Problem with Linear RAID array and available space

phil_r

Guys... I've got a 20Gb sdb and a 40Gb sdc. Look at the outputs...

[root@gateway p2p]# pvdisplay
--- Physical volume ---
PV Name /dev/sdb1
VG Name Group
PV Size 18.64 GB / not usable 18.00 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 596
Free PE 0
Allocated PE 596
PV UUID eoExzx-vPaY-1YXS-yn6x-JXHu-m5QY-xkruaJ

--- Physical volume ---
PV Name /dev/sdc1
VG Name Group
PV Size 38.29 GB / not usable 5.47 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 1225
Free PE 0
Allocated PE 1225
PV UUID PhT69Y-fBoe-KsL8-Pu85-F6Oh-BspT-mjlsNM

[root@gateway p2p]# vgdisplay
--- Volume group ---
VG Name Group
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 10
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size 56.91 GB
PE Size 32.00 MB
Total PE 1821
Alloc PE / Size 1821 / 56.91 GB
Free PE / Size 0 / 0
VG UUID 4O0OBl-XABb-FY4R-Vs2D-4Mr0-ZaC0-DluSzV

[root@gateway p2p]# lvdisplay
--- Logical volume ---
LV Name /dev/Group/array
VG Name Group
LV UUID iaKr2k-oTUp-h0dX-iETk-F2WE-cPa2-Bxdg4t
LV Write Access read/write
LV Status available
# open 1
LV Size 56.91 GB
Current LE 1821
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 253:0

Ok so a 56Gb array, at /dev/Group/array. When I mount as /home:-
/dev/mapper/Group-array
19G 7.5G 10G 43% /home

WTF? Looks like only sdb1 is being mounted and sdc is ignored. Any ideas why?
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eccerr0r · Posted: Thu Aug 30, 2007 12:42 am Post subject:

did you create the logical volume before adding the new physical volume /dev/sdc1?
After growing the logical volume to cover /dev/sdc1 you'll need to resize the formatting of the partition, check out ext2resize or the analog for the filesystem you're using. Not all filesystems can be grown/shrunk/...
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phil_r · Posted: Thu Aug 30, 2007 2:12 am Post subject:

Yeah I did - never occurred to me to resize the partition - I thought the lvresize command took care of that. Now that you mention it that makes sense... I'll do that and report back.
_________________
Just when you think you know the answers, I change the questions.

eccerr0r · Posted: Fri Aug 31, 2007 9:17 pm Post subject:

Just wanted to report, recently I tried resizing a partition on RAID5-LVM and it failed. I could not get the newly resized partition to fsck properly. Thank goodness I thought of backing up the array to another array, so I just recreated the filesystem and copied everything back. Always backup before resizing!!!
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching?