Is a disk without being partitioned a partition by itself?
From We can make a disk a PV by `pvcreate`, if and only if the disk has only one partition?
You can't make the whole disk a PV if there is at least one partition on it (because pvcreate won't let you).
When considering disks and partitions as concepts in operating systems, is it correct that a disk without being partitioned is a partition by itself?
If no, what is the difference between a disk without being partitioned and a disk with only one partition?
Can pvcreate mark a disk with only one partition as a PV?
partition lvm
asked Feb 24 at 16:41
TimTim
27.8k78265485
add a comment |
From We can make a disk a PV by `pvcreate`, if and only if the disk has only one partition?
You can't make the whole disk a PV if there is at least one partition on it (because pvcreate won't let you).
When considering disks and partitions as concepts in operating systems, is it correct that a disk without being partitioned is a partition by itself?
If no, what is the difference between a disk without being partitioned and a disk with only one partition?
Can pvcreate mark a disk with only one partition as a PV?
partition lvm
asked Feb 24 at 16:41
TimTim
27.8k78265485
1
Partitions exist when defined by a partition table. For this reason I wouldn't consider a disk to be a partition
– Torin
Feb 24 at 16:52
add a comment |
From We can make a disk a PV by `pvcreate`, if and only if the disk has only one partition?
You can't make the whole disk a PV if there is at least one partition on it (because pvcreate won't let you).
When considering disks and partitions as concepts in operating systems, is it correct that a disk without being partitioned is a partition by itself?
If no, what is the difference between a disk without being partitioned and a disk with only one partition?
Can pvcreate mark a disk with only one partition as a PV?
partition lvm
asked Feb 24 at 16:41
TimTim
27.8k78265485
From We can make a disk a PV by `pvcreate`, if and only if the disk has only one partition?
You can't make the whole disk a PV if there is at least one partition on it (because pvcreate won't let you).
When considering disks and partitions as concepts in operating systems, is it correct that a disk without being partitioned is a partition by itself?
If no, what is the difference between a disk without being partitioned and a disk with only one partition?
Can pvcreate mark a disk with only one partition as a PV?
partition lvm
partition lvm
asked Feb 24 at 16:41
TimTim
27.8k78265485
asked Feb 24 at 16:41
TimTim
27.8k78265485
asked Feb 24 at 16:41
TimTim
27.8k78265485
asked Feb 24 at 16:41
TimTim
27.8k78265485
asked Feb 24 at 16:41
TimTim
27.8k78265485
27.8k78265485
1
Partitions exist when defined by a partition table. For this reason I wouldn't consider a disk to be a partition
– Torin
Feb 24 at 16:52
add a comment |
1
Partitions exist when defined by a partition table. For this reason I wouldn't consider a disk to be a partition
– Torin
Feb 24 at 16:52
1
1
Partitions exist when defined by a partition table. For this reason I wouldn't consider a disk to be a partition
– Torin
Feb 24 at 16:52
Partitions exist when defined by a partition table. For this reason I wouldn't consider a disk to be a partition
– Torin
Feb 24 at 16:52
add a comment |
3 Answers
3
active
oldest
votes
A disk without being partitioned is a disk with no partitions or partition table; it’s not a partition (a partition separates something into parts, even if it’s only one; a whole disk isn’t separated into parts).
A disk with one partition is a disk with a partition table of some sort (there are several partitioning schemes), with one entry in the table defining a partition.
pvcreate can create a physical volume using an entire disk or a partition. By default it will refuse to create a physical volume using an entire disk if it already contains a partition table.
(Note that pvcreate doesn’t “mark” an existing feature — disk or partition —, it creates a physical volume, which involves writing metadata.)
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
Thanks. "By default it will refuse to create a physical volume using an entire disk if it already contains a partition table." What is non default case?
– Tim
Feb 24 at 18:06
-for-ffIIRC.
– Stephen Kitt
Feb 24 at 18:56
add a comment |
They are both block storage devices. In principle one could add a partition table to a partition, thus adding partitions to it. However Operating Systems may not recursively traverse partitions, so they may no be found, and thus may not be treated the same.
Note: Extended partitions are a partition with a partition table within.
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
partition table is more like a simple kernel built-in device-mapper solution. Pretty old, but still in common use.
– 炸鱼薯条德里克
Feb 25 at 1:06
@炸鱼薯条德里克 "partition table is more like a simple kernel built-in device-mapper solution." Is a partition table a mapping from what to what? Is LVM's device-mapper solution a mapping from what to what?
– Tim
Feb 26 at 4:28
from one physical disk to several partition block devices. from physical disks to LVs.@Tim
– 炸鱼薯条德里克
Feb 26 at 4:48
add a comment |
You can't make the whole disk a PV if there is at least one partition
on it (because pvcreate won't let you).
All this is saying is that pvcreate refuses to wipe out your partition table if one exists. The point of this is to prevent data loss if a user accidentally runs pvcreate /dev/sda.
If /dev/sda isn't partitioned you can run pvcreate /dev/sda to make the whole disk (even the area of the disk where a partition table would exist) a PV.
If /dev/sda is partitioned (e.g. MBR or GPT) pvcreate doesn't want to take a chance ("it won't let you"). This is a safety mechanism, not a technical limitation.
answered Feb 24 at 17:58
catanmancatanman
9612
add a comment |
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3 Answers
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active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
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A disk without being partitioned is a disk with no partitions or partition table; it’s not a partition (a partition separates something into parts, even if it’s only one; a whole disk isn’t separated into parts).
A disk with one partition is a disk with a partition table of some sort (there are several partitioning schemes), with one entry in the table defining a partition.
pvcreate can create a physical volume using an entire disk or a partition. By default it will refuse to create a physical volume using an entire disk if it already contains a partition table.
(Note that pvcreate doesn’t “mark” an existing feature — disk or partition —, it creates a physical volume, which involves writing metadata.)
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
Thanks. "By default it will refuse to create a physical volume using an entire disk if it already contains a partition table." What is non default case?
– Tim
Feb 24 at 18:06
-for-ffIIRC.
– Stephen Kitt
Feb 24 at 18:56
add a comment |
A disk without being partitioned is a disk with no partitions or partition table; it’s not a partition (a partition separates something into parts, even if it’s only one; a whole disk isn’t separated into parts).
A disk with one partition is a disk with a partition table of some sort (there are several partitioning schemes), with one entry in the table defining a partition.
pvcreate can create a physical volume using an entire disk or a partition. By default it will refuse to create a physical volume using an entire disk if it already contains a partition table.
(Note that pvcreate doesn’t “mark” an existing feature — disk or partition —, it creates a physical volume, which involves writing metadata.)
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
Thanks. "By default it will refuse to create a physical volume using an entire disk if it already contains a partition table." What is non default case?
– Tim
Feb 24 at 18:06
-for-ffIIRC.
– Stephen Kitt
Feb 24 at 18:56
add a comment |
A disk without being partitioned is a disk with no partitions or partition table; it’s not a partition (a partition separates something into parts, even if it’s only one; a whole disk isn’t separated into parts).
A disk with one partition is a disk with a partition table of some sort (there are several partitioning schemes), with one entry in the table defining a partition.
pvcreate can create a physical volume using an entire disk or a partition. By default it will refuse to create a physical volume using an entire disk if it already contains a partition table.
(Note that pvcreate doesn’t “mark” an existing feature — disk or partition —, it creates a physical volume, which involves writing metadata.)
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
A disk without being partitioned is a disk with no partitions or partition table; it’s not a partition (a partition separates something into parts, even if it’s only one; a whole disk isn’t separated into parts).
A disk with one partition is a disk with a partition table of some sort (there are several partitioning schemes), with one entry in the table defining a partition.
pvcreate can create a physical volume using an entire disk or a partition. By default it will refuse to create a physical volume using an entire disk if it already contains a partition table.
(Note that pvcreate doesn’t “mark” an existing feature — disk or partition —, it creates a physical volume, which involves writing metadata.)
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
answered Feb 24 at 17:04
Stephen KittStephen Kitt
176k24401479
176k24401479
Thanks. "By default it will refuse to create a physical volume using an entire disk if it already contains a partition table." What is non default case?
– Tim
Feb 24 at 18:06
-for-ffIIRC.
– Stephen Kitt
Feb 24 at 18:56
add a comment |
Thanks. "By default it will refuse to create a physical volume using an entire disk if it already contains a partition table." What is non default case?
– Tim
Feb 24 at 18:06
-for-ffIIRC.
– Stephen Kitt
Feb 24 at 18:56
Thanks. "By default it will refuse to create a physical volume using an entire disk if it already contains a partition table." What is non default case?
– Tim
Feb 24 at 18:06
Thanks. "By default it will refuse to create a physical volume using an entire disk if it already contains a partition table." What is non default case?
– Tim
Feb 24 at 18:06
-f or -ff IIRC.– Stephen Kitt
Feb 24 at 18:56
-f or -ff IIRC.– Stephen Kitt
Feb 24 at 18:56
add a comment |
They are both block storage devices. In principle one could add a partition table to a partition, thus adding partitions to it. However Operating Systems may not recursively traverse partitions, so they may no be found, and thus may not be treated the same.
Note: Extended partitions are a partition with a partition table within.
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
partition table is more like a simple kernel built-in device-mapper solution. Pretty old, but still in common use.
– 炸鱼薯条德里克
Feb 25 at 1:06
@炸鱼薯条德里克 "partition table is more like a simple kernel built-in device-mapper solution." Is a partition table a mapping from what to what? Is LVM's device-mapper solution a mapping from what to what?
– Tim
Feb 26 at 4:28
from one physical disk to several partition block devices. from physical disks to LVs.@Tim
– 炸鱼薯条德里克
Feb 26 at 4:48
add a comment |
They are both block storage devices. In principle one could add a partition table to a partition, thus adding partitions to it. However Operating Systems may not recursively traverse partitions, so they may no be found, and thus may not be treated the same.
Note: Extended partitions are a partition with a partition table within.
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
partition table is more like a simple kernel built-in device-mapper solution. Pretty old, but still in common use.
– 炸鱼薯条德里克
Feb 25 at 1:06
@炸鱼薯条德里克 "partition table is more like a simple kernel built-in device-mapper solution." Is a partition table a mapping from what to what? Is LVM's device-mapper solution a mapping from what to what?
– Tim
Feb 26 at 4:28
from one physical disk to several partition block devices. from physical disks to LVs.@Tim
– 炸鱼薯条德里克
Feb 26 at 4:48
add a comment |
They are both block storage devices. In principle one could add a partition table to a partition, thus adding partitions to it. However Operating Systems may not recursively traverse partitions, so they may no be found, and thus may not be treated the same.
Note: Extended partitions are a partition with a partition table within.
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
They are both block storage devices. In principle one could add a partition table to a partition, thus adding partitions to it. However Operating Systems may not recursively traverse partitions, so they may no be found, and thus may not be treated the same.
Note: Extended partitions are a partition with a partition table within.
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
answered Feb 24 at 17:04
ctrl-alt-delorctrl-alt-delor
12k42360
12k42360
partition table is more like a simple kernel built-in device-mapper solution. Pretty old, but still in common use.
– 炸鱼薯条德里克
Feb 25 at 1:06
@炸鱼薯条德里克 "partition table is more like a simple kernel built-in device-mapper solution." Is a partition table a mapping from what to what? Is LVM's device-mapper solution a mapping from what to what?
– Tim
Feb 26 at 4:28
from one physical disk to several partition block devices. from physical disks to LVs.@Tim
– 炸鱼薯条德里克
Feb 26 at 4:48
add a comment |
partition table is more like a simple kernel built-in device-mapper solution. Pretty old, but still in common use.
– 炸鱼薯条德里克
Feb 25 at 1:06
@炸鱼薯条德里克 "partition table is more like a simple kernel built-in device-mapper solution." Is a partition table a mapping from what to what? Is LVM's device-mapper solution a mapping from what to what?
– Tim
Feb 26 at 4:28
from one physical disk to several partition block devices. from physical disks to LVs.@Tim
– 炸鱼薯条德里克
Feb 26 at 4:48
partition table is more like a simple kernel built-in device-mapper solution. Pretty old, but still in common use.
– 炸鱼薯条德里克
Feb 25 at 1:06
partition table is more like a simple kernel built-in device-mapper solution. Pretty old, but still in common use.
– 炸鱼薯条德里克
Feb 25 at 1:06
@炸鱼薯条德里克 "partition table is more like a simple kernel built-in device-mapper solution." Is a partition table a mapping from what to what? Is LVM's device-mapper solution a mapping from what to what?
– Tim
Feb 26 at 4:28
@炸鱼薯条德里克 "partition table is more like a simple kernel built-in device-mapper solution." Is a partition table a mapping from what to what? Is LVM's device-mapper solution a mapping from what to what?
– Tim
Feb 26 at 4:28
from one physical disk to several partition block devices. from physical disks to LVs.@Tim
– 炸鱼薯条德里克
Feb 26 at 4:48
from one physical disk to several partition block devices. from physical disks to LVs.@Tim
– 炸鱼薯条德里克
Feb 26 at 4:48
add a comment |
You can't make the whole disk a PV if there is at least one partition
on it (because pvcreate won't let you).
All this is saying is that pvcreate refuses to wipe out your partition table if one exists. The point of this is to prevent data loss if a user accidentally runs pvcreate /dev/sda.
If /dev/sda isn't partitioned you can run pvcreate /dev/sda to make the whole disk (even the area of the disk where a partition table would exist) a PV.
If /dev/sda is partitioned (e.g. MBR or GPT) pvcreate doesn't want to take a chance ("it won't let you"). This is a safety mechanism, not a technical limitation.
answered Feb 24 at 17:58
catanmancatanman
9612
add a comment |
You can't make the whole disk a PV if there is at least one partition
on it (because pvcreate won't let you).
All this is saying is that pvcreate refuses to wipe out your partition table if one exists. The point of this is to prevent data loss if a user accidentally runs pvcreate /dev/sda.
If /dev/sda isn't partitioned you can run pvcreate /dev/sda to make the whole disk (even the area of the disk where a partition table would exist) a PV.
If /dev/sda is partitioned (e.g. MBR or GPT) pvcreate doesn't want to take a chance ("it won't let you"). This is a safety mechanism, not a technical limitation.
answered Feb 24 at 17:58
catanmancatanman
9612
add a comment |
You can't make the whole disk a PV if there is at least one partition
on it (because pvcreate won't let you).
All this is saying is that pvcreate refuses to wipe out your partition table if one exists. The point of this is to prevent data loss if a user accidentally runs pvcreate /dev/sda.
If /dev/sda isn't partitioned you can run pvcreate /dev/sda to make the whole disk (even the area of the disk where a partition table would exist) a PV.
If /dev/sda is partitioned (e.g. MBR or GPT) pvcreate doesn't want to take a chance ("it won't let you"). This is a safety mechanism, not a technical limitation.
answered Feb 24 at 17:58
catanmancatanman
9612
You can't make the whole disk a PV if there is at least one partition
on it (because pvcreate won't let you).
All this is saying is that pvcreate refuses to wipe out your partition table if one exists. The point of this is to prevent data loss if a user accidentally runs pvcreate /dev/sda.
If /dev/sda isn't partitioned you can run pvcreate /dev/sda to make the whole disk (even the area of the disk where a partition table would exist) a PV.
If /dev/sda is partitioned (e.g. MBR or GPT) pvcreate doesn't want to take a chance ("it won't let you"). This is a safety mechanism, not a technical limitation.
answered Feb 24 at 17:58
catanmancatanman
9612
answered Feb 24 at 17:58
catanmancatanman
9612
answered Feb 24 at 17:58
catanmancatanman
9612
answered Feb 24 at 17:58
catanmancatanman
9612
9612
add a comment |
add a comment |
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Partitions exist when defined by a partition table. For this reason I wouldn't consider a disk to be a partition
– Torin
Feb 24 at 16:52