From: Fiona Ebner <f.ebner@proxmox.com>
To: Dietmar Maurer <dietmar@proxmox.com>,
Proxmox VE development discussion <pve-devel@lists.proxmox.com>,
"DERUMIER, Alexandre" <alexandre.derumier@groupe-cyllene.com>
Subject: Re: [pve-devel] [RFC docs 13/13] vzdump: add section about backup fleecing
Date: Fri, 26 Jan 2024 09:39:30 +0100 [thread overview]
Message-ID: <b750d1a4-0eaa-4edc-820b-ade6913360b2@proxmox.com> (raw)
In-Reply-To: <143499946.1270.1706206703161@webmail.proxmox.com>
Am 25.01.24 um 19:18 schrieb Dietmar Maurer:
>>>> Stupid question: Wouldn't It be much easier to add a simple IO-buffer
>>>> with limited capacity, implemented inside the RUST backup code?
>>
>> At work, we are running a backup cluster on remote location with hdd ,
>> and a production cluster with super fast nvme,
>> and sometimes I have really big write spikes (in GB/s), so it's
>> impossible for the backup storage or network to handle it without
>> increase latency or saturate link.
>>
>> So with limited capacity (how much ? in memory ?), I don't think it
>> solve the problem. If the buffer is full, the vm write will hang.
>
> Ok, I can see the problem...
Yes, exactly. Sure, it could be done with an in-memory buffer. And while
it would help some people, it would help in much fewer scenarios
compared to fleecing, because RAM is almost always more expensive/more
limited than storage space.
next prev parent reply other threads:[~2024-01-26 8:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-25 14:41 [pve-devel] [RFC qemu/guest-common/manager/qemu-server/docs 00/13] fix #4136: implement " Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [PATCH qemu 01/13] backup: factor out gathering device info into helper Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [PATCH qemu 02/13] backup: get device info: code cleanup Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [PATCH qemu 03/13] block/io: clear BDRV_BLOCK_RECURSE flag after recursing in bdrv_co_block_status Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC qemu 04/13] block/copy-before-write: create block_copy bitmap in filter node Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC qemu 05/13] qapi: blockdev-backup: add discard-source parameter Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [HACK qemu 06/13] block/{copy-before-write, snapshot-access}: implement bdrv_co_get_info driver callback Fiona Ebner
2024-01-29 14:35 ` Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [HACK qemu 07/13] block/block-copy: always consider source cluster size too Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC qemu 08/13] PVE backup: add fleecing option Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC guest-common 09/13] vzdump: schema: add fleecing property string Fiona Ebner
2024-01-29 15:41 ` Fiona Ebner
2024-01-30 14:03 ` DERUMIER, Alexandre
2024-02-01 8:28 ` Fiona Ebner
2024-02-01 12:39 ` DERUMIER, Alexandre
2024-02-01 13:11 ` Fiona Ebner
2024-02-01 13:20 ` DERUMIER, Alexandre
2024-02-01 13:27 ` Fiona Ebner
2024-02-01 21:33 ` DERUMIER, Alexandre
2024-02-02 8:30 ` Fiona Ebner
2024-02-01 13:30 ` Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC manager 10/13] vzdump: handle new 'fleecing' " Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC qemu-server 11/13] backup: disk info: also keep track of size Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC qemu-server 12/13] backup: implement fleecing option Fiona Ebner
2024-01-29 15:28 ` Fiona Ebner
2024-01-25 14:41 ` [pve-devel] [RFC docs 13/13] vzdump: add section about backup fleecing Fiona Ebner
2024-01-25 16:13 ` Dietmar Maurer
2024-01-25 16:41 ` DERUMIER, Alexandre
2024-01-25 18:18 ` Dietmar Maurer
2024-01-26 8:39 ` Fiona Ebner [this message]
2024-01-25 16:02 ` [pve-devel] [RFC qemu/guest-common/manager/qemu-server/docs 00/13] fix #4136: implement " DERUMIER, Alexandre
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