Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-04 Thread Zdenek Kabelac
Dne 04. 02. 22 v 1:01 Demi Marie Obenour napsal(a): On Thu, Feb 03, 2022 at 01:28:37PM +0100, Zdenek Kabelac wrote: Dne 03. 02. 22 v 5:48 Demi Marie Obenour napsal(a): On Mon, Jan 31, 2022 at 10:29:04PM +0100, Marian Csontos wrote: On Sun, Jan 30, 2022 at 11:17 PM Demi Marie Obenour <

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-03 Thread Demi Marie Obenour
On Thu, Feb 03, 2022 at 01:28:37PM +0100, Zdenek Kabelac wrote: > Dne 03. 02. 22 v 5:48 Demi Marie Obenour napsal(a): > > On Mon, Jan 31, 2022 at 10:29:04PM +0100, Marian Csontos wrote: > > > On Sun, Jan 30, 2022 at 11:17 PM Demi Marie Obenour < > > > d...@invisiblethingslab.com> wrote: > > > > >

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-03 Thread Zdenek Kabelac
Dne 03. 02. 22 v 5:48 Demi Marie Obenour napsal(a): On Mon, Jan 31, 2022 at 10:29:04PM +0100, Marian Csontos wrote: On Sun, Jan 30, 2022 at 11:17 PM Demi Marie Obenour < d...@invisiblethingslab.com> wrote: On Sun, Jan 30, 2022 at 04:39:30PM -0500, Stuart D. Gathman wrote: Your VM usage is

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-02 Thread Demi Marie Obenour
On Mon, Jan 31, 2022 at 10:29:04PM +0100, Marian Csontos wrote: > On Sun, Jan 30, 2022 at 11:17 PM Demi Marie Obenour < > d...@invisiblethingslab.com> wrote: > >> On Sun, Jan 30, 2022 at 04:39:30PM -0500, Stuart D. Gathman wrote: >>> Your VM usage is different from ours - you seem to need to

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-02 Thread Demi Marie Obenour
On Wed, Feb 02, 2022 at 11:04:37AM +0100, Zdenek Kabelac wrote: > Dne 02. 02. 22 v 3:09 Demi Marie Obenour napsal(a): > > On Sun, Jan 30, 2022 at 06:43:13PM +0100, Zdenek Kabelac wrote: > > > Dne 30. 01. 22 v 17:45 Demi Marie Obenour napsal(a): > > > > On Sun, Jan 30, 2022 at 11:52:52AM +0100,

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-02 Thread Zdenek Kabelac
Dne 02. 02. 22 v 3:09 Demi Marie Obenour napsal(a): On Sun, Jan 30, 2022 at 06:43:13PM +0100, Zdenek Kabelac wrote: Dne 30. 01. 22 v 17:45 Demi Marie Obenour napsal(a): On Sun, Jan 30, 2022 at 11:52:52AM +0100, Zdenek Kabelac wrote: Dne 30. 01. 22 v 1:32 Demi Marie Obenour napsal(a): On Sat,

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-01 Thread Marian Csontos
On Sun, Jan 30, 2022 at 11:17 PM Demi Marie Obenour < d...@invisiblethingslab.com> wrote: > On Sun, Jan 30, 2022 at 04:39:30PM -0500, Stuart D. Gathman wrote: > > Your VM usage is different from ours - you seem to need to clone and > > activate a VM quickly (like a vps provider might need to do).

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-02-01 Thread Demi Marie Obenour
On Sun, Jan 30, 2022 at 06:43:13PM +0100, Zdenek Kabelac wrote: > Dne 30. 01. 22 v 17:45 Demi Marie Obenour napsal(a): > > On Sun, Jan 30, 2022 at 11:52:52AM +0100, Zdenek Kabelac wrote: > > > Dne 30. 01. 22 v 1:32 Demi Marie Obenour napsal(a): > > > > On Sat, Jan 29, 2022 at 10:32:52PM +0100,

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Gionatan Danti
Il 2022-01-30 22:17 Demi Marie Obenour ha scritto: On Xen, the paravirtualised block backend driver (blkback) requires a block device, so file-based virtual disks are implemented with a loop device managed by the toolstack. Suggestions for improving this less-than-satisfactory situation are

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Gionatan Danti
Il 2022-01-30 22:39 Stuart D. Gathman ha scritto: I use LVM as flexible partitions (i.e. only classic LVs, no thin pool). Classic LVs perform like partitions, literally using the same driver (device mapper) with a small number of extents, and are if anything more recoverable than partition

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Demi Marie Obenour
On Sun, Jan 30, 2022 at 04:39:30PM -0500, Stuart D. Gathman wrote: > On Sun, 2022-01-30 at 11:45 -0500, Demi Marie Obenour wrote: > > On Sun, Jan 30, 2022 at 11:52:52AM +0100, Zdenek Kabelac wrote: > > > > > > > > Since you mentioned ZFS - you might want focus on using 'ZFS-only' > > > solution.

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Stuart D. Gathman
On Sun, 2022-01-30 at 11:45 -0500, Demi Marie Obenour wrote: > On Sun, Jan 30, 2022 at 11:52:52AM +0100, Zdenek Kabelac wrote: > > > > > Since you mentioned ZFS - you might want focus on using 'ZFS-only' > > solution. > > Combining  ZFS or Btrfs with lvm2 is always going to be a painful > > way

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Demi Marie Obenour
On Sun, Jan 30, 2022 at 09:27:56PM +0100, Gionatan Danti wrote: > Il 2022-01-30 18:43 Zdenek Kabelac ha scritto: > > Chain filesystem->block_layer->filesystem->block_layer is something > > you most likely do not want to use for any well performing solution... > > But it's ok for testing... > > I

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Gionatan Danti
Il 2022-01-30 18:43 Zdenek Kabelac ha scritto: Chain filesystem->block_layer->filesystem->block_layer is something you most likely do not want to use for any well performing solution... But it's ok for testing... I second that. Demi Marie - just a question: are you sure do you really needs a

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Zdenek Kabelac
Dne 30. 01. 22 v 17:45 Demi Marie Obenour napsal(a): On Sun, Jan 30, 2022 at 11:52:52AM +0100, Zdenek Kabelac wrote: Dne 30. 01. 22 v 1:32 Demi Marie Obenour napsal(a): On Sat, Jan 29, 2022 at 10:32:52PM +0100, Zdenek Kabelac wrote: Dne 29. 01. 22 v 21:34 Demi Marie Obenour napsal(a): How

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Demi Marie Obenour
On Sun, Jan 30, 2022 at 11:52:52AM +0100, Zdenek Kabelac wrote: > Dne 30. 01. 22 v 1:32 Demi Marie Obenour napsal(a): > > On Sat, Jan 29, 2022 at 10:32:52PM +0100, Zdenek Kabelac wrote: > > > Dne 29. 01. 22 v 21:34 Demi Marie Obenour napsal(a): > > > > How much slower are operations on an LVM2

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-30 Thread Zdenek Kabelac
Dne 30. 01. 22 v 1:32 Demi Marie Obenour napsal(a): On Sat, Jan 29, 2022 at 10:32:52PM +0100, Zdenek Kabelac wrote: Dne 29. 01. 22 v 21:34 Demi Marie Obenour napsal(a): How much slower are operations on an LVM2 thin pool compared to manually managing a dm-thin target via ioctls? I am mostly

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-29 Thread Demi Marie Obenour
On Sat, Jan 29, 2022 at 10:32:52PM +0100, Zdenek Kabelac wrote: > Dne 29. 01. 22 v 21:34 Demi Marie Obenour napsal(a): > > How much slower are operations on an LVM2 thin pool compared to manually > > managing a dm-thin target via ioctls? I am mostly concerned about > > volume snapshot, creation,

Re: [linux-lvm] LVM performance vs direct dm-thin

2022-01-29 Thread Zdenek Kabelac
Dne 29. 01. 22 v 21:34 Demi Marie Obenour napsal(a): How much slower are operations on an LVM2 thin pool compared to manually managing a dm-thin target via ioctls? I am mostly concerned about volume snapshot, creation, and destruction. Data integrity is very important, so taking shortcuts that

[linux-lvm] LVM performance vs direct dm-thin

2022-01-29 Thread Demi Marie Obenour
How much slower are operations on an LVM2 thin pool compared to manually managing a dm-thin target via ioctls? I am mostly concerned about volume snapshot, creation, and destruction. Data integrity is very important, so taking shortcuts that risk data loss is out of the question. However, the