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Re: [Qemu-devel] [PATCH v1 0/8]: QMP: Thin provisioning support
From: |
Luiz Capitulino |
Subject: |
Re: [Qemu-devel] [PATCH v1 0/8]: QMP: Thin provisioning support |
Date: |
Mon, 11 Jul 2011 14:43:40 -0300 |
On Tue, 5 Jul 2011 15:17:43 -0300
Luiz Capitulino <address@hidden> wrote:
> Roughly speaking, thin provisioning is a feature where the VM is started with
> a small storage and when a no space error is triggered, more space is
> allocated
> and the VM is put to run again.
block guys ping?
This series has some block layer changes which would be nice to get feedback
from you.
>
> This series allows a management tool using QMP to implement thin provisioning
> support. It does the following:
>
> 1. patches 1/8 and 2/8 extend the query-status command to contain a more
> complete and descriptive status
>
> 2. patches 3/8 to 6/8 add support to the block layer to track the status of
> the last executed I/O operation. This is supported by ide, virtio and scsi
> devices
>
> 3. The last two patches extend the "query-block" and "info block" commands
> to print the last I/O status field (this is per device)
>
> Basically, all a management tool has to do to implement thin provisioning is
> to wait for a BLOCK_IO_ERROR event (or the STOP event), check the VM is
> stopped by issuing query-status and then find which device failed by using
> query-block. Of course that the VM has to be configured to stop on errors.
>
> A last important detail: Anthony has proposed how the query-status command
> should be extended to support this[1]. However, I had to make the following
> changes to his original proposal:
>
> - Added states: debug, inmigrate, load-state-error and internal-error
> - Dropped: singlestep
>
> You'll find more details in the patches, thanks!
>
> [1] http://lists.nongnu.org/archive/html/qemu-devel/2011-06/msg00352.html
>
> block.c | 37 ++++++++++++++++++++++++++++++++++++-
> block.h | 7 +++++++
> block_int.h | 2 ++
> gdbstub.c | 4 ++++
> hw/ide/core.c | 6 ++++++
> hw/scsi-disk.c | 7 +++++++
> hw/virtio-blk.c | 4 ++++
> hw/watchdog.c | 1 +
> kvm-all.c | 1 +
> migration.c | 3 +++
> monitor.c | 8 +++++---
> qmp-commands.hx | 23 ++++++++++++++++++++++-
> sysemu.h | 19 +++++++++++++++++++
> vl.c | 37 +++++++++++++++++++++++++++++++++++++
> 14 files changed, 154 insertions(+), 5 deletions(-)
>
- Re: [Qemu-devel] [PATCH 3/8] block: Support to keep track of I/O status, (continued)
- [Qemu-devel] [PATCH 6/8] scsi: Support I/O status, Luiz Capitulino, 2011/07/05
- [Qemu-devel] [PATCH 4/8] ide: Support I/O status, Luiz Capitulino, 2011/07/05
- [Qemu-devel] [PATCH 7/8] QMP: query-status: Add 'io-status' key, Luiz Capitulino, 2011/07/05
- [Qemu-devel] [PATCH 5/8] virtio: Support I/O status, Luiz Capitulino, 2011/07/05
- [Qemu-devel] [PATCH 8/8] HMP: Print 'io-status' information, Luiz Capitulino, 2011/07/05
- Re: [Qemu-devel] [PATCH v1 0/8]: QMP: Thin provisioning support,
Luiz Capitulino <=