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Skip over LVs that have a cache LV in their tree of LV dependencies
when performing a pvmove.
This means that users cannot move a cache pool or a cache LV's origin -
even when that cache LV is used as part of another LV (e.g. a thin pool).
The new test (pvmove-cache-segtypes.sh) currently builds up various LV
stacks that incorporate cache LVs. pvmove tests are then performed to
ensure that cache related LVs are /not/ moved. Once pvmove is enabled
for cache, those tests will switch to ensuring that the LVs /are/
moved.
Test currently fails with make check_cluster - so uses 'should'
CLVMD[4f435880]: Feb 19 23:27:36 Send local reply
format_text/archiver.c:230 WARNING: This metadata update is NOT backed up
metadata/mirror.c:1105 Failed to initialize log device
metadata/mirror.c:1145 <backtrace>
lvconvert.c:1547 <backtrace>
lvconvert.c:3084 <backtrace>
Remove 'skip' argument passed into the function.
We always used '0' - as this is the only supported
option (-K) and there is no complementary option.
Also add some testing for behaviour of skipping.
There are typically 2 functions for the more advanced segment types that
deal with parameters in lvcreate.c: _get_*_params() and _check_*_params().
(Not all segment types name their functions according to this scheme.)
The former function is responsible for reading parameters before the VG
has been read. The latter is for sanity checking and possibly setting
parameters after the VG has been read.
This patch adds a _check_raid_parameters() function that will determine
if the user has specified 'stripe' or 'mirror' parameters. If not, the
proper number is computed from the list of PVs the user has supplied or
the number that are available in the VG. Now that _check_raid_parameters()
is available, we move the check for proper number of stripes from
_get_* to _check_*.
This gives the user the ability to create RAID LVs as follows:
# 5-device RAID5, 4-data, 1-parity (i.e. implicit '-i 4')
~> lvcreate --type raid5 -L 100G -n lv vg /dev/sd[abcde]1
# 5-device RAID6, 3-data, 2-parity (i.e. implicit '-i 3')
~> lvcreate --type raid6 -L 100G -n lv vg /dev/sd[abcde]1
# If 5 PVs in VG, 4-data, 1-parity RAID5
~> lvcreate --type raid5 -L 100G -n lv vg
Considerations:
This patch only affects RAID. It might also be useful to apply this to
the 'stripe' segment type. LVM RAID may include RAID0 at some point in
the future and the implicit stripes would apply there. It would be odd
to have RAID0 be able to auto-determine the stripe count while 'stripe'
could not.
The only draw-back of this patch that I can see is that there might be
less error checking. Rather than informing the user that they forgot
to supply an argument (e.g. '-i'), the value would be computed and it
may differ from what the user actually wanted. I don't see this as a
problem, because the user can check the device count after creation
and remove the LV if they have made an error.
When an origin exists and the 'lvcreate' command is used to create
a cache pool + cache LV, the table is loaded into the kernel but
never instantiated (suspend/resume was never called). A user running
LVM commands would never know that the kernel did not have the
proper state unless they also ran the dmsetup 'table/status' command.
The solution is to suspend/resume the cache LV to make the loaded
tables become active.
Introduce a new parameter called "approx_alloc" that is set when the
desired size of a new LV is specified in percentage terms. If set,
the allocation code tries to get as much space as it can but does not
fail if can at least get some.
One of the practical implications is that users can now specify 100%FREE
when creating RAID LVs, like this:
~> lvcreate --type raid5 -i 2 -l 100%FREE -n lv vg
Replace some in-test use of lvs commands with their check
and get equivalent.
Advantage is these 'checking' commands are not necessarily always
valiadated via extensive valgrind testing and also the output noice
is significantly reduces since the output of check/get is suppressed.
This patch allows users to create cache LVs with 'lvcreate'. An origin
or a cache pool LV must be created first. Then, while supplying the
origin or cache pool to the lvcreate command, the cache can be created.
Ex1:
Here the cache pool is created first, followed by the origin which will
be cached.
~> lvcreate --type cache_pool -L 500M -n cachepool vg /dev/small_n_fast
~> lvcreate --type cache -L 1G -n lv vg/cachepool /dev/large_n_slow
Ex2:
Here the origin is created first, followed by the cache pool - allowing
a cache LV to be created covering the origin.
~> lvcreate -L 1G -n lv vg /dev/large_n_slow
~> lvcreate --type cache -L 500M -n cachepool vg/lv /dev/small_n_fast
The code determines which type of LV was supplied (cache pool or origin)
by checking its type. It ensures the right argument was given by ensuring
that the origin is larger than the cache pool.
If the user wants to remove just the cache for an LV. They specify
the LV's associated cache pool when removing:
~> lvremove vg/cachepool
If the user wishes to remove the origin, but leave the cachepool to be
used for another LV, they specify the cache LV.
~> lvremove vg/lv
In order to remove it all, specify both LVs.
This patch also includes tests to create and remove cache pools and
cache LVs.
Avoid starting conversion of the LV to the thin pool and thin volume
at the same time. Since this is mostly a user mistake, do not try
to just convert to one of those type, since we cannot assume if the
user wanted LV to become thin volume or thin pool.
Before the fix tool reported pretty strange internal error:
Internal error: Referenced LV lvol1_tdata not listed in VG mvg.
Fixed output:
lvconvert --thinpool lvol0 -T mvg/lvol0
Can't use same LV mvg/lvol0 for thin pool and thin volume.
Since we are currently incapable of providing zeroes for
reextended thin volume area, let's disable extension of
such already reduce thin volumes.
(in-release change)
When lvm2 command forks, it calls reset_locking(),
which as an unwanted side effect unlinked lock file from filesystem.
Patch changes the behavior to just close locked file descriptor
in children - so the lock is being still properly hold in the parent.
Test LVM_LVMETAD_PIDFILE for pid for lvm command.
Fix WHATS_NEW envvar name usage
Fix init order in prepare_lvmetad to respect set vars
and avoid clash with system settings.
Update test to really test the 'is running' message.
Thin kernel target 1.9 still does not support online resize of
thin pool metadata properly - so disable it with expectation
for much higher version - and reenable after fixing kernel.
If we are stuck in user for too long without output,
grab kernel stack traces.
If we just produce too many lines of output, it's
not probably kernel related bug.
