What's 8e ? - Logical Volume Manager (LVM) Chapter

Hi, I cannot understand what's 8e in the next instruction:
"For example, assuming you have already created partitions /dev/sdb1 and /dev/sdc1 and given them type 8e"
What's "8e"? the next 8 commands to execute? a type of partition? I don't understand...
Another question is about the gvcreate command, What exactly the "physicalextensivesize" that we specified as param in this command:
sudo vgcreate -s 16M vg /dev/sdb1
It's necessary to specify this param for creating a group volume?
Thanks!
Comments
-
Hi Nicolas.
Yes, in my understanding, 8e is a partition type of a Linux LVM, named "Linux LVM". Where for example, the standard Linux partition type is type 83, called "Linux". This is for actual physical drives. Check out $sudo fdisk -l and you will see something like this:
Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 1953791 1951744 953M 83 Linux /dev/sda2 1953792 629143551 627189760 299.1G 83 Linux
Again, this is for the actual physical hard drives, before you start dealing with LVM.
1 -
to see the types possible you can run fdisk, then say "t" to change a type, it will ask a partition number and then you type "L" to see a list. Make sure you say q when done so you quit without a change. Note that in my experience the partition type seems to be ignored pretty much in Linux -- the operating system examines the partition to see what it is all the time anyway.
I assume you meant vgcreate not gvcreate. If you don't specify the size of an extent with the -s parameter, you get get 4MB extents. The extent size is the chunk that the lvm is broken up into. A 1 GB file, for example, would that 256 extents.
The bigger the extent size, the less fragmented the LVM would be but the less efficient it might be for moving things around and filling holes. I don' t know particularly good arguments for modifying the extent size from default but they probably exist. For SSD's fragmentation doesn't matter the way it does for physical hard drives.3 -
Thanks, @coop . It looks like I was a little tired after some hours of study, but I'm back later, and I did understand.
Thanks for your time and response.0 -
Thanks @faszikam
0 -
-
Thanks@robbnl
0 -
if the device has a GPT partition table it's not '8e' for lvm and it's not 'fd' for raid, instead it's 31 and 29. This should be mentioned somewhere or changed, because imho MBR is in the process of dying.
1 -
Hi @rhin , what tool are you using? Can't find codes 29 and 31 on fdisk or gdisk. Please provide more details.
Thanks,
Luis.0 -
29 Linux RAID A19D880F-05FC-4D3B-A006-743F0F84911E
30 Linux extended boot BC13C2FF-59E6-4262-A352-B275FD6F7172
31 Linux LVM E6D6D379-F507-44C2-A23C-238F2A3DF9
in fdisk on my laptop.I cannot research this right now, but on Linux the Type is ignored completely everywhere I have ever looked as the type is determined by analysis at run time by every utility including mount I often forget to even set the type as it is irrelevant. So in effect, this is curious but pedantic.
1 -
@luisviveropena said:
Hi @rhin , what tool are you using? Can't find codes 29 and 31 on fdisk or gdisk. Please provide more details.Thanks,
Luis.It's just fdisk on my Ubuntu box.
❯ uname -a
Linux blackbox 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linuxbut it's the same (29 & 31) on my Debian VPS:
rh@elysium:~$ uname -a
Linux elysium 4.19.0-12-amd64 #1 SMP Debian 4.19.152-1 (2020-10-18) x86_64 GNU/Linux0
Categories
- All Categories
- 50 LFX Mentorship
- 103 LFX Mentorship: Linux Kernel
- 553 Linux Foundation Boot Camps
- 296 Cloud Engineer Boot Camp
- 119 Advanced Cloud Engineer Boot Camp
- 52 DevOps Engineer Boot Camp
- 53 Cloud Native Developer Boot Camp
- 4 Express Training Courses
- 4 Express Courses - Discussion Forum
- 1.9K Training Courses
- 18 LFC110 Class Forum
- 6 LFC131 Class Forum
- 25 LFD102 Class Forum
- 150 LFD103 Class Forum
- 17 LFD121 Class Forum
- LFD137 Class Forum
- 61 LFD201 Class Forum
- LFD210 Class Forum
- LFD210-CN Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- LFD237 Class Forum
- 23 LFD254 Class Forum
- 598 LFD259 Class Forum
- 102 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- LFD273 Class Forum
- 2 LFS145 Class Forum
- 24 LFS200 Class Forum
- 739 LFS201 Class Forum
- 1 LFS201-JP クラス フォーラム
- 3 LFS203 Class Forum
- 69 LFS207 Class Forum
- 300 LFS211 Class Forum
- 54 LFS216 Class Forum
- 47 LFS241 Class Forum
- 41 LFS242 Class Forum
- 37 LFS243 Class Forum
- 11 LFS244 Class Forum
- 34 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 140 LFS253 Class Forum
- LFS254 Class Forum
- 1K LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 92 LFS260 Class Forum
- 130 LFS261 Class Forum
- 32 LFS262 Class Forum
- 79 LFS263 Class Forum
- 15 LFS264 Class Forum
- 11 LFS266 Class Forum
- 17 LFS267 Class Forum
- 17 LFS268 Class Forum
- 23 LFS269 Class Forum
- 203 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS281 Class Forum
- 221 LFW211 Class Forum
- 167 LFW212 Class Forum
- SKF100 Class Forum
- 902 Hardware
- 219 Drivers
- 74 I/O Devices
- 44 Monitors
- 115 Multimedia
- 209 Networking
- 101 Printers & Scanners
- 85 Storage
- 761 Linux Distributions
- 88 Debian
- 66 Fedora
- 15 Linux Mint
- 13 Mageia
- 24 openSUSE
- 141 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 356 Ubuntu
- 477 Linux System Administration
- 41 Cloud Computing
- 69 Command Line/Scripting
- Github systems admin projects
- 95 Linux Security
- 77 Network Management
- 108 System Management
- 49 Web Management
- 66 Mobile Computing
- 23 Android
- 29 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 536 Off Topic
- 131 Introductions
- 216 Small Talk
- 21 Study Material
- 817 Programming and Development
- 275 Kernel Development
- 508 Software Development
- 928 Software
- 260 Applications
- 184 Command Line
- 3 Compiling/Installing
- 76 Games
- 316 Installation
- 59 All In Program
- 59 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)