What Is an Agentless Backup
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@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
It does actually get agentless backup, it's just not a very good one. I have agentless backups on my KVM systems. Better than VMware Free, not anything close to Hyper-V.
What product are you using for agentless backups?
We use KVM via Scale. Scale has built in agentless backups.
Since when?
You're not talking about their snapshot functionality?Yes, that's what agentless backups are, a form of snapshots.
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@fateknollogee said in How to take advantage of virtualization. Major products get updated:
Since when?
A few years.
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@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
It does actually get agentless backup, it's just not a very good one. I have agentless backups on my KVM systems. Better than VMware Free, not anything close to Hyper-V.
What product are you using for agentless backups?
We use KVM via Scale. Scale has built in agentless backups.
Since when?
You're not talking about their snapshot functionality?Yes, that's what agentless backups are, a form of snapshots.
Calling snapshots = agentless backups....now, that's a bit of a stretch.
I don't even think the Scale guys could/would make that claim. -
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
It does actually get agentless backup, it's just not a very good one. I have agentless backups on my KVM systems. Better than VMware Free, not anything close to Hyper-V.
What product are you using for agentless backups?
We use KVM via Scale. Scale has built in agentless backups.
Since when?
You're not talking about their snapshot functionality?Yes, that's what agentless backups are, a form of snapshots.
Calling snapshots = agentless backups....now, that's a bit of a stretch.
How is that a stretch in any way? What do you think Unitrends agentless backups are? I think thinking that agentless means anything other than a platform level snapshot is the stretch. Agentless is VERY clearly defined and well known and has always meant one thing. It never implies anything more than that. Just as agent based implies nothing special, either.
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It's become rather common and misleading that people take Veeam's insanely awesome agentless approach, or rare high end change block tracking tech, and because they are one popular agentless mechanism (and agent based, as well, making that assumption even more confusing to make) taking their special features that aren't tied to being agentless and redefining agentless to mean "Veeam".
Most each agentless were nothing but snapshot. Easily half still are. Many products that are very popular, mainstream agentless backups, are nothing more than snapshots. Even the best ones, like Veeam, are still using snapshots as the mechanism. So if snapshots aren't agentless... what is? We'd literally rule out all agentless products from being agentless if that were the case as the entire agentless category is one of snapshots.
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In Veam's own guide to Veeam Backup & Replication 9.5, they openly say (as has always been known) that they use the storage layer's native snapshot mechanism to get the data. Now some snapshot mechanisms, like those in ESXi, are super advanced and way more efficient than others and can do a lot of smart things. But Veeam themselves, the shining example of agentless backups, fundamentally uses snapshots just like everyone else. To be agentless, you have to have the storage layer doing the snapping, and currently snapping is the sole mechanism available whether on a local server, external storage array, RAIN, whatever. Since the 1990s, snapshots are the mechanism available for this. In fact, it's hard to picture what other option could exist, but maybe someday someone will invent one.
https://helpcenter.veeam.com/docs/backup/vsphere/backup_hiw.html?ver=95
8: "Veeam Backup & Replication requests vCenter Server or ESXi host to create a VM snapshot. VM disks are put to the read-only state, and every virtual disk receives a delta file. "
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@fateknollogee said in What Is an Agentless Backup:
I don't even think the Scale guys could/would make that claim.
They don't in their whitepaper, but might as well, as they state that for special cases and workloads that agent-based would be an alternative to the built-in backup system. As agentless is the only alternative to agent-based, and built in platform backups are called agentless, they've made it clear that that is what they are considering it, which they should, as that is clearly what it is.
https://www.scalecomputing.com/documents/white-papers/white_papers_backup_hc3.pdf
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@scottalanmiller said in What Is an Agentless Backup:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
@fateknollogee said in How to take advantage of virtualization. Major products get updated:
@scottalanmiller said in How to take advantage of virtualization. Major products get updated:
It does actually get agentless backup, it's just not a very good one. I have agentless backups on my KVM systems. Better than VMware Free, not anything close to Hyper-V.
What product are you using for agentless backups?
We use KVM via Scale. Scale has built in agentless backups.
Since when?
You're not talking about their snapshot functionality?Yes, that's what agentless backups are, a form of snapshots.
Calling snapshots = agentless backups....now, that's a bit of a stretch.
How is that a stretch in any way? What do you think Unitrends agentless backups are? I think thinking that agentless means anything other than a platform level snapshot is the stretch. Agentless is VERY clearly defined and well known and has always meant one thing. It never implies anything more than that. Just as agent based implies nothing special, either.
Agentless means the backup software is not installed on the VM. Agentless backups are not snapshots, but agentless backups do their backup with the help of snapshots.
"agentless backup" does not equal "snapshot"... rather, agentless backups are created with the help of snapshots, but the backup is not a snapshot.
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@obsolesce said in What Is an Agentless Backup:
Agentless means the backup software is not installed on the VM. Agentless backups are not snapshots, but agentless backups do their backup with the help of snapshots.
"agentless backup" does not equal "snapshot"... rather, agentless backups are created with the help of snapshots, but the backup is not a snapshot.
Correct, but it was that Scale uses snapshots as a helper in making a backup that was said to make it not agentless. A snapshot alone is not a backup. But Scale, like Veeam, uses snapshots as part of the backup process. As do all agentless systems.
The problem was that saying because snapshots can't be used and still be agentless would make all agentless products... not agentless by that definition, even Veeam.
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@scottalanmiller said in What Is an Agentless Backup:
@obsolesce said in What Is an Agentless Backup:
Agentless means the backup software is not installed on the VM. Agentless backups are not snapshots, but agentless backups do their backup with the help of snapshots.
"agentless backup" does not equal "snapshot"... rather, agentless backups are created with the help of snapshots, but the backup is not a snapshot.
Correct, but it was that Scale uses snapshots as a helper in making a backup that was said to make it not agentless. A snapshot alone is not a backup. But Scale, like Veeam, uses snapshots as part of the backup process. As do all agentless systems.
The problem was that saying because snapshots can't be used and still be agentless would make all agentless products... not agentless by that definition, even Veeam.
Oh I took how you said it the wrong way. I gotcha now.
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@obsolesce said in What Is an Agentless Backup:
@scottalanmiller said in What Is an Agentless Backup:
@obsolesce said in What Is an Agentless Backup:
Agentless means the backup software is not installed on the VM. Agentless backups are not snapshots, but agentless backups do their backup with the help of snapshots.
"agentless backup" does not equal "snapshot"... rather, agentless backups are created with the help of snapshots, but the backup is not a snapshot.
Correct, but it was that Scale uses snapshots as a helper in making a backup that was said to make it not agentless. A snapshot alone is not a backup. But Scale, like Veeam, uses snapshots as part of the backup process. As do all agentless systems.
The problem was that saying because snapshots can't be used and still be agentless would make all agentless products... not agentless by that definition, even Veeam.
Oh I took how you said it the wrong way. I gotcha now.
Literally every conversation @scottalanmiller and I have had for like...4 years?
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@scottalanmiller said in What Is an Agentless Backup:
@obsolesce said in What Is an Agentless Backup:
Agentless means the backup software is not installed on the VM. Agentless backups are not snapshots, but agentless backups do their backup with the help of snapshots.
"agentless backup" does not equal "snapshot"... rather, agentless backups are created with the help of snapshots, but the backup is not a snapshot.
Correct, but it was that Scale uses snapshots as a helper in making a backup that was said to make it not agentless. A snapshot alone is not a backup. But Scale, like Veeam, uses snapshots as part of the backup process. As do all agentless systems.
The problem was that saying because snapshots can't be used and still be agentless would make all agentless products... not agentless by that definition, even Veeam.
Comparing the Scale "snapshot" vs Veeam "snapshot" is an apples-orange comparison.
2nd paragraph, page 4 of the whitepaper says:
"Snapshots alone do not make a backup, even though they are extremely useful for local recovery of data from a number of operational disasters. For a true backup strategy, snapshots must be replicated onto another device, preferably at another site."Do you need another Scale device on the other end or not?
With Veeam (in a non-Scale enviroment), I can send the "snaphots/backups" (or whatever you want to call them) to a generic server/NFS/SMB share etc.
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@fateknollogee It's not required, but it is the design in a lot of the cases that I've seen.
3 host Scale system, with 2 at one location, and the last in a remote location.
Nothing in the Scale Design requires you to use this approach, you can setup Veeam or some other such solution and backup your VMs to a cloud if you wanted too.
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@dustinb3403 said in What Is an Agentless Backup:
Nothing in the Scale Design requires you to use this approach, you can setup Veeam or some other such solution and backup your VMs to a cloud if you wanted too.
If you go the Veeam route, would that not make it agent-based?
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@fateknollogee Whatever requirements you had would determine that. I was simply providing an example.
With Scale you can backup directly to a remote IIRC from the demo that I saw.
Paging @ScaleLegion
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@fateknollogee Well if that's the case I've been using agentless backups and didn't even know it lol
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I dont get the controversy here. Every single agentless backup uses snapshots, always has. Veeam, Unitrends, etc. How else could they work?
edit: For example, I can do a snapshot in XS/xcp, then export that snapshot. That is a real agentless backup. This is exactly the same process Unitrends uses, with a bit of flair added on like dedup and some other stuff like automation. -
@scottalanmiller said in What Is an Agentless Backup:
@fateknollogee said in What Is an Agentless Backup:
I don't even think the Scale guys could/would make that claim.
They don't in their whitepaper, but might as well, as they state that for special cases and workloads that agent-based would be an alternative to the built-in backup system. As agentless is the only alternative to agent-based, and built in platform backups are called agentless, they've made it clear that that is what they are considering it, which they should, as that is clearly what it is.
https://www.scalecomputing.com/documents/white-papers/white_papers_backup_hc3.pdf
They can take a snapshot and replicate it somewhere else. That isn't really revolutionary in and of itself (EMC had storage arrays that could do this in the 90's). One challenge to this is what are you recovering?
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does the application require being put in a backup ready state? (Does the snapshot system support running pre-freeze and post, thaw scripts in the guest to accomplish this?). more importantly is this something I"m going to manually have to do for each application, or does the backup software detect and have awareness of how to do this and report on success/failure?
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Agentless backups that just block level clones may be useful for some things (Image level restore of an OS drive) but there are other things people often look for. Support for file level, or application level (Brick level sometimes called) restores? Index's built to make the search for that possible? the ability to "search" all the snaps without having to mount them (Veeam Array offload snap protection with Nimble as an example) can mean the difference between 5 minutes, and hours of fighting with an application to get an export of a schema to get some things restored.
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Testing. Can the Backup and DR platform perform fully isolated testing of recovery (Build an isolated shadow network that's segmented, perform application and service checks). This is where the DR/BC software gets pretty nifty and advanced on making runbook testing easy.
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Does the application have distributed state? If so you may need to snapshot and quiescent and stun a GROUP of VM's at the same time. There's some real devil in the details with this stuff, but new Scale-out apps this is also a concern.
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@momurda said in What Is an Agentless Backup:
I dont get the controversy here. Every single agentless backup uses snapshots, always has. Veeam, Unitrends, etc. How else could they work?
edit: For example, I can do a snapshot in XS/xcp, then export that snapshot. That is a real agentless backup. This is exactly the same process Unitrends uses, with a bit of flair added on like dedup and some other stuff like automation.This is actually incorrect. There have been agentless systems that can mirror data without using a snapshot by leveraging write splitting technology. RecoveryPoint was an early one in the physical layer (and similar storage virtualization engines). VAIO based replication (RP4VM's, Veritas) also can replicate without a snapshot as the API's allow for write splitting to occur at the hypervisor layer giving you access to a "journal" and window you can recover from.
You may use snapshots, or scripts to stun applications WITH these technologies to improve consistency of recovery, but they have existed for a long time and can run without snapshots.
