I am planning to increase the disk space on my desktop system. It is
running CentOS 5.9 w/XEN. I have two 160Gig 2.5" laptop (2.5") SATA drives
in two slots of a 4-slot hot swap bay configured like this:
Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 125 1004031 fd Linux raid autodetect
/dev/sda2 126 19457 155284290 fd Linux raid autodetect
Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 125 1004031 fd Linux raid autodetect
/dev/sdb2 126 19457 155284290 fd Linux raid autodetect
sauron.deepsoft.com% cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
1003904 blocks [2/2] [UU]
md1 : active raid1 sdb2[1] sda2[0]
155284224 blocks [2/2] [UU]
unused devices: <none>
That is I have two RAID1 arrays: a small (1Gig) one mounted as /boot
and a larger 148Gig one that is a LVM Volume Group (which contains a
pile of file systems, some for DOM0 and some that are for other VMs).
What I plan on doing is getting a pair of 320Gig 2.5" (laptop) SATA
disks and fail over the existing disks to this new pair. I believe I
can then 'grow' the second RAID array to be like ~300Gig. My question
is: what happens to the LVM Volume Group? Will it grow when the RAID
array grows? Or should I leave /dev/md1 its current size and create a
new RAID array and add this as a second PV and grow the Volume Group
that way? The documentation is not clear as to what happens -- the VG
is marked 'resisable'.
sauron.deepsoft.com% sudo pvdisplay
--- Physical volume ---
PV Name /dev/md1
VG Name sauron
PV Size 148.09 GB / not usable 768.00 KB
Allocatable yes
PE Size (KByte) 4096
Total PE 37911
Free PE 204
Allocated PE 37707
PV UUID ttB15B-3eWx-4ioj-TUvm-lAPM-z9rD-Prumee
sauron.deepsoft.com% sudo vgdisplay
--- Volume group ---
VG Name sauron
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 65
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 17
Open LV 12
Max PV 0
Cur PV 1
Act PV 1
VG Size 148.09 GB
PE Size 4.00 MB
Total PE 37911
Alloc PE / Size 37707 / 147.29 GB
Free PE / Size 204 / 816.00 MB
VG UUID qG8gCf-3vou-7dp2-Ar0B-p8jz-eXZF-3vOONr
--
Robert Heller -- 978-544-6933 / heller@xxxxxxxxxxxx
Deepwoods Software -- http://www.deepsoft.com/
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