Converting to a virtual environment
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@BRRABill said in Converting to a virtual environment:
But I am assuming since Citrix says to take regular backups of the host, perhaps it is needed. But perhaps not.
I thought that they said not to take them.
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@scottalanmiller See our prior discussion here.
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@scottalanmiller said in Converting to a virtual environment:
@BRRABill said in Converting to a virtual environment:
But I am assuming since Citrix says to take regular backups of the host, perhaps it is needed. But perhaps not.
I thought that they said not to take them.
No they said to reinstall, but then proceed to say to take very regular backups of the host.
Here's the whole thing. (NOTE: this can be done with using the CLI as well._
*Citrix recommends that, whenever possible, you leave the installed state of XenServer hosts unaltered. That is,
do not install any additional packages or start additional services on XenServer hosts, and treat them as if they
are appliances. The best way to restore, then, is to reinstall XenServer host software from the installation media.
If you have multiple XenServer hosts, the best approach is to configure a TFTP server and appropriate answerfiles
for this purpose (see the XenServer Installation Guide).
For VMs, the best approach is to install backup agents on them, just as if they were standard physical servers.
For Windows VMs, as of this release we have tested CA BrightStor ARCserve Backup, and Symantec NetBackup
and Backup Exec.
For more information about backup tools tested, best practices, and backups in general, see the Citrix Knowledge
Base.
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Citrix recommends that you frequently perform as many of the following backup procedures as possible to
recover from possible server and/or software failure.To backup pool metadata
- Run the command:
xe pool-dump-database file-name=<backup> - Run the command:
xe pool-restore-database file-name=<backup> dry-run=true
This command checks that the target machine has an appropriate number of appropriately named NICs,
which is required for the backup to succeed.
To backup host configuration and software
• Run the command:
xe host-backup host=<host> file-name=<hostbackup>
Note:
• Do not create the backup in the control domain.
• This procedure may create a large backup file.
• To complete a restore you have to reboot to the original install CD.
• This data can only be restored to the original machine.* - Run the command:
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wow .... errr... have I opened-up a can of worms here ?
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@PRPL said in Converting to a virtual environment:
wow .... errr... have I opened-up a can of worms here ?
Yeah maybe this is a time for a fork!
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@PRPL said in Converting to a virtual environment:
wow .... errr... have I opened-up a can of worms here ?
And also backed up the statement of @JaredBusch
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Further on there is this. Perhaps this answers your question, @scottalanmiller
"Because the privileged control domain is best left as installed, without customizing it with
other packages, Citrix recommends that you set up a network boot environment to cleanly
perform a fresh installation from the XenServer media as a recovery strategy. In many cases
you will not need to backup the control domain at all, but just save the pool metadata (see
Section 8.9.1, “Backing up Virtual Machine metadata”). This backup method should always
be considered complementary to backing up the pool metadata."I take this as, if you leave it "as installed" there is no need to backup the host.
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@scottalanmiller said in Converting to a virtual environment:
@PRPL said in Converting to a virtual environment:
I did look @ the free Starwind Virtual SAN, but from what I read, I understand that the free version will allow only storage and not compute, on the same host... That's allowed, only in the paid version... ??
I've never heard of that limitation. that would be a new and surprising one. I'm quite confident that you can put your storage on your compute nodes.
Checking with @KOOLER @StarWind_Software
I'm making this statement, based on my understanding of the Free vs Paid document, found on https://www.starwindsoftware.com/whitepapers/free-vs-paid.pdf
Please look @ the comparison on the second-last page of this PDF... It says, next to Deployment Scenarios , that Hyperconvergence, is available only for Certain User Statuses (Check Status)
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@BRRABill said in Converting to a virtual environment:
@PRPL said in Converting to a virtual environment:
wow .... errr... have I opened-up a can of worms here ?
And also backed up the statement of @JaredBusch
Or mine... are you carrying Windows complexities into the simple XenServer world?
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@PRPL said in Converting to a virtual environment:
@scottalanmiller said in Converting to a virtual environment:
@PRPL said in Converting to a virtual environment:
I did look @ the free Starwind Virtual SAN, but from what I read, I understand that the free version will allow only storage and not compute, on the same host... That's allowed, only in the paid version... ??
I've never heard of that limitation. that would be a new and surprising one. I'm quite confident that you can put your storage on your compute nodes.
Checking with @KOOLER @StarWind_Software
I'm making this statement, based on my understanding of the Free vs Paid document, found on https://www.starwindsoftware.com/whitepapers/free-vs-paid.pdf
Please look @ the comparison on the second-last page of this PDF... It says, next to Deployment Scenarios , that Hyperconvergence, is available only for Certain User Statuses (Check Status)
that does appear to say that, but goes against hundreds of posts from the company so I think that this might be outdated.
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@BRRABill said in Converting to a virtual environment:
Further on there is this. Perhaps this answers your question, @scottalanmiller
"Because the privileged control domain is best left as installed, without customizing it with
other packages, Citrix recommends that you set up a network boot environment to cleanly
perform a fresh installation from the XenServer media as a recovery strategy. In many cases
you will not need to backup the control domain at all, but just save the pool metadata (see
Section 8.9.1, “Backing up Virtual Machine metadata”). This backup method should always
be considered complementary to backing up the pool metadata."I take this as, if you leave it "as installed" there is no need to backup the host.
AND that you should leave it "as installed".
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@scottalanmiller said
Or mine... are you carrying Windows complexities into the simple XenServer world?
His statement being...
"some of the biggesest threads on XS on this forum to see how unstable it is for people that do not fully know what they are doing" -
@BRRABill said in Converting to a virtual environment:
@scottalanmiller said
Or mine... are you carrying Windows complexities into the simple XenServer world?
His statement being...
"some of the biggesest threads on XS on this forum to see how unstable it is for people that do not fully know what they are doing"And my sentiment being that it was only people doing non-standard things and those following the instructions and keeping it simple (with the exception of needing to skip the SD piece) it's rock solid. Is anyone having issues with normal usage? I'm not aware of a stability concern. And also I pointed out that the things that cause the "instabilities" as they are seen will do the same things on Hyper-V... so the issue isn't about XenServer, it's about people pushing boundaries on test boxes to see what breaks and where.
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@scottalanmiller said
And my sentiment being that it was only people doing non-standard things and those following the instructions and keeping it simple (with the exception of needing to skip the SD piece) it's rock solid. Is anyone having issues with normal usage? I'm not aware of a stability concern. And also I pointed out that the things that cause the "instabilities" as they are seen will do the same things on Hyper-V... so the issue isn't about XenServer, it's about people pushing boundaries on test boxes to see what breaks and where.
I ain't touchin' nothing' no mores.
(Though I am going to keep testing my /var/log theories.)
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@scottalanmiller said in Converting to a virtual environment:
At 90 minutes, a good backup system can almost always restore your VMs in that window. It require the backup system to be able to push a restore that quickly AND your servers to be able to ingest a restore that quickly. So a lot of ifs, but it can be done and might be the cheapest path to your goal. You still use virtualization to make the "magic" happen on this, but using the storage of the two nodes to handle this is only one option, using the backup system to get rapid backups and rapid restores is a very viable approach when you don't need to recover "in seconds."
So, you're saying that one can backup all VMs(Data n all), onto an external media, and when the Primary host goes down, the VMs can be restored onto the secondary host ...
Our current backup scenario is rather straight-forward... We use a backup Software (called Easus) to perform daily incremental backups (at EOD), with 1 weekly full-backup. This has worked well for us (Tried n Tested)
So, going by what you're suggesting, can we incrementally (Every 30 mins) backup the VMs to the same USB drive, but this time, using a VM specific backup solutions such as Veeam Free...
Also, with something like Veeam Free, does the backup source host & restore target host have to be the same ? While restoring, can I just select another host as the restore target, and boom, it'd be up n running ?
Also, how long would be take to restore a 1TB VM ?
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@BRRABill said in Converting to a virtual environment:
@scottalanmiller said
And my sentiment being that it was only people doing non-standard things and those following the instructions and keeping it simple (with the exception of needing to skip the SD piece) it's rock solid. Is anyone having issues with normal usage? I'm not aware of a stability concern. And also I pointed out that the things that cause the "instabilities" as they are seen will do the same things on Hyper-V... so the issue isn't about XenServer, it's about people pushing boundaries on test boxes to see what breaks and where.
I ain't touchin' nothing' no mores.
(Though I am going to keep testing my /var/log theories.)
It's good for testing. Just don't compare issues when you are trying to break things with stability issues. Or if you do, test them equally across platforms. I know of no one testing Hyper-V in a similar fashion.
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@PRPL said in Converting to a virtual environment:
So, you're saying that one can backup all VMs(Data n all), onto an external media, and when the Primary host goes down, the VMs can be restored onto the secondary host ...
Yes, that's the idea. If the backup server, network and host node are fast enough, you can restore in 90 minutes (or less.)
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@PRPL said in Converting to a virtual environment:
Also, with something like Veeam Free, does the backup source host & restore target host have to be the same ? While restoring, can I just select another host as the restore target, and boom, it'd be up n running ?
No, does not need to be the same. Although Veeam Free will leave you without some of the things that you want. Unitrends or XenOrchestra will likely do a better job for you here when trying to do this for free.
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@PRPL said in Converting to a virtual environment:
Also, how long would be take to restore a 1TB VM ?
Depends on a lot of things. This is an actual 1TB of data on the VM, not the size before compression?
Let's start with the network bottleneck.. If your network for backups (and restores) is 100% dedicated, the pretty much the fastest possible 1TB restore will be two and a half hours on a GigE interface.
On USB 3 this could be cut down to 47 minutes.
On 10GigE it might be as low as 15 minutes.
On 40GigE, Infiniband or whatever, in theory, it could be even faster. But that is only the network portion and assumes 100% efficiency with 100% available capacity.
