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man: add more examples to lvmraid(7)

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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 2017-03-09 22:26:22 +01:00
parent 1ba11aa7ee
commit d2aae8cff4
1 changed files with 241 additions and 9 deletions
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man/lvmraid.7.in
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@ -351,7 +351,7 @@ Also, if mismatches were found, the lvs attr field will display the letter
.nf
# lvs -o name,vgname,segtype,attr vg/lvol0
LV VG Type Attr
lvol0 vg raid1 Rwi-a-r-m-
lvol0 vg raid1 Rwi-a-r-m-
.fi
@ -475,12 +475,12 @@ lvs -a -o name,segtype,devices
lvr5 raid5 lvr5_rimage_0(0),\\
lvr5_rimage_1(0),\\
lvr5_rimage_2(0)
[lvr5_rimage_0] linear /dev/sda(...)
[lvr5_rimage_1] linear /dev/sdb(...)
[lvr5_rimage_2] linear /dev/sdc(...)
[lvr5_rmeta_0] linear /dev/sda(...)
[lvr5_rmeta_1] linear /dev/sdb(...)
[lvr5_rmeta_2] linear /dev/sdc(...)
[lvr5_rimage_0] linear /dev/sda(...)
[lvr5_rimage_1] linear /dev/sdb(...)
[lvr5_rimage_2] linear /dev/sdc(...)
[lvr5_rmeta_0] linear /dev/sda(...)
[lvr5_rmeta_1] linear /dev/sdb(...)
[lvr5_rmeta_2] linear /dev/sdc(...)
.fi
.B raid6
@ -1031,7 +1031,7 @@ for out-of-place reshaping. The result is:
.nf
# lvs -a -o lv_name,segtype,seg_pe_ranges,dataoffset
LV Type PE Ranges Doff
LV Type PE Ranges DOff
lv raid6_nr lv_rimage_0:0-32 \\
lv_rimage_1:0-32 \\
lv_rimage_2:0-32 \\
@ -1051,6 +1051,238 @@ for out-of-place reshaping. The result is:
All segments with PE ranges '33-33' provide the out-of-place reshape space.
The dataoffset column shows that the data was moved from initial offset 0 to
2048 sectors on each component DataLV.
If the RaidLV should be restriped for performance reasons,
convert the 3-way striped raid6_nr LV to 5-way-striped.
.nf
# lvconvert --stripes 5 -y tb/lv
Using default stripesize 64.00 KiB.
WARNING: Adding stripes to active logical volume tb/lv will grow it from 99 to 165 extents!
Run "lvresize -l99 tb/lv" to shrink it or use the additional capacity.
Logical volume tb/lv successfully converted.
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root fedora -wi-ao---- 15.00g
swap fedora -wi-ao---- 3.99g
lv tb rwi-a-r-s- 652.00m 52.94
# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
LV Attr Type PE Ranges DOff
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
[lv_rimage_0] iwi-aor--- linear /dev/sda:0-32 0
[lv_rimage_0] iwi-aor--- linear /dev/sda:34-34
[lv_rimage_1] iwi-aor--- linear /dev/sdaa:0-32 0
[lv_rimage_1] iwi-aor--- linear /dev/sdaa:34-34
[lv_rimage_2] iwi-aor--- linear /dev/sdab:0-32 0
[lv_rimage_2] iwi-aor--- linear /dev/sdab:34-34
[lv_rimage_3] iwi-aor--- linear /dev/sdac:1-34 0
[lv_rimage_4] iwi-aor--- linear /dev/sdad:1-34 0
[lv_rimage_5] iwi-aor--- linear /dev/sdae:1-34 0
[lv_rimage_6] iwi-aor--- linear /dev/sdaf:1-34 0
[lv_rmeta_0] ewi-aor--- linear /dev/sda:33-33
[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:33-33
[lv_rmeta_2] ewi-aor--- linear /dev/sdab:33-33
[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
[lv_rmeta_6] ewi-aor--- linear /dev/sdaf:0-0
.fi
Convert the 5-way striped raid6_nr LV to 4-way-striped.
The force option needs to be used, because removing stripes
(i.e. image SubLVs) from a RaidLV will shrink its size.
.nf
# lvconvert --stripes 4 --force -y tb/lv
Using default stripesize 64.00 KiB.
WARNING: Removing stripes from active logical volume tb/lv will shrink it from 660.00 MiB to 528.00 MiB!
THIS MAY DESTROY (PARTS OF) YOUR DATA!
If that leaves the logical volume larger than 206 extents due to stripe rounding,
you may want to grow the content afterwards (filesystem etc.)
WARNING: too remove freed stripes after the conversion has finished, you have to run "lvconvert --stripes 4 tb/lv"
Logical volume tb/lv successfully converted.
# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
LV Attr Type PE Ranges DOff
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
[lv_rimage_0] Iwi-aor--- linear /dev/sda:0-32 0
[lv_rimage_0] Iwi-aor--- linear /dev/sda:34-34
[lv_rimage_1] Iwi-aor--- linear /dev/sdaa:0-32 0
[lv_rimage_1] Iwi-aor--- linear /dev/sdaa:34-34
[lv_rimage_2] Iwi-aor--- linear /dev/sdab:0-32 0
[lv_rimage_2] Iwi-aor--- linear /dev/sdab:34-34
[lv_rimage_3] Iwi-aor--- linear /dev/sdac:1-34 0
[lv_rimage_4] Iwi-aor--- linear /dev/sdad:1-34 0
[lv_rimage_5] Iwi-aor--- linear /dev/sdae:1-34 0
[lv_rimage_6] Iwi-aor-R- linear /dev/sdaf:1-34 0
[lv_rmeta_0] ewi-aor--- linear /dev/sda:33-33
[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:33-33
[lv_rmeta_2] ewi-aor--- linear /dev/sdab:33-33
[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
[lv_rmeta_6] ewi-aor-R- linear /dev/sdaf:0-0
.fi
The 's' in column 9 of the attribute field shows the RaidLV is still reshaping.
The 'R' in the same column of the attribute field shows the freed image Sub LVs which will need removing once the reshaping finished.
.nf
# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
LV Attr Type PE Ranges DOff
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
.fi
Now that the reshape is finished the 'R' atribute on the RaidLV shows images can be removed.
.nf
# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
LV Attr Type PE Ranges DOff
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
.fi
This is achieved by repeating the command ("lvconvert --stripes 4 tb/lv" would be sufficient).
.nf
# lvconvert --stripes 4 --force -y tb/lv
Using default stripesize 64.00 KiB.
Logical volume tb/lv successfully converted.
# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
LV Attr Type PE Ranges DOff
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
[lv_rimage_0] iwi-aor--- linear /dev/sda:0-32 8192
[lv_rimage_0] iwi-aor--- linear /dev/sda:34-34
[lv_rimage_1] iwi-aor--- linear /dev/sdaa:0-32 8192
[lv_rimage_1] iwi-aor--- linear /dev/sdaa:34-34
[lv_rimage_2] iwi-aor--- linear /dev/sdab:0-32 8192
[lv_rimage_2] iwi-aor--- linear /dev/sdab:34-34
[lv_rimage_3] iwi-aor--- linear /dev/sdac:1-34 8192
[lv_rimage_4] iwi-aor--- linear /dev/sdad:1-34 8192
[lv_rimage_5] iwi-aor--- linear /dev/sdae:1-34 8192
[lv_rmeta_0] ewi-aor--- linear /dev/sda:33-33
[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:33-33
[lv_rmeta_2] ewi-aor--- linear /dev/sdab:33-33
[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
# lvs -a -o lv_name,attr,segtype,reshapelen tb
LV Attr Type RSize
lv rwi-a-r--- raid6_nr 24.00m
[lv_rimage_0] iwi-aor--- linear 4.00m
[lv_rimage_0] iwi-aor--- linear
[lv_rimage_1] iwi-aor--- linear 4.00m
[lv_rimage_1] iwi-aor--- linear
[lv_rimage_2] iwi-aor--- linear 4.00m
[lv_rimage_2] iwi-aor--- linear
[lv_rimage_3] iwi-aor--- linear 4.00m
[lv_rimage_4] iwi-aor--- linear 4.00m
[lv_rimage_5] iwi-aor--- linear 4.00m
[lv_rmeta_0] ewi-aor--- linear
[lv_rmeta_1] ewi-aor--- linear
[lv_rmeta_2] ewi-aor--- linear
[lv_rmeta_3] ewi-aor--- linear
[lv_rmeta_4] ewi-aor--- linear
[lv_rmeta_5] ewi-aor--- linear
.fi
If the reshape space shall be removed any lvconvert command not changing the layout can be used:
.nf
# lvconvert --stripes 4 tb/lv
Using default stripesize 64.00 KiB.
No change in RAID LV tb/lv layout, freeing reshape space.
Logical volume tb/lv successfully converted.
# lvs -a -o lv_name,attr,segtype,reshapelen tb
LV Attr Type RSize
lv rwi-a-r--- raid6_nr 0
[lv_rimage_0] iwi-aor--- linear 0
[lv_rimage_0] iwi-aor--- linear
[lv_rimage_1] iwi-aor--- linear 0
[lv_rimage_1] iwi-aor--- linear
[lv_rimage_2] iwi-aor--- linear 0
[lv_rimage_2] iwi-aor--- linear
[lv_rimage_3] iwi-aor--- linear 0
[lv_rimage_4] iwi-aor--- linear 0
[lv_rimage_5] iwi-aor--- linear 0
[lv_rmeta_0] ewi-aor--- linear
[lv_rmeta_1] ewi-aor--- linear
[lv_rmeta_2] ewi-aor--- linear
[lv_rmeta_3] ewi-aor--- linear
[lv_rmeta_4] ewi-aor--- linear
[lv_rmeta_5] ewi-aor--- linear
.fi
In case the RaidLV should be converted to striped:
.nf
# lvconvert --type striped tb/lv
Unable to convert LV tb/lv from raid6_nr to striped.
Converting tb/lv from raid6_nr is directly possible to the following layouts:
raid6_nc
raid6_zr
raid6_la_6
raid6_ls_6
raid6_ra_6
raid6_rs_6
raid6_n_6
# lvconvert --type raid6_n_6
Using default stripesize 64.00 KiB.
Converting raid6_nr LV tb/lv to raid6_n_6.
Are you sure you want to convert raid6_nr LV tb/lv? [y/n]: y
Logical volume tb/lv successfully converted.
# lvconvert -y --type striped tb/lv
Logical volume tb/lv successfully converted.
[root@vm46 ~]# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
LV Attr Type PE Ranges DOff
lv -wi-a----- striped /dev/sda:2-32 /dev/sdaa:2-32 /dev/sdab:2-32 /dev/sdac:3-33
lv -wi-a----- striped /dev/sda:34-35 /dev/sdaa:34-35 /dev/sdab:34-35 /dev/sdac:34-35
.fi
From striped we can convert to raid10
.nf
# lvconvert -y --type raid10 tb/lv
Using default stripesize 64.00 KiB.
Logical volume tb/lv successfully converted.
# lvs -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
LV Attr Type PE Ranges DOff
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
# lvs -a -o lv_name,attr,segtype,seg_pe_ranges,dataoffset tb
WARNING: Cannot find matching striped segment for tb/lv_rimage_3.
LV Attr Type PE Ranges DOff
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
[lv_rimage_0] iwi-aor--- linear /dev/sda:2-32 0
[lv_rimage_0] iwi-aor--- linear /dev/sda:34-35
[lv_rimage_1] iwi-aor--- linear /dev/sdaa:2-32 0
[lv_rimage_1] iwi-aor--- linear /dev/sdaa:34-35
[lv_rimage_2] iwi-aor--- linear /dev/sdab:2-32 0
[lv_rimage_2] iwi-aor--- linear /dev/sdab:34-35
[lv_rimage_3] iwi-XXr--- linear /dev/sdac:3-35 0
[lv_rimage_4] iwi-aor--- linear /dev/sdad:1-33 0
[lv_rimage_5] iwi-aor--- linear /dev/sdae:1-33 0
[lv_rimage_6] iwi-aor--- linear /dev/sdaf:1-33 0
[lv_rimage_7] iwi-aor--- linear /dev/sdag:1-33 0
[lv_rmeta_0] ewi-aor--- linear /dev/sda:0-0
[lv_rmeta_1] ewi-aor--- linear /dev/sdaa:0-0
[lv_rmeta_2] ewi-aor--- linear /dev/sdab:0-0
[lv_rmeta_3] ewi-aor--- linear /dev/sdac:0-0
[lv_rmeta_4] ewi-aor--- linear /dev/sdad:0-0
[lv_rmeta_5] ewi-aor--- linear /dev/sdae:0-0
[lv_rmeta_6] ewi-aor--- linear /dev/sdaf:0-0
[lv_rmeta_7] ewi-aor--- linear /dev/sdag:0-0
.fi
raid10 allows to add stripes but can't remove them.
..
.SH RAID5 Variants
@ -1243,7 +1475,7 @@ The command to start duplication is:
.B \-\-duplicate
.br
Specifies that the LV conversion should be done out\-of\-place, copying
LV data to new devices while converting.
LV data to new devices while converting.
.HP
.BR \-\-type , \-\-stripes , \-\-stripesize