Gentoo Archives: gentoo-user

From: Dale <rdalek1967@×××××.com>
To: gentoo-user@l.g.o
Subject: [gentoo-user] LVM and moving drive to another sata port.
Date: Fri, 14 Dec 2018 14:14:12
1 Howdy,
3 I'm getting closer to swapping out a hard drive in one of my LVM
4 groups.  It has two drives in it.  They are sdc and sdd as shown below. 
7 --- Physical volume ---
8   PV Name               /dev/sdc1
9   VG Name               Home2
10   PV Size               2.73 TiB / not usable 3.44 MiB
11   Allocatable           yes (but full)
12   PE Size               4.00 MiB
13   Total PE              715396
14   Free PE               0
15   Allocated PE          715396
16   PV UUID               ki26nc-pgTs-PCx9-qPBQ-RJNd-5Rd7-aj8sR4
18   --- Physical volume ---
19   PV Name               /dev/sdd1
20   VG Name               Home2
21   PV Size               2.73 TiB / not usable 3.44 MiB
22   Allocatable           yes (but full)
23   PE Size               4.00 MiB
24   Total PE              715396
25   Free PE               0
26   Allocated PE          715396
27   PV UUID               vg4f2b-1d6N-61hF-Adl7-0wzf-nxn6-Ol5ybJ
31 I'm planning to change some connections while swapping and wanted to be
32 sure of something before I do any moves like this.  Let's say I move sdc
33 and it becomes sdb.  Will LVM still see it the same way?  I suspect it
34 tracks the drive by the UUID which stays the same no matter what port or
35 sd letter it gets BUT I want to be sure.  I've drawn out a diagram of
36 how the drives are currently connected so I could go back if needed but
37 still want to rearrange things.  Am I correct that changing what drive
38 connects to what sata port won't matter to LVM and how it sees them? 
39 Also, what if I connect one to the PCIe card I have?  Will it still see
40 it the same way? 
42 Also, I found a wonderful guide for my upcoming move.  It is located here:
46 Scroll down a bit to:  13.5.2. Distributing Old Extents to a New
47 Replacement Disk
49 That covers exactly what I am doing.  Even tho Grant and others say it
50 is that easy, I still find it hard to believe.  O_0  I sure am glad I
51 was talked into using LVM.  I think it was Alan that first mentioned it
52 but not sure. 
54 Thanks much. 
56 Dale
58 :-)  :-) 
60 P. S.  I'm still copying over my /home to the new 8TB backup drive. 
61 While it is copying at speeds of 20MBs/sec for some files to as high as
62 160MBs/sec for other files, it takes a long time with that much data. 
63 It is running at a much better speed than it was when I started the
64 other thread. 


Subject Author
Re: [gentoo-user] LVM and moving drive to another sata port. Rich Freeman <rich0@g.o>