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man: add more examples to lvmraid(7)
Add examples for reshaping number of stripes and converting from raid6 to striped to raid10. Remove trailing spaces. Related: rhbz834579 Related: rhbz1191935 Related: rhbz1191978
This commit is contained in:
Heinz Mauelshagen
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d2aae8cff4
234
man/lvmraid.7.in
234
man/lvmraid.7.in
@ -1031,7 +1031,7 @@ for out-of-place reshaping. The result is:
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.nf
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# lvs -a -o lv_name,segtype,seg_pe_ranges,dataoffset
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LV Type PE Ranges Doff
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LV Type PE Ranges DOff
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lv raid6_nr lv_rimage_0:0-32 \\
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lv_rimage_1:0-32 \\
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lv_rimage_2:0-32 \\
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@ -1051,6 +1051,238 @@ for out-of-place reshaping. The result is:
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All segments with PE ranges '33-33' provide the out-of-place reshape space.
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The dataoffset column shows that the data was moved from initial offset 0 to
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2048 sectors on each component DataLV.
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If the RaidLV should be restriped for performance reasons,
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convert the 3-way striped raid6_nr LV to 5-way-striped.
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.nf
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# lvconvert --stripes 5 -y tb/lv
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Using default stripesize 64.00 KiB.
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WARNING: Adding stripes to active logical volume tb/lv will grow it from 99 to 165 extents!
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Run "lvresize -l99 tb/lv" to shrink it or use the additional capacity.
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Logical volume tb/lv successfully converted.
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# lvs
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LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
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root fedora -wi-ao---- 15.00g
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swap fedora -wi-ao---- 3.99g
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lv tb rwi-a-r-s- 652.00m 52.94
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# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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LV Attr Type PE Ranges DOff
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lv rwi-a-r--- raid6_nr lv_rimage_0:0-33 lv_rimage_1:0-33 lv_rimage_2:0-33 lv_rimage_3:0-33 lv_rimage_4:0-33 lv_rimage_5:0-33 lv_rimage_6:0-33 0
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[lv_rimage_0] iwi-aor--- linear /dev/sda:0-32 0
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[lv_rimage_0] iwi-aor--- linear /dev/sda:34-34
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[lv_rimage_1] iwi-aor--- linear /dev/sdaa:0-32 0
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[lv_rimage_1] iwi-aor--- linear /dev/sdaa:34-34
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[lv_rimage_2] iwi-aor--- linear /dev/sdab:0-32 0
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[lv_rimage_2] iwi-aor--- linear /dev/sdab:34-34
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[lv_rimage_3] iwi-aor--- linear /dev/sdac:1-34 0
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[lv_rimage_4] iwi-aor--- linear /dev/sdad:1-34 0
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[lv_rimage_5] iwi-aor--- linear /dev/sdae:1-34 0
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[lv_rimage_6] iwi-aor--- linear /dev/sdaf:1-34 0
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[lv_rmeta_0] ewi-aor--- linear /dev/sda:33-33
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[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:33-33
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[lv_rmeta_2] ewi-aor--- linear /dev/sdab:33-33
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[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
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[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
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[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
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[lv_rmeta_6] ewi-aor--- linear /dev/sdaf:0-0
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.fi
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Convert the 5-way striped raid6_nr LV to 4-way-striped.
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The force option needs to be used, because removing stripes
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(i.e. image SubLVs) from a RaidLV will shrink its size.
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.nf
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# lvconvert --stripes 4 --force -y tb/lv
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Using default stripesize 64.00 KiB.
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WARNING: Removing stripes from active logical volume tb/lv will shrink it from 660.00 MiB to 528.00 MiB!
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THIS MAY DESTROY (PARTS OF) YOUR DATA!
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If that leaves the logical volume larger than 206 extents due to stripe rounding,
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you may want to grow the content afterwards (filesystem etc.)
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WARNING: too remove freed stripes after the conversion has finished, you have to run "lvconvert --stripes 4 tb/lv"
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Logical volume tb/lv successfully converted.
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# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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LV Attr Type PE Ranges DOff
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lv rwi-a-r-s- raid6_nr lv_rimage_0:0-33 lv_rimage_1:0-33 lv_rimage_2:0-33 lv_rimage_3:0-33 lv_rimage_4:0-33 lv_rimage_5:0-33 lv_rimage_6:0-33 0
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[lv_rimage_0] Iwi-aor--- linear /dev/sda:0-32 0
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[lv_rimage_0] Iwi-aor--- linear /dev/sda:34-34
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[lv_rimage_1] Iwi-aor--- linear /dev/sdaa:0-32 0
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[lv_rimage_1] Iwi-aor--- linear /dev/sdaa:34-34
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[lv_rimage_2] Iwi-aor--- linear /dev/sdab:0-32 0
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[lv_rimage_2] Iwi-aor--- linear /dev/sdab:34-34
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[lv_rimage_3] Iwi-aor--- linear /dev/sdac:1-34 0
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[lv_rimage_4] Iwi-aor--- linear /dev/sdad:1-34 0
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[lv_rimage_5] Iwi-aor--- linear /dev/sdae:1-34 0
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[lv_rimage_6] Iwi-aor-R- linear /dev/sdaf:1-34 0
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[lv_rmeta_0] ewi-aor--- linear /dev/sda:33-33
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[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:33-33
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[lv_rmeta_2] ewi-aor--- linear /dev/sdab:33-33
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[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
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[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
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[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
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[lv_rmeta_6] ewi-aor-R- linear /dev/sdaf:0-0
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.fi
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The 's' in column 9 of the attribute field shows the RaidLV is still reshaping.
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The 'R' in the same column of the attribute field shows the freed image Sub LVs which will need removing once the reshaping finished.
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.nf
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# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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LV Attr Type PE Ranges DOff
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lv rwi-a-r-R- raid6_nr lv_rimage_0:0-33 lv_rimage_1:0-33 lv_rimage_2:0-33 lv_rimage_3:0-33 lv_rimage_4:0-33 lv_rimage_5:0-33 lv_rimage_6:0-33 8192
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.fi
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Now that the reshape is finished the 'R' atribute on the RaidLV shows images can be removed.
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.nf
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# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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LV Attr Type PE Ranges DOff
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lv rwi-a-r-R- raid6_nr lv_rimage_0:0-33 lv_rimage_1:0-33 lv_rimage_2:0-33 lv_rimage_3:0-33 lv_rimage_4:0-33 lv_rimage_5:0-33 lv_rimage_6:0-33 8192
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.fi
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This is achieved by repeating the command ("lvconvert --stripes 4 tb/lv" would be sufficient).
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.nf
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# lvconvert --stripes 4 --force -y tb/lv
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Using default stripesize 64.00 KiB.
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Logical volume tb/lv successfully converted.
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# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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LV Attr Type PE Ranges DOff
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lv rwi-a-r--- raid6_nr lv_rimage_0:0-33 lv_rimage_1:0-33 lv_rimage_2:0-33 lv_rimage_3:0-33 lv_rimage_4:0-33 lv_rimage_5:0-33 8192
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[lv_rimage_0] iwi-aor--- linear /dev/sda:0-32 8192
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[lv_rimage_0] iwi-aor--- linear /dev/sda:34-34
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[lv_rimage_1] iwi-aor--- linear /dev/sdaa:0-32 8192
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[lv_rimage_1] iwi-aor--- linear /dev/sdaa:34-34
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[lv_rimage_2] iwi-aor--- linear /dev/sdab:0-32 8192
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[lv_rimage_2] iwi-aor--- linear /dev/sdab:34-34
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[lv_rimage_3] iwi-aor--- linear /dev/sdac:1-34 8192
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[lv_rimage_4] iwi-aor--- linear /dev/sdad:1-34 8192
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[lv_rimage_5] iwi-aor--- linear /dev/sdae:1-34 8192
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[lv_rmeta_0] ewi-aor--- linear /dev/sda:33-33
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[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:33-33
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[lv_rmeta_2] ewi-aor--- linear /dev/sdab:33-33
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[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
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[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
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[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
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# lvs -a -o lv_name,attr,segtype,reshapelen tb
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LV Attr Type RSize
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lv rwi-a-r--- raid6_nr 24.00m
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[lv_rimage_0] iwi-aor--- linear 4.00m
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[lv_rimage_0] iwi-aor--- linear
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[lv_rimage_1] iwi-aor--- linear 4.00m
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[lv_rimage_1] iwi-aor--- linear
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[lv_rimage_2] iwi-aor--- linear 4.00m
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[lv_rimage_2] iwi-aor--- linear
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[lv_rimage_3] iwi-aor--- linear 4.00m
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[lv_rimage_4] iwi-aor--- linear 4.00m
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[lv_rimage_5] iwi-aor--- linear 4.00m
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[lv_rmeta_0] ewi-aor--- linear
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[lv_rmeta_1] ewi-aor--- linear
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[lv_rmeta_2] ewi-aor--- linear
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[lv_rmeta_3] ewi-aor--- linear
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[lv_rmeta_4] ewi-aor--- linear
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[lv_rmeta_5] ewi-aor--- linear
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.fi
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If the reshape space shall be removed any lvconvert command not changing the layout can be used:
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.nf
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# lvconvert --stripes 4 tb/lv
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Using default stripesize 64.00 KiB.
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No change in RAID LV tb/lv layout, freeing reshape space.
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Logical volume tb/lv successfully converted.
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# lvs -a -o lv_name,attr,segtype,reshapelen tb
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LV Attr Type RSize
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lv rwi-a-r--- raid6_nr 0
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[lv_rimage_0] iwi-aor--- linear 0
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[lv_rimage_0] iwi-aor--- linear
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[lv_rimage_1] iwi-aor--- linear 0
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[lv_rimage_1] iwi-aor--- linear
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[lv_rimage_2] iwi-aor--- linear 0
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[lv_rimage_2] iwi-aor--- linear
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[lv_rimage_3] iwi-aor--- linear 0
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[lv_rimage_4] iwi-aor--- linear 0
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[lv_rimage_5] iwi-aor--- linear 0
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[lv_rmeta_0] ewi-aor--- linear
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[lv_rmeta_1] ewi-aor--- linear
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[lv_rmeta_2] ewi-aor--- linear
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[lv_rmeta_3] ewi-aor--- linear
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[lv_rmeta_4] ewi-aor--- linear
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[lv_rmeta_5] ewi-aor--- linear
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.fi
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In case the RaidLV should be converted to striped:
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.nf
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# lvconvert --type striped tb/lv
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Unable to convert LV tb/lv from raid6_nr to striped.
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Converting tb/lv from raid6_nr is directly possible to the following layouts:
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raid6_nc
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raid6_zr
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raid6_la_6
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raid6_ls_6
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raid6_ra_6
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raid6_rs_6
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raid6_n_6
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# lvconvert --type raid6_n_6
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Using default stripesize 64.00 KiB.
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Converting raid6_nr LV tb/lv to raid6_n_6.
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Are you sure you want to convert raid6_nr LV tb/lv? [y/n]: y
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Logical volume tb/lv successfully converted.
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# lvconvert -y --type striped tb/lv
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Logical volume tb/lv successfully converted.
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[root@vm46 ~]# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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LV Attr Type PE Ranges DOff
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lv -wi-a----- striped /dev/sda:2-32 /dev/sdaa:2-32 /dev/sdab:2-32 /dev/sdac:3-33
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lv -wi-a----- striped /dev/sda:34-35 /dev/sdaa:34-35 /dev/sdab:34-35 /dev/sdac:34-35
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.fi
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From striped we can convert to raid10
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.nf
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# lvconvert -y --type raid10 tb/lv
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Using default stripesize 64.00 KiB.
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Logical volume tb/lv successfully converted.
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# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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LV Attr Type PE Ranges DOff
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lv rwi-a-r--- raid10 lv_rimage_0:0-32 lv_rimage_4:0-32 lv_rimage_1:0-32 lv_rimage_5:0-32 lv_rimage_2:0-32 lv_rimage_6:0-32 lv_rimage_3:0-32 lv_rimage_7:0-32 0
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# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
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WARNING: Cannot find matching striped segment for tb/lv_rimage_3.
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LV Attr Type PE Ranges DOff
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lv rwi-a-r--- raid10 lv_rimage_0:0-32 lv_rimage_4:0-32 lv_rimage_1:0-32 lv_rimage_5:0-32 lv_rimage_2:0-32 lv_rimage_6:0-32 lv_rimage_3:0-32 lv_rimage_7:0-32 0
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[lv_rimage_0] iwi-aor--- linear /dev/sda:2-32 0
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[lv_rimage_0] iwi-aor--- linear /dev/sda:34-35
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[lv_rimage_1] iwi-aor--- linear /dev/sdaa:2-32 0
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[lv_rimage_1] iwi-aor--- linear /dev/sdaa:34-35
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[lv_rimage_2] iwi-aor--- linear /dev/sdab:2-32 0
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[lv_rimage_2] iwi-aor--- linear /dev/sdab:34-35
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[lv_rimage_3] iwi-XXr--- linear /dev/sdac:3-35 0
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[lv_rimage_4] iwi-aor--- linear /dev/sdad:1-33 0
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[lv_rimage_5] iwi-aor--- linear /dev/sdae:1-33 0
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[lv_rimage_6] iwi-aor--- linear /dev/sdaf:1-33 0
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[lv_rimage_7] iwi-aor--- linear /dev/sdag:1-33 0
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[lv_rmeta_0] ewi-aor--- linear /dev/sda:0-0
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[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:0-0
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[lv_rmeta_2] ewi-aor--- linear /dev/sdab:0-0
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[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
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[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
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[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
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[lv_rmeta_6] ewi-aor--- linear /dev/sdaf:0-0
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[lv_rmeta_7] ewi-aor--- linear /dev/sdag:0-0
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.fi
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raid10 allows to add stripes but can't remove them.
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..
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.SH RAID5 Variants
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