Hi,
that's great !
I'm not sure it's related, but do you have any plan to add support to
restore/extract files from the vm filesystem directly ?
if we could make some kind of qemu-nbd + mount loop of the backup
volume for example.
This is the main blocking feature for me, instead using my rbd
import/export for backups.
Regards,
Alexandre
Le lundi 11 janvier 2021 à 12:13 +0100, Stefan Reiter a écrit :
> "live-restore" allows starting a VM immediately from a backup
> snapshot, no
> waiting for a long restore process. This is made possible with QEMU
> backing
> images, i.e. data is read from the backup which is attached to the VM
> as a
> drive, but new data is written to the destination, while a background
> process
> ('block-stream') copies over data in a linear fashion as well.
>
> QEMU backing images are normally only supported for qcow2 images, but
> since the
> destination always starts out empty, we can use a dirty bitmap to
> achieve the
> same effect - this is implemented as the 'alloc-track' driver in the
> 'qemu' part
> of the series.
>
> The Rust part of the equation is adjusted to provide (quiet a lot)
> more caching,
> as mixing random read/write from the guest with the linear reads from
> the
> background process (both of which may use read sizes smaller or
> bigger than a
> single chunk) would thrash performance without large buffers.
>
> I've marked the feature as 'experimental' in the GUI for now, as I'm
> sure there
> are a lot of edge cases I've missed to test, and there's also the
> possibility of
> data loss, since anything the VM writes during the restore is removed
> if the
> restore fails.
>
>
> qemu: Stefan Reiter (3):
> PVE: explicitly add libuuid as linking dependency
> PVE: block/pbs: fast-path reads without allocation if possible
> block: add alloc-track driver
>
> Makefile.objs | 2 +
> block/Makefile.objs | 1 +
> block/alloc-track.c | 319
> ++++++++++++++++++++++++++++++++++++++++++++
> block/pbs.c | 17 ++-
> 4 files changed, 336 insertions(+), 3 deletions(-)
> create mode 100644 block/alloc-track.c
>
> proxmox-backup: Stefan Reiter (1):
> RemoteChunkReader: add LRU cached variant
>
> src/bin/proxmox_backup_client/mount.rs | 4 +-
> src/client/remote_chunk_reader.rs | 77 ++++++++++++++++++++----
> --
> 2 files changed, 62 insertions(+), 19 deletions(-)
>
> proxmox-backup-qemu: Stefan Reiter (1):
> access: use bigger cache and LRU chunk reader
>
> src/restore.rs | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> qemu-server: Stefan Reiter (5):
> make qemu_drive_mirror_monitor more generic
> cfg2cmd: allow PBS snapshots as backing files for drives
> enable live-restore for PBS
> extract register_qmeventd_handle to QemuServer.pm
> live-restore: register qmeventd handle
>
> PVE/API2/Qemu.pm | 15 ++-
> PVE/QemuServer.pm | 263 ++++++++++++++++++++++++++++++++-----
> --
> PVE/VZDump/QemuServer.pm | 32 +----
> 3 files changed, 233 insertions(+), 77 deletions(-)
>
> manager: Stefan Reiter (1):
> ui: restore: add live-restore checkbox
>
> www/manager6/grid/BackupView.js | 8 +++++--
> www/manager6/storage/BackupView.js | 7 ++++--
> www/manager6/window/Restore.js | 38
> +++++++++++++++++++++++++++++-
> 3 files changed, 48 insertions(+), 5 deletions(-)
>
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