On Wed, 24 Jun 2015 14:06:19 -0500
Chris Adams li...@cmadams.net wrote:
Now, if btrfs ever gets all the kinks worked out (and has a stable
fsck for the corner cases), it integrates volume management into the
filesystem, which makes some of the management easier. I used AdvFS on
On Fri, Jun 26, 2015 at 4:47 AM, Steve Clark scl...@netwolves.com wrote:
On 06/25/2015 06:44 PM, Chris Murphy wrote:
I did a bunch of testing of Raw, qcow2, and LV backed VM storage circa
Fedora 19/20 and found very little difference. What mattered most was
the (libvirt) cache setting,
Am 26.06.2015 um 12:47 schrieb Steve Clark scl...@netwolves.com:
On 06/25/2015 06:44 PM, Chris Murphy wrote:
Gordon Messmer gordon.messmer at gmail.com Wed Jun 24 01:42:13 UTC 2015
I wondered the same thing, especially in the context of someone who
prefers virtual machines. LV-backed VMs
On 06/26/2015 07:58 AM, Mark Milhollan wrote:
On Wed, 24 Jun 2015, Gordon Messmer wrote:
1) If you have a system with a single disk, you have to reboot to add
partitions for new guests. Linux won't refresh the partition table on the disk
it boots from.
I'm not sure this is still true, but I
On Fri, Jun 26, 2015 at 10:51 AM, Gordon Messmer
gordon.mess...@gmail.com wrote:
, or alternatively making the LVs
redundant after install is a single command (each) and you can choose
whether it should be mere mirroring or some MD manged RAID level (modulo
the LVM RAID MD monitoring issue).
On 6/26/2015 12:34 PM, Chris Murphy wrote:
At the moment, LVM RAID is only supported with conventional/thick
provisioning. So if you want to do software RAID and also use LVM thin
provisioning, you still need to use mdadm (or hardware RAID).
You can do thin pools as RAID[1,5,N], just not
On 06/25/2015 06:44 PM, Chris Murphy wrote:
Gordon Messmer gordon.messmer at gmail.com Wed Jun 24 01:42:13 UTC 2015
I wondered the same thing, especially in the context of someone who
prefers virtual machines. LV-backed VMs have *dramatically* better disk
performance than file-backed VMs.
I
On 06/25/2015 01:20 PM, Chris Adams wrote:
...It's basically a way to assemble one arbitrary set of block devices
and then divide them into another arbitrary set of block devices, but
now separate from the underlying physical structure.
Regular partitions have various limitations (one big
On 06/23/2015 01:54 PM, Marko Vojinovic wrote:
So the story ended up with lots of people in upgrading griefs purely
because they couldn't resize the separate /boot partition, and it was
separate because LVM was present, and LVM was present with the goal of
making partition resizing easy! A
On 6/24/2015 3:11 PM, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something I
don't remember how to do regarding LVM, so I usually just don't bother
with it at all. I believe it has some benefit
At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org
wrote:
On Wed, June 24, 2015 16:11, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something
I don't remember how to
On Wed, June 24, 2015 16:11, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something
I don't remember how to do regarding LVM, so I usually just
don't bother with it at all.
I believe it has some
James B. Byrne wrote:
On Wed, June 24, 2015 16:11, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something
I don't remember how to do regarding LVM, so I usually just
don't bother with it at all.
On 06/25/2015 11:03 AM, James B. Byrne wrote:
On Wed, June 24, 2015 16:11, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something
I don't remember how to do regarding LVM, so I usually just
don't
On Tue, 2015-06-23 at 11:15 -0500, Jason Warr wrote:
On 6/23/2015 10:33 AM, Marko Vojinovic wrote:
Inside / (which is mostly always ext4), 100% of the time. :-)
That said, I prefer virtual machines over multiboot environments,
and I
absolutely despise LVM --- that cursed thing is never
Robert Heller wrote:
At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org
wrote:
On Wed, June 24, 2015 16:11, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something
I don't
Once upon a time, Adam Tauno Williams awill...@whitemice.org said:
There may be numerous commands... but isn't it pretty obvious what each
one of them do? Often lvtabtab is plenty of hinting to get to the
right thing. And each of the commands uses the same syntax for
options.
The key thing
On Thu, 2015-06-25 at 11:50 -0400, Robert Heller wrote:
At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list
centos@centos.org wrote:HA! You only really need to learn *one*
command: the man command.
The man
provides 'enlightenment' for all other commands:
man vgdisplay
man lvdisplay
On Thu, Jun 25, 2015 at 10:49:57AM -0500, Jason Warr wrote:
On 6/24/2015 3:11 PM, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something I
don't remember how to do regarding LVM, so I usually
On Thu, June 25, 2015 11:59 am, Scott Robbins wrote:
On Thu, Jun 25, 2015 at 10:49:57AM -0500, Jason Warr wrote:
On 6/24/2015 3:11 PM, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get tired of googling every-time I have to do something I
On 6/25/2015 8:50 AM, Robert Heller wrote:
man vgdisplay
man lvdisplay
man lvcreate
man lvextend
man lvresize
man lvreduce
man lvremove
man e2fsck
man resize2fs
man xfs_growfs
--
john r pierce, recycling bits in santa cruz
___
CentOS mailing list
At Thu, 25 Jun 2015 13:18:04 -0400 CentOS mailing list centos@centos.org
wrote:
Robert Heller wrote:
At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list centos@centos.org
wrote:
On Wed, June 24, 2015 16:11, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM
John R Pierce wrote:
On 6/25/2015 11:12 AM, James A. Peltier wrote:
You forgot man this opinion thread is getting really long
No manual entry for this opinion thread is getting really long
That's obviously not the case: it's *all* manual entry of text g
mark
- Original Message -
| On 6/25/2015 8:50 AM, Robert Heller wrote:
| man vgdisplay
| man lvdisplay
| man lvcreate
| man lvextend
| man lvresize
| man lvreduce
| man lvremove
| man e2fsck
| man resize2fs
|
| man xfs_growfs
You forgot man this opinion thread is getting really long
On Thu, Jun 25, 2015 at 12:05:13PM -0500, Valeri Galtsev wrote:
On Thu, June 25, 2015 11:59 am, Scott Robbins wrote:
On Thu, Jun 25, 2015 at 10:49:57AM -0500, Jason Warr wrote:
AFAIK, your page exists forever. This is how I first learned LVM: from
your page. (Not that I use LVM much,
On Thu, June 25, 2015 12:18 pm, m.r...@5-cent.us wrote:
Robert Heller wrote:
At Thu, 25 Jun 2015 11:03:18 -0400 CentOS mailing list
centos@centos.org
wrote:
On Wed, June 24, 2015 16:11, Chuck Campbell wrote:
Is there an easy to follow howto for normal LVM administration
tasks. I get
On 6/25/2015 11:12 AM, James A. Peltier wrote:
You forgot man this opinion thread is getting really long
No manual entry for this opinion thread is getting really long
--
john r pierce, recycling bits in santa cruz
___
CentOS mailing list
Gordon Messmer gordon.messmer at gmail.com Wed Jun 24 01:42:13 UTC 2015
I wondered the same thing, especially in the context of someone who
prefers virtual machines. LV-backed VMs have *dramatically* better disk
performance than file-backed VMs.
I did a bunch of testing of Raw, qcow2, and
Mike - st257 silvertip257 at gmail.com Tue Jun 23 16:40:47 UTC 2015
On Tue, Jun 23, 2015 at 12:15 PM, Jason Warr jason at warr.net wrote:
I'm curious what has made some people hate LVM so much. I have been using
it for years on thousands of
No clue.
My experiences with LVM have been
Chris Adams linux at cmadams.net Wed Jun 24 19:06:19 UTC 2015
Btrfs may eventually obsolete a lot of
uses of LVM, but that's down the road.
LVM is the emacs of storage. It'll be here forever.
Btrfs doesn't export (virtual) block devices like LVM can, so it can't
be a backing for say iSCSI. And
Chris Adams linux at cmadams.net Wed Jun 24 13:14:34 UTC 2015
There are plenty of people that have documented the performance
differences, just Google it.
This is consistent with what I've experienced. Minimal difference.
http://web-docs.gsi.de/~tstibor/iozone/qcow.vs.lvm/
--
Chris Murphy
At Wed, 24 Jun 2015 14:06:30 -0400 CentOS mailing list centos@centos.org
wrote:
Gordon Messmer wrote:
On 06/23/2015 08:10 PM, Marko Vojinovic wrote:
Ok, you made me curious. Just how dramatic can it be? From where I'm
sitting, a read/write to a disk takes the amount of time it takes,
On Wed, 24 Jun 2015 10:40:59 -0700
Gordon Messmer gordon.mess...@gmail.com wrote:
On 06/23/2015 08:10 PM, Marko Vojinovic wrote:
For concreteness, let's say I have a guest machine, with a
dedicated physical partition for it, on a single drive. Or, I have
the same thing, only the
At Wed, 24 Jun 2015 04:10:35 +0100 CentOS mailing list centos@centos.org
wrote:
On Tue, 23 Jun 2015 18:42:13 -0700
Gordon Messmer gordon.mess...@gmail.com wrote:
I wondered the same thing, especially in the context of someone who
prefers virtual machines. LV-backed VMs have
Once upon a time, Marko Vojinovic vvma...@gmail.com said:
On Tue, 23 Jun 2015 18:42:13 -0700
Gordon Messmer gordon.mess...@gmail.com wrote:
I wondered the same thing, especially in the context of someone who
prefers virtual machines. LV-backed VMs have *dramatically* better
disk
On Tue, 23 Jun 2015, John R Pierce wrote:
While it has the same concepts, physical volumes, volume groups, logical
volumes, the LVM in AIX shares only the initials with Linux. I've heard
that Linux's LVM was based on HP-UX's design.
Sure, and IRIX had a similar concept, although my
On 06/23/2015 09:00 PM, Marko Vojinovic wrote:
On Tue, 23 Jun 2015 19:08:24 -0700
Gordon Messmer gordon.mess...@gmail.com wrote:
1) LVM makes MBR and GPT systems more consistent with each other,
reducing the probability of a bug that affects only one.
2) LVM also makes RAID and non-RAID systems
Gordon Messmer wrote:
On 06/23/2015 08:10 PM, Marko Vojinovic wrote:
Ok, you made me curious. Just how dramatic can it be? From where I'm
sitting, a read/write to a disk takes the amount of time it takes, the
hardware has a certain physical speed, regardless of the presence of
LVM. What am I
On 06/24/2015 11:06 AM, m.r...@5-cent.us wrote:
Here's a question: all of the arguments you're giving have to do with VMs.
Do you have some for straight-on-the-server, non-VM cases?
Marko sent two messages and suggested that we keep the VM performance
question as a reply to that one. My
On 06/23/2015 08:10 PM, Marko Vojinovic wrote:
Ok, you made me curious. Just how dramatic can it be? From where I'm
sitting, a read/write to a disk takes the amount of time it takes, the
hardware has a certain physical speed, regardless of the presence of
LVM. What am I missing?
Well, there's
On 06/24/2015 12:06 PM, Chris Adams wrote:
LVM snapshots make it easy to get point-in-time consistent backups,
including databases. For example, with MySQL, you can freeze and flush
all the databases, snapshot the LV, and release the freeze.
Exactly. And I mention this from time to time...
On 06/24/2015 12:35 PM, Gordon Messmer wrote:
Interesting. I wasn't aware that LVM had that option. I've been
looking at bcache and dm-cache. I'll have to look into that as well.
heh. LVM cache *is* dm-cache. Don't I feel silly.
___
CentOS
On 6/24/2015 2:06 PM, Chris Adams wrote:
Once upon a time, m.r...@5-cent.us m.r...@5-cent.us said:
Here's a question: all of the arguments you're giving have to do with VMs.
Do you have some for straight-on-the-server, non-VM cases?
I've used LVM on servers with hot-swap drives to migrate to
Once upon a time, m.r...@5-cent.us m.r...@5-cent.us said:
Here's a question: all of the arguments you're giving have to do with VMs.
Do you have some for straight-on-the-server, non-VM cases?
I've used LVM on servers with hot-swap drives to migrate to new storage
without downtime a number of
On 6/24/2015 1:06 PM, m.r...@5-cent.us wrote:
Gordon Messmer wrote:
On 06/23/2015 08:10 PM, Marko Vojinovic wrote:
Ok, you made me curious. Just how dramatic can it be? From where I'm
sitting, a read/write to a disk takes the amount of time it takes, the
hardware has a certain physical speed,
On 6/23/2015 10:33 AM, Marko Vojinovic wrote:
Inside / (which is mostly always ext4), 100% of the time. :-)
That said, I prefer virtual machines over multiboot environments, and I
absolutely despise LVM --- that cursed thing is never getting on my
drives. Never again, that is...
I'm curious
On Tue, 23 Jun 2015 11:15:30 -0500
Jason Warr ja...@warr.net wrote:
I'm curious what has made some people hate LVM so much. I have been
using it for years on thousands of production systems with no issues
that could not be easily explained as myself or someone else doing
something
On Tue, Jun 23, 2015 at 12:15 PM, Jason Warr ja...@warr.net wrote:
On 6/23/2015 10:33 AM, Marko Vojinovic wrote:
Inside / (which is mostly always ext4), 100% of the time. :-)
That said, I prefer virtual machines over multiboot environments, and I
absolutely despise LVM --- that cursed
On Tue, Jun 23, 2015 at 1:54 PM, Marko Vojinovic vvma...@gmail.com wrote:
On Tue, 23 Jun 2015 11:15:30 -0500
Jason Warr ja...@warr.net wrote:
I'm curious what has made some people hate LVM so much. I have been
using it for years on thousands of production systems with no issues
that could
Marko Vojinovic wrote:
On Tue, 23 Jun 2015 11:15:30 -0500
Jason Warr ja...@warr.net wrote:
I'm curious what has made some people hate LVM so much. I have been
using it for years on thousands of production systems with no issues
that could not be easily explained as myself or someone else
On 6/23/2015 11:23 AM, Mauricio Tavares wrote:
AIX does use lvm a lot. Main difference is their filesystem
allows live shrinking. Kinda nice to dynamically size a partition
depending on needs, as opposite to the so often suggested approach of
formatting the entire drive as one single
On Tue, 23 Jun 2015 14:23:52 -0400
Mauricio Tavares raubvo...@gmail.com wrote:
On Tue, Jun 23, 2015 at 1:54 PM, Marko Vojinovic vvma...@gmail.com
wrote:
On Tue, 23 Jun 2015 11:15:30 -0500
Jason Warr ja...@warr.net wrote:
I'm curious what has made some people hate LVM so much.
(3)
Marko Vojinovic wrote:
On Tue, 23 Jun 2015 14:23:52 -0400
Mauricio Tavares raubvo...@gmail.com wrote:
On Tue, Jun 23, 2015 at 1:54 PM, Marko Vojinovic vvma...@gmail.com
wrote:
On Tue, 23 Jun 2015 11:15:30 -0500
Jason Warr ja...@warr.net wrote:
I'm curious what has made some people
On 6/23/2015 3:31 PM, m.r...@5-cent.us wrote:
Marko Vojinovic wrote:
On Tue, 23 Jun 2015 14:23:52 -0400
Mauricio Tavares raubvo...@gmail.com wrote:
On Tue, Jun 23, 2015 at 1:54 PM, Marko Vojinovic vvma...@gmail.com
wrote:
On Tue, 23 Jun 2015 11:15:30 -0500
Jason Warr ja...@warr.net wrote:
On Tue, 23 Jun 2015 18:42:13 -0700
Gordon Messmer gordon.mess...@gmail.com wrote:
I wondered the same thing, especially in the context of someone who
prefers virtual machines. LV-backed VMs have *dramatically* better
disk performance than file-backed VMs.
Ok, you made me curious. Just how
On Tue, 23 Jun 2015 19:08:24 -0700
Gordon Messmer gordon.mess...@gmail.com wrote:
Such as:
1) LVM makes MBR and GPT systems more consistent with each other,
reducing the probability of a bug that affects only one.
2) LVM also makes RAID and non-RAID systems more consistent with each
On 06/23/2015 09:15 AM, Jason Warr wrote:
That said, I prefer virtual machines over multiboot environments, and I
absolutely despise LVM --- that cursed thing is never getting on my
drives. Never again, that is...
I'm curious what has made some people hate LVM so much.
I wondered the same
On 06/23/2015 10:54 AM, Marko Vojinovic wrote:
(1) I have no valid usecase for it. I don't remember when was the last
time I needed to resize partitions (probably back when I was trying to
install Windows 95). Disk space is very cheap, and if I really need to
have *that* much data on a single
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