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man: update lvmthin
Improve graphics form of page and use shorter correct and suggested forms of thin pool manipulation commands.
This commit is contained in:
Zdenek Kabelac
parent
e156837636
commit
d13efac51b
234
man/lvmthin.7.in
234
man/lvmthin.7.in
@ -95,166 +95,177 @@ appears as a snapshot of another LV after creation
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The primary method for using lvm thin provisioning:
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.nf
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1. create ThinDataLV
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.SS 1. create ThinDataLV
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Create an LV that will hold thin pool data.
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Create an LV that will hold thin pool data.
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Command
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lvcreate \-n ThinDataLV \-L LargeSize VG
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.B lvcreate \-n ThinDataLV \-L LargeSize VG
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Example
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# lvcreate \-n pool0 \-L 10G vg
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.I Example
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.br
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.B # lvcreate \-n pool0 \-L 10G vg
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2. create ThinMetaLV
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.SS 2. create ThinMetaLV
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Create an LV that will hold thin pool metadata.
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Create an LV that will hold thin pool metadata.
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Command
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lvcreate \-n ThinMetaLV \-L SmallSize VG
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.B lvcreate \-n ThinMetaLV \-L SmallSize VG
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Example
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# lvcreate \-n pool0meta \-L 1G vg
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.I Example
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.br
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.B # lvcreate \-n pool0meta \-L 1G vg
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# lvs
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# lvs
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LV VG Attr LSize
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pool0 vg -wi-a----- 10.00g
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pool0meta vg -wi-a----- 1.00g
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3. create ThinPoolLV
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.SS 3. create ThinPoolLV
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Combine the data and metadata LVs into a thin pool LV.
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ThinDataLV is renamed to hidden ThinPoolLV_tdata.
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ThinMetaLV is renamed to hidden ThinPoolLV_tmeta.
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The new ThinPoolLV takes the previous name of ThinDataLV.
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Combine the data and metadata LVs into a thin pool LV.
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ThinDataLV is renamed to hidden ThinPoolLV_tdata.
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ThinMetaLV is renamed to hidden ThinPoolLV_tmeta.
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The new ThinPoolLV takes the previous name of ThinDataLV.
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Command
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lvconvert \-\-thinpool VG/ThinDataLV \-\-poolmetadata VG/ThinMetaLV
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.B lvconvert \-\-thinpool VG/ThinDataLV \-\-poolmetadata VG/ThinMetaLV
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Example
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# lvconvert \-\-thinpool vg/pool0 \-\-poolmetadata vg/pool0meta
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.I Example
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.br
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.B # lvconvert \-\-thinpool vg/pool0 \-\-poolmetadata vg/pool0meta
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# lvs vg/pool0
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LV VG Attr LSize Pool Origin Data%
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pool0 vg twi-a-tz-- 10.00g 0.00
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# lvs vg/pool0
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LV VG Attr LSize Pool Origin Data% Meta%
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pool0 vg twi-a-tz-- 10.00g 0.00 0.00
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# lvs -a
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# lvs \-a
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LV VG Attr LSize
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pool0 vg twi-a-tz-- 10.00g
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[pool0_tdata] vg Twi-ao---- 10.00g
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[pool0_tmeta] vg ewi-ao---- 1.00g
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4. create ThinLV
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.SS 4. create ThinLV
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Create a new thin LV from the thin pool LV.
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The thin LV is created with a virtual size.
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Multiple new thin LVs may be created in the thin pool.
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Thin LV names must be unique in the VG.
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The thinpool argument specifies which thin pool will
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contain the ThinLV.
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Create a new thin LV from the thin pool LV.
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The thin LV is created with a virtual size.
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Multiple new thin LVs may be created in the thin pool.
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Thin LV names must be unique in the VG.
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The thinpool argument specifies which thin pool will
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contain the ThinLV.
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Command
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lvcreate \-\-type thin \-n ThinLV \-V VirtualSize \-\-thinpool VG/ThinPoolLV
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.B lvcreate \-n ThinLV \-V VirtualSize \-\-thinpool VG/ThinPoolLV
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.br
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.B lvcreate \-T \-n ThinLV \-V VirtualSize VG/ThinPoolLV
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Example
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Create a thin LV in a thin pool:
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# lvcreate \-\-type thin \-n thin1 \-V 1T \-\-thinpool vg/pool0
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.I Example
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.br
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Create a thin LV in a thin pool:
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.br
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.B # lvcreate \-T \-n thin1 \-V 1T vg/pool0
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Create another thin LV in the same thin pool:
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# lvcreate \-\-type thin \-n thin2 \-V 1T \-\-thinpool vg/pool0
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Create another thin LV in the same thin pool:
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.br
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.B # lvcreate \-n thin2 \-V 1T \-\-thinpool vg/pool0
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# lvs vg/thin1 vg/thin2
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# lvs vg/thin1 vg/thin2
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LV VG Attr LSize Pool Origin Data%
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thin1 vg Vwi-a-tz-- 1.00t pool0 0.00
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thin2 vg Vwi-a-tz-- 1.00t pool0 0.00
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5. create SnapLV
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.SS 5. create SnapLV
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Create snapshots of an existing ThinLV or SnapLV.
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Create snapshots of an existing ThinLV or SnapLV.
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Do not \fBNOT\fP specify
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.BR \-L ", " \-\-size
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since this would not create thin snapshot, but old COW volume.
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Command
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lvcreate \-\-type thin \-n SnapLV \-s ThinLV \-\-thinpool VG/ThinPoolLV
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lvcreate \-\-type thin \-n SnapLV \-s PrevSnapLV \-\-thinpool VG/ThinPoolLV
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.B lvcreate \-n SnapLV \-s VG/ThinLV
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.br
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.B lvcreate \-n SnapLV \-s VG/PrevSnapLV
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Example
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Create first snapshot of an existing ThinLV:
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# lvcreate \-\-type thin \-n thin1s1 \-s thin1 \-\-thinpool vg/pool0
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.I Example
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.br
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Create first snapshot of an existing ThinLV:
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.br
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.B # lvcreate \-n thin1s1 \-s vg/thin1
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Create second snapshot of the same ThinLV:
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# lvcreate \-\-type thin \-n thin1s2 \-s thin1 \-\-thinpool vg/pool0
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Create second snapshot of the same ThinLV:
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.br
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.B # lvcreate \-n thin1s2 \-s vg/thin1
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Create a snapshot of the first snapshot:
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# lvcreate \-\-type thin \-n thin1s1s1 \-s thin1s1 \-\-thinpool vg/pool0
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Create a snapshot of the first snapshot:
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.br
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.B # lvcreate \-n thin1s1s1 \-s vg/thin1s1
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# lvs vg/thin1s1 vg/thin1s2 vg/thin1s1s1
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# lvs vg/thin1s1 vg/thin1s2 vg/thin1s1s1
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LV VG Attr LSize Pool Origin
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thin1s1 vg Vwi---tz-k 1.00t pool0 thin1
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thin1s2 vg Vwi---tz-k 1.00t pool0 thin1
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thin1s1s1 vg Vwi---tz-k 1.00t pool0 thin1s1
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6. activate SnapLV
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Thin snapshots are created with the persistent "activation skip"
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flag, indicated by the "k" attribute. Use \-K with lvchange
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or vgchange to activate thin snapshots with the "k" attribute.
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.SS 6. activate SnapLV
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Command
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lvchange \-ay \-K VG/SnapLV
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Thin snapshots are created with the persistent "activation skip"
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flag, indicated by the "k" attribute. Use \-K with lvchange
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or vgchange to activate thin snapshots with the "k" attribute.
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Example
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# lvchange \-ay \-K vg/thin1s1
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.B lvchange \-ay \-K VG/SnapLV
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# lvs vg/thin1s1
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.I Example
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.br
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.B # lvchange \-ay \-K vg/thin1s1
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# lvs vg/thin1s1
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LV VG Attr LSize Pool Origin
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thin1s1 vg Vwi-a-tz-k 1.00t pool0 thin1
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.fi
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.SH Thin Topics
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Specify devices for data and metadata LVs
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.B Specify devices for data and metadata LVs
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.br
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Tolerate device failures using raid
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.B Tolerate device failures using raid
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.br
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Spare metadata LV
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.B Spare metadata LV
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.br
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Metadata check and repair
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.B Metadata check and repair
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.br
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Automatic pool metadata LV
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.B Automatic pool metadata LV
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.br
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Activation of thin snapshots
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.B Activation of thin snapshots
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.br
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Removing thin pool LVs, thin LVs and snapshots
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.B Removing thin pool LVs, thin LVs and snapshots
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.br
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Manually manage free data space of thin pool LV
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.B Manually manage free data space of thin pool LV
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.br
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Manually manage free metadata space of a thin pool LV
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.B Manually manage free metadata space of a thin pool LV
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.br
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Using fstrim to increase free space in a thin pool LV
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.B Using fstrim to increase free space in a thin pool LV
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.br
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Automatically extend thin pool LV
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.B Automatically extend thin pool LV
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.br
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Data space exhaustion
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.B Data space exhaustion
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.br
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Metadata space exhaustion
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.B Metadata space exhaustion
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.br
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Zeroing
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.B Zeroing
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.br
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Discard
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.B Discard
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.br
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Chunk size
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.B Chunk size
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.br
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Size of pool metadata LV
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.B Size of pool metadata LV
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.br
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Create a thin snapshot of an external, read only LV
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.B Create a thin snapshot of an external, read only LV
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.br
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Convert a standard LV to a thin LV with an external origin
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.B Convert a standard LV to a thin LV with an external origin
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.br
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Single step thin pool LV creation
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.B Single step thin pool LV creation
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.br
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Single step thin pool LV and thin LV creation
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.B Single step thin pool LV and thin LV creation
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.br
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Merge thin snapshots
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.br
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XFS on snapshots
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.B Merge thin snapshots
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.br
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.B XFS on snapshots
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\&
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@ -267,22 +278,26 @@ separate physical devices. To do that, specify the device name(s)
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at the end of the lvcreate line. It can be especially helpful
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to use fast devices for the metadata LV.
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.nf
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lvcreate \-n ThinDataLV \-L LargeSize VG LargePV
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lvcreate \-n ThinMetaLV \-L SmallSize VG SmallPV
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lvconvert \-\-thinpool VG/ThinDataLV \-\-poolmetadata VG/ThinMetaLV
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.B lvcreate \-n ThinDataLV \-L LargeSize VG LargePV
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.br
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.B lvcreate \-n ThinMetaLV \-L SmallSize VG SmallPV
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.br
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.B lvconvert \-\-thinpool VG/ThinDataLV \-\-poolmetadata VG/ThinMetaLV
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Example
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# lvcreate \-n pool0 \-L 10G vg /dev/sdA
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# lvcreate \-n pool0meta \-L 1G vg /dev/sdB
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# lvconvert \-\-thinpool vg/pool0 \-\-poolmetadata vg/pool0meta
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.fi
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.I Example
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.br
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.B # lvcreate \-n pool0 \-L 10G vg /dev/sdA
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.br
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.B # lvcreate \-n pool0meta \-L 1G vg /dev/sdB
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.br
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.B # lvconvert \-\-thinpool vg/pool0 \-\-poolmetadata vg/pool0meta
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.BR lvm.conf (5)
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.B thin_pool_metadata_require_separate_pvs
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.br
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controls the default PV usage for thin pool creation.
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\&
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.SS Tolerate device failures using raid
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@ -291,16 +306,19 @@ controls the default PV usage for thin pool creation.
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To tolerate device failures, use raid for the pool data LV and
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pool metadata LV. This is especially recommended for pool metadata LVs.
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.nf
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lvcreate \-\-type raid1 \-m 1 \-n ThinMetaLV \-L SmallSize VG PVA PVB
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lvcreate \-\-type raid1 \-m 1 \-n ThinDataLV \-L LargeSize VG PVC PVD
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lvconvert \-\-thinpool VG/ThinDataLV \-\-poolmetadata VG/ThinMetaLV
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.B lvcreate \-\-type raid1 \-m 1 \-n ThinMetaLV \-L SmallSize VG PVA PVB
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.br
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.B lvcreate \-\-type raid1 \-m 1 \-n ThinDataLV \-L LargeSize VG PVC PVD
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.br
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.B lvconvert \-\-thinpool VG/ThinDataLV \-\-poolmetadata VG/ThinMetaLV
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Example
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# lvcreate \-\-type raid1 \-m 1 \-n pool0 \-L 10G vg /dev/sdA /dev/sdB
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# lvcreate \-\-type raid1 \-m 1 \-n pool0meta \-L 1G vg /dev/sdC /dev/sdD
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# lvconvert \-\-thinpool vg/pool0 \-\-poolmetadata vg/pool0meta
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.fi
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.I Example
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.br
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.B # lvcreate \-\-type raid1 \-m 1 \-n pool0 \-L 10G vg /dev/sdA /dev/sdB
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.br
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.B # lvcreate \-\-type raid1 \-m 1 \-n pool0meta \-L 1G vg /dev/sdC /dev/sdD
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.br
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.B # lvconvert \-\-thinpool vg/pool0 \-\-poolmetadata vg/pool0meta
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.SS Spare metadata LV
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