100GB RAM disk failing at boot

stenrulz

100GB RAM disk failing at boot 07 October 2014, 22:40

Registered: 10 years ago
Posts: 17

Hello,

I have created a 100 GB image on my SSD that is selected to load at start-up. For some reason it does not load automatically, works fine manually. This process takes up to 6 minutes, could i be hitting one of your static timeouts? Could you please investigate? I would like to use this ram drive for all user profiles, programs, etc.

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Andrew

Re: 100G RAM Disk at Boot Failing 08 October 2014, 08:25

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Registered: 18 years ago
Posts: 3 555

How much RAM does this system have (and what OS)?

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stenrulz

Re: 100G RAM Disk at Boot Failing 08 October 2014, 10:18

Registered: 10 years ago
Posts: 17

140GB of RAM and Windows 2012 R2

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stenrulz

Re: 100G RAM Disk at Boot Failing 08 October 2014, 11:01

Registered: 10 years ago
Posts: 17

I have done some more testing to hopefully help workout here the issue is.

- Issue still occurs if not loading or saving to disk
- 64000MB ram drive issue occurs
- 32000MB ram drive works on boot

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Andrew

Re: 100G RAM Disk at Boot Failing 08 October 2014, 11:40

Admin
Registered: 18 years ago
Posts: 3 555

Thank you, we have been able to reproduce the issue, though the reason is yet unclear. A 100 GB RAM disk seems to be created fine, but 150 GB does not.

The tests that you have done with 32 GB and 64 GB, were they with an associated image file?
If so, could you please also try creating a RAM disk of the same size, but without an image (and then go up in size until they start failing to mount at boot)?

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stenrulz

Re: 100G RAM Disk at Boot Failing 08 October 2014, 11:48

Registered: 10 years ago
Posts: 17

No disk image attached to the 64GB or 32GB test.

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stenrulz

Re: 100G RAM Disk at Boot Failing 08 October 2014, 12:19

Registered: 10 years ago
Posts: 17

Please see the below test outcomes. Hopefully this should be small enough ram disk size for quick tests.

1)
30GB - worked
40GB - failed
30GB on disk - failed
2)
40GB - failed
30GB on disk - worked
3)
40GB - failed
4)
35GB - worked

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stenrulz

Re: 100G RAM Disk at Boot Failing 08 October 2014, 19:09

Registered: 10 years ago
Posts: 17

Andrew,

Please let me know if you need any more information. 40GB is quite a low limit for the issue to occur, hopefully this should allow for quick diagnostics.

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Andrew

Re: 100GB RAM disk failing at boot 08 October 2014, 19:21

Admin
Registered: 18 years ago
Posts: 3 555

We have been able to reproduce this issue and no further information is needed at this stage. So far it looks like the problem is caused by the time it takes to allocate a large RAM block (not the size of the disk). Perhaps the kernel cancels the RAM disk creation and continues to boot after a timeout. We need some time to add logging and see when and how this happens.

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stenrulz

Re: 100GB RAM disk failing at boot 10 October 2014, 11:48

Registered: 10 years ago
Posts: 17

OK, great. Please let me know if you need any any testing done with any dev build.

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stenrulz

Re: 100GB RAM disk failing at boot 15 October 2014, 19:28

Registered: 10 years ago
Posts: 17

Any progress?
Thanks in advance.

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stenrulz

Re: 100GB RAM disk failing at boot 25 October 2014, 11:36

Registered: 10 years ago
Posts: 17

Andrew, do you think this is going to be a hard issue to resolve?

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Ramboy

Re: 100GB RAM disk failing at boot 27 October 2014, 01:44

I can imagine it being hard to solve, mainly because he would need a system which allows him a 100 GB Ramdisk.

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Andrew

Re: 100GB RAM disk failing at boot 27 October 2014, 11:31

Admin
Registered: 18 years ago
Posts: 3 555

Sorry guys, we are still working on it. Please allow us 2-3 more days and we will provide more information on this and a fix.

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Andrew

Re: 100GB RAM disk failing at boot 04 November 2014, 18:08

Admin
Registered: 18 years ago
Posts: 3 555

So far it seems that not all physical memory is available at the boot stage when a RAM disk is created. We're trying to find another way to allocate physical memory for large RAM disks to work. Stay tuned smile

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stenrulz

Re: 100GB RAM disk failing at boot 08 November 2014, 10:46

Registered: 10 years ago
Posts: 17

Thank you for the update.

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stenrulz

Re: 100GB RAM disk failing at boot 12 January 2015, 23:11

Any update?

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Andrew

Re: 100GB RAM disk failing at boot 13 January 2015, 19:17

Admin
Registered: 18 years ago
Posts: 3 555

No, sorry. Still haven't found a good way to allocate this much memory on startup sad

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