache | grep sda
"/dev/sda",
====
Before this patch:
$ pvcreate /dev/sda
Physical volume "/dev/sda" successfully created
With this patch applied:
$ pvcreate /dev/sda
Physical volume /dev/sda not found
Device /dev/sda not found (or ignored by filtering).
Take a local file lock to prevent concurrent activation/deactivation of LVs.
Thin/cache types and an extension for cluster support are excluded for
now.
'lvchange -ay $lv' and 'lvchange -an $lv' should no longer cause trouble
if issued concurrently: the new lock should make sure they
activate/deactivate $lv one-after-the-other, instead of overlapping.
(If anyone wants to experiment with the cluster patch, please get in touch.)
