QEMU Backup. Maxim Nestratov, Virtuozzo Vladimir Sementsov-Ogievskiy, Virtuozzo
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1 QEMU Backup Maxim Nestratov, Virtuozzo Vladimir Sementsov-Ogievskiy, Virtuozzo
2 QEMU Backup Vladimir Sementsov-Ogievskiy, Virtuozzo
3 Full featured backup Online backup Fast Not very invasive for the guest Incremental Dirty bitmaps persistence and migration External backup API Copyright 2017 Virtuozzo. All Rights Reserved. 3
4 Incremental Copyright 2017 Virtuozzo. All Rights Reserved. 4
5 Incremental Copyright 2017 Virtuozzo. All Rights Reserved. 5
6 Incremental: persistent Qcow2 bitmaps merged into 2.9 Several named bitmaps Size equals image size Sparse format Other formats are under discussion Copyright 2017 Virtuozzo. All Rights Reserved. 6
7 Incremental: migration Variants: Fist approach: meta bitmaps Current approach: postcopy Through storage (works for qcow2) Copyright 2017 Virtuozzo. All Rights Reserved. 7
8 Incremental: snapshots Internal snapshots Dirty bitmaps correspond to active state Switch to snapshot = the whole disk is dirty External snapshots Everything is possible Copyright 2017 Virtuozzo. All Rights Reserved. 8
9 Performance: current work Backup = simple copy + COW (write notifiers) Current approach: Sequential copying + sequential notifiers New arc: Queues of requests Several copying coroutines Notifiers just increase priority of request Earlier notifier release Copyright 2017 Virtuozzo. All Rights Reserved. 9
10 Performance: ideas and plans How to handle COW? Current: guest wait for backup Reverse delta: read COW area to local delta Copyright 2017 Virtuozzo. All Rights Reserved. 10
11 External backup API Image fleecing scheme Incremental backup NBD block-status extension Additional API for dirty bitmap management Copyright 2017 Virtuozzo. All Rights Reserved. 11
12 External backup API: image fleecing Copyright 2017 Virtuozzo. All Rights Reserved. 12
13 External backup API: NBD block-status Current NBD: payload only for READ Extension: structured replies Extension: block-status Negotiation phase: select metadata contexts Transmission phase New command NBD_CMD_BLOCK_STATUS Reply chunk contains extent descriptors Copyright 2017 Virtuozzo. All Rights Reserved. 13
14 QEMU Backup summary Merged: Qcow2 bitmaps Done in Virtuozzo: New backup architecture (async IO) Bitmaps migration NBD block-status extension Near future: External backup API Copyright 2017 Virtuozzo. All Rights Reserved. 14
15 Libvirt Backup Maxim Nestratov, Virtuozzo
16 Libvirt Backup API first proposal "Push" backups "Pull" backups Copyright 2017 Virtuozzo. All Rights Reserved. 16
17 Why not snapshots? Different storage Incremental backups Multiple chains Agentless Copyright 2017 Virtuozzo. All Rights Reserved. 17
18 "Push" or "Managed" Backups A new set of functions similar to snapshots Create, List, Delete, Edit Managed by libvirt Local to host Can be saved to any supported block device NAT friendly Copyright 2017 Virtuozzo. All Rights Reserved. 18
19 Managed backup scheme Copyright 2017 Virtuozzo. All Rights Reserved. 19
20 Managed backup concerns Hard to use in clusters Guest performance influence due to network throughput A lot of code to implement Access to backup storage Copyright 2017 Virtuozzo. All Rights Reserved. 20
21 "Pull" or "External" Backups Mostly two functions: Start/Stop Exposes block device via NBD protocol Uses NBD protocol extension for incremental backups Copyright 2017 Virtuozzo. All Rights Reserved. 21
22 External backups advantages Tolerant to guests performance Controlled externally Cluster friendly Copyright 2017 Virtuozzo. All Rights Reserved. 22
23 External backups concerns NAT unfriendly Tolerant to guests performance Uses NBD protocol extension for incremental backups Controlled externally Not bound to a specific hypervisor host Copyright 2017 Virtuozzo. All Rights Reserved. 23
24 External backup scheme Copyright 2017 Virtuozzo. All Rights Reserved. 24
25 Thank you Maxim Vladimir
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