Re: raid 5 : partitioned array VS lvm
Alex Samad <alex <at> samad.com.au> writes:
> > Lately I tried some different configurations (lvm & partition) to divide
> > my raid
> > 5 array.
> you might want to check out http://www.miracleas.com/BAARF/BAARF2.html talks
> about why you might not want to use raid5 in this config and maybe raid1/0
Thank you for the information. I read few articles but I'm not a company, and
raid1/0 is too expensive for me.
Anyway, it does not explain why there is so much performance differences between
lvm and partitioned array.
Here is some additional information :
# pvdisplay
--- Physical volume ---
PV Name /dev/md0
VG Name raidvol1
PV Size 1,34 TB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 65536
Total PE 21908
Free PE 0
Allocated PE 21908
# vgdisplay
--- Volume group ---
VG Name raidvol1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 11
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 1,34 TB
PE Size 64,00 MB
Total PE 21908
Alloc PE / Size 21908 / 1,34 TB
Free PE / Size 0 / 0
# lvdisplay
--- Logical volume ---
LV Name /dev/raidvol1/data1
VG Name raidvol1
LV Write Access read/write
LV Status available
# open 1
LV Size 849,25 GB
Current LE 13588
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0
--- Logical volume ---
LV Name /dev/raidvol1/data2
VG Name raidvol1
LV Write Access read/write
LV Status available
# open 1
LV Size 500,00 GB
Current LE 8000
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1
--- Logical volume ---
LV Name /dev/raidvol1/home1
VG Name raidvol1
LV Write Access read/write
LV Status available
# open 1
LV Size 20,00 GB
Current LE 320
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:2
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