Running XenServer from a USB Drive
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@Ajin said in Running Xen Server from a USB Drive.:
Tried the same and created a USB Drive with Xen 7 .
But when trying to boot from it failes,Any suggetions for making a live Xenserver 7 from a 32 Gig USB Drive .
Make sure you have the USB as an active boot device in BIOS, for XS7 if you arent upgrading, you need a 32GB USB drive at minimum. Just install and go.
Nothing special required.
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I have a workstation (Dell T3500) that runs XS7 now, and it will only boot from the rear USB ports.
Double check the BIOS boot options maybe.
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@Ajin said in Running Xen Server from a USB Drive.:
Tried the same and created a USB Drive with Xen 7 .
But when trying to boot from it failes,Any suggetions for making a live Xenserver 7 from a 32 Gig USB Drive .
You need at least 46GB to install fresh. Try a 64GB stick.
Otherwise it will not show up on the install screen.
Or are you upgrading directly from 6.5 on USB? I was a little confused by your post.
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@BRRABill said in Running Xen Server from a USB Drive.:
@Ajin said in Running Xen Server from a USB Drive.:
Tried the same and created a USB Drive with Xen 7 .
But when trying to boot from it failes,Any suggetions for making a live Xenserver 7 from a 32 Gig USB Drive .
You need at least 46GB to install fresh. Try a 64GB stick.
Otherwise it will not show up on the install screen.
Or are you upgrading directly from 6.5 on USB? I was a little confused by your post.
Yeah I thought I recalled someone saying that fresh installs now required the use of a 64 GB stick/card.
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@Dashrender said in Running Xen Server from a USB Drive.:
@BRRABill said in Running Xen Server from a USB Drive.:
@Ajin said in Running Xen Server from a USB Drive.:
Tried the same and created a USB Drive with Xen 7 .
But when trying to boot from it failes,Any suggetions for making a live Xenserver 7 from a 32 Gig USB Drive .
You need at least 46GB to install fresh. Try a 64GB stick.
Otherwise it will not show up on the install screen.
Or are you upgrading directly from 6.5 on USB? I was a little confused by your post.
Yeah I thought I recalled someone saying that fresh installs now required the use of a 64 GB stick/card.
That was probably me.
Don't you remember your trip out to the store to pick up a USB stick?
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@BRRABill said in Running Xen Server from a USB Drive.:
@Dashrender said in Running Xen Server from a USB Drive.:
@BRRABill said in Running Xen Server from a USB Drive.:
@Ajin said in Running Xen Server from a USB Drive.:
Tried the same and created a USB Drive with Xen 7 .
But when trying to boot from it failes,Any suggetions for making a live Xenserver 7 from a 32 Gig USB Drive .
You need at least 46GB to install fresh. Try a 64GB stick.
Otherwise it will not show up on the install screen.
Or are you upgrading directly from 6.5 on USB? I was a little confused by your post.
Yeah I thought I recalled someone saying that fresh installs now required the use of a 64 GB stick/card.
That was probably me.
Don't you remember your trip out to the store to pick up a USB stick?
Yes, yes i do..
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@BRRABill : Will give it a try again with 64 Gig disk.Currently my xen 6.5 is on an HP server Inbuilt HDD. I am planning of upgrading to Xen 7 & and also move it to usb.
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@travisdh1 :Yes tried that too , Dint help
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What's your current status on this? Issues with the install itself?
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yes , I am stuck with running Xen from the USB . still working on it .
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@Ajin said in Running Xen Server from a USB Drive.:
yes , I am stuck with running Xen from the USB . still working on it .
What is the error that you are getting?
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@Ajin said in Running Xen Server from a USB Drive.:
@BRRABill : Will give it a try again with 64 Gig disk.Currently my xen 6.5 is on an HP server Inbuilt HDD. I am planning of upgrading to Xen 7 & and also move it to usb.
The book I'm reading specifically says not to install to USB stick...
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@Dashrender said in Running Xen Server from a USB Drive.:
@Ajin said in Running Xen Server from a USB Drive.:
@BRRABill : Will give it a try again with 64 Gig disk.Currently my xen 6.5 is on an HP server Inbuilt HDD. I am planning of upgrading to Xen 7 & and also move it to usb.
The book I'm reading specifically says not to install to USB stick...
Did they give a reason?
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Yeah because the lack of trim support will slow the disk down a lot. And lack or wear leveling.
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@Dashrender said in Running Xen Server from a USB Drive.:
Yeah because the lack of trim support will slow the disk down a lot. And lack or wear leveling.
That makes some weird assumptions..... like that speed is relevant and that you will have writes sent to the USB stick. So based on that reasoning, I think that it is a false recommendation. It's the same as all the recommendations ever... don't run Xen (or anything) from USB unless you make it non-writing. Or at least non-writing for things like logs.
So given that they explained why and it obviously doesn't apply. We can safely take that as a null recommendation.
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@scottalanmiller I Have installed the OS to a Usb stick , and when trying to boot up with it , The usb stick with the os is not being detected, Tried this with multiple machines and usb sticks
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@scottalanmiller : Now something interesting happened, The USB stick got corrupted after multiple testing with the os installation.Getting a new one now
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@Ajin said in Running Xen Server from a USB Drive.:
@scottalanmiller : Now something interesting happened, The USB stick got corrupted after multiple testing with the os installation.Getting a new one now
That's common if you don't have a solid plan for getting the writes to go elsewhere. The logging kills the USB very quickly. You need to be set up for read only or the USB is not even an option.
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USB boot is not for the faint of heart. It's a great idea and I promote it heavily, but with Xen it is an expert only option. You want to really know what you are doing before going that route.
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@Ajin said in Running Xen Server from a USB Drive.:
@scottalanmiller : Now something interesting happened, The USB stick got corrupted after multiple testing with the os installation.Getting a new one now
Common problem with removable flash storage like SD-Cards or USB thumb drives. They often do not feature wear leveling like a modern SSD. The SD card spec does not say a single word about wear leveling for example.
What @scottalanmiller is referring to is that you need some in-depth knowledge about partitioning, filesystems and overall Linux / Unix to create something solid. You would need to redirect logs (rsyslog for example), lock and pid files (ramdisk), /tmp (ramdisk) and a lot more to create a read-only solution that does not kill your flash with little writes. Best would be to implement something like unionfs or squashfs (AFAIK deprecated and replaced by unionfs) where you have a virtual layer between your storage and every write operation. Such a write operation could be mapped to a ramdisk at the filesystem level with unionfs for example.
But even with such a solution, you need to work around some problems. How would you change your configuration for example on a filesystem that is virtually read-only?
