some EWF RAM questions

[Yaron Maor]

Hi,

I have an Image on a 256MB NTFS compressed partition on a flash DOM. after
FBA I'm left with about 50MB free disk space. I use EWF with RAM overlay. my
questions are:
1. can I use a Pagefile with EWF?
2. if Yes, is it possible that the paging process willl fillup my RAM
overlay space.
3. does the NTFS compression have any side-effects on the amount of writes
in the overlay space?
4. what about EWF and cloning... do I need to enable EWF and then run
Fbreseal?
I preffer using a PF for better performance when running multiple
applications, and I'm worried about losing the PF benefits and losing RAM
because of the EWF overlay.

As you can see, I'm new to EWF so I'd appreciate any useful tips.

thanks,

YaronM

 

[Slobodan Brcin \(eMVP\)]

Yaron,

1. You can. But make sure that pagefile is located on partition that is not protected by EWF. There are some problems with pagefile
on partition protected by EWF. I have still not found enough time to play with this. We have discussed this before in this NG.
http://msdn.microsoft.com/embedded/community/community/tips/xp/renamert/default.aspx

2. Read the 1. You must use unprotected partition.
3. No. Since EWF protect partition so what FS is doing above is not concern of EWF. Make sure that you disable as many NTFS log
options as you can since it like very mush to internally log things.
http://msdn.microsoft.com/embedded/community/community/tips/xp/ramewf/default.aspx
4. Make sure that you commit and gracefully shutdown after you call fbreseal.

http://msdn.microsoft.com/embedded/community/community/tips/xp/


Best regards,
Slobodan

 

[Slobodan Brcin \(eMVP\)]

One more thing that I forgot to ask,

I preffer using a PF for better performance when running multiple
applications, and I'm worried about losing the PF benefits and losing RAM
because of the EWF overlay.

What does this mean exactly, what performance loss.
Without PF system must work with equal speed or faster. Catch is that you must have enough of RAM otherwise it will fail loading
applications, etc.

Also DO NOT USE PF ON FLASH DEVICE. You can use it only if you need some of performance counters functions available, and in no
other circumstance.

Best regards,
Slobodan

 

[Yaron Maor]

Hi Slobodan,

thanks for the info. I will read it carefully.
regarding the performance- we're using our build for running multiple
RDP/ICA connections as a time (using published applications, Jetro
Cockpit..).
when enabling PF I was able to stress the machine far beyond the amount of
physical RAM installed (for example 10apps concurrently without vs. 20apps
with).
why shoudln't I use PF with flash? I know about the CF write cycles, but I
thought when using an ATA DOM that it is ok. or am I wrong..?

thanks,

YaronM

 

[Slobodan Brcin \(eMVP\)]

Hi Yaron,

why shoudln't I use PF with flash? I know about the CF write cycles, but I
thought when using an ATA DOM that it is ok. or am I wrong..?

All flash devices have some limit of allowed writes. Depending on wear leveling algorithm it can significantly prolong device life,
but even then it have some limits.

What is the size of DOM?
Why don't you use smaller DOM device and larger RAM. You would gain here in reliability and speed as well?

Best regards,
Slobodan

 

[KM]

why shoudln't I use PF with flash? I know about the CF write cycles, but I

All flash devices have some limit of allowed writes. Depending on wear leveling algorithm it can significantly prolong device life,
but even then it have some limits.

What is the size of DOM?
Why don't you use smaller DOM device and larger RAM. You would gain here in reliability and speed as well?

And it may be even cheaper

KM