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Server :: Differentiating Volume Groups - New RAID


I'm experimenting on a new 5.7TB raid we got for one of our servers before it goes into production. I'm carving the space up into Volume Groups and Logical Volumes. Below is some sample output:

[root@server newhome]# vgdisplay
--- Volume group ---
VG Name extraid_sdd1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 1.82 TB
PE Size 4.00 MB
Total PE 476804
Alloc PE / Size 476804 / 1.82 TB
Free PE / Size 0 / 0
VG UUID LJPJVE-fekS-crS8-uugk-l13z-0NG0-FWv3M3

--- Volume group --
VG Name extraid_sdb1
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
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 3.64 TB
PE Size 4.00 MB
Total PE 953608
Alloc PE / Size 953608 / 3.64 TB
Free PE / Size 0 / 0
VG UUID kzlLN4-PyrX-LYUS-h1Tc-1S9F-jVV0-XU5tcK

Because I created this, I know that the second 3.64tb Volume Group, extraid_sdb1, is composed of two physical volumes, /dev/sdb1 and /dev/sdc1, each one 1.82TB in size. My question is, if I hadn't made this and had to work backward, how could I discover that info? I can see that the second VG is composed of 2 PVs by the "Cur PV" line. But if I didn't know that they are my /dev/sdb1 and /dev/sdc1, how could I break that out, as well as their sizes? If it matters, this system is running FC6.


View 1 Replies (Posted: 07-01-2009, 12:50 PM)

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ERROR: ddf1: wrong # of devices in RAID set "ddf1_Series1" [1/2] on /dev/sdb No volume groups found

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md6 : active raid1 sdi1[1] sdf1[0]
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Posted: July 2nd, 2011

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I've been using LVMs on some of my Linux servers for years without fully "getting" them. Doing a lot of things by rote. As I setup a new RAID though, I realize I don't have to be so rigid. I inherited a mission critical server with five independent disks

Code:
/dev/sdb1 /usr1
/dev/sdc1 /usr2
/dev/sdd1 /usr3
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I've bought an external RAID5 box that I plan to migrate the data to and was planning on this layout.

Code:
Method 1
VGLogVol
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Code:
Method 2
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Posted: 04-28-2009, 11:42 AM

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Code:
# pvdisplay
--- Physical volume ---
PV Name /dev/sda9
VG Name myVG1
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PE Size (KByte) 4096
Total PE 13
Free PE 11
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This is how I am creating a Logical Group out of the above Physical Volume:

Code:
# vgcreate myVG1 -s 4m /dev/sda9
Display:

Code:
# vgdisplay
--- Volume group ---
VG Name myVG1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
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But I am unable to create one more Logical Group out of this Physical Volume. Can we accomplish it? Or do we always extend our current Logical Group to utilize the available space of a Physical Volume?

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[code]...

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[Code].....

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[Code]...

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Code:
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[code]....

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