Good product, good people. What is does is allow you to replace part of = your mechanical rotating magnetic disk storage with a solid state disk = storage. So, you can put things like your page file (or part of it) on a = drive that is much faster than an ordinary disk drive, and almost as = fast as memory. Since you are not reducing the amount of RAM available = to applications when you do this, this is not a case of robbing Peter to = pay Paul. It is however, quite a bit more expensive, than for example = our product TScale, which works by reducing the number of things that = have to be kept in the page file. Cheers,=20 Bernd Harzog CEO RTO Software, Inc. bernd.harzog@xxxxxxxxxxx 678-455-5506 x701 www.rtosoft.com -----Original Message----- From: Steve Snyder [mailto:steven_snyder@xxxxxxxxx]=20 Sent: Sunday, February 15, 2004 11:21 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: RAMDISK Or for those of you who recall Digital's non-voltile ramdrives for VAXs, here's the modern equivalent (they claim to increase a citrix box's scalabilty, so I'm interested to read what Bernd thinks about it) http://www.tigicorp.com/tigijet.htm fwiw - I used to use ramdrives in the old days to increase compiling performance until disk-caching pretty much gave me the same advantage, which is why I think its largely unused these days --- Alexander Danilychev <teknica@xxxxxxxxxxx> wrote: > Bernd is right -- 32-bit memory addressing allows > access only 4 gigabytes of=20 > physical memory (2 GB for user addressable memory, > unless you are on Windows=20 > 2003 when you can bump it to 3GB at OS expense). > RAMDISK, as I understand,=20 > has access to kernel memory space. >=20 > I am not sure, however, I share Bernd's concerns - > techniques like "PAE x86"=20 > (this is where Joe's comment comes in) change the > memory addressing from=20 > 32-bit addressing mode to 64-bit addressing mode > (check interesting article=20 > http://www.microsoft.com/technet/treeview/default.asp?url=3D/technet/prod= technol/windowsserver2003/proddocs/techref/W2K3TR_pae_what.asp). >=20 > In other words, even on 32-bit OS/hardware using > RAMDISK sparingly should=20 > not create a problem. >=20 > In any event, RAMDISK can be used to force specific > apps, let say=20 > tracing/logging application, to run from RAMDISK and > collect data there=20 > (temporarily of course). Otherwise we might have > very little control=20 > regarding app data placement (memory versus disk) if > we have no access to=20 > the source code. >=20 > ALEX >=20 >=20 > >From: "Joe Shonk" <joe@xxxxxxxxxxxxxxxxxxx> > >Reply-To: thin@xxxxxxxxxxxxx > >To: <thin@xxxxxxxxxxxxx> > >Subject: [THIN] Re: RAMDISK > >Date: Sun, 15 Feb 2004 10:29:41 -0700 > > > >I'm not sure where you are getting that 4GB > limitation. > > > >Windows 2000 Server and Windows Server 2003 > Standard supports 4GB Max. > >Windows 2000 Advanced Server supports 8 GB Max > >Windows Server 2003 Enterprise Edition supports 32 > GB Max (x86 Based > >Processors) 64GB Max for the DataCenter Edition. > (again x86 bases) > > > >HP has 2xway Xeon servers that support 16 GB of > RAM, and 4xway Xeon servers > >that support 32-64G of RAM. > > > >Joe > > > >-----Original Message----- > >From: thin-bounce@xxxxxxxxxxxxx > [mailto:thin-bounce@xxxxxxxxxxxxx] On=20 > >Behalf > >Of Bernd Harzog > >Sent: Sunday, February 15, 2004 7:29 AM > >To: thin@xxxxxxxxxxxxx > >Subject: [THIN] Re: RAMDISK > > > >I would be very interested in knowing if anyone has > been able to use a =3D > >RamDisk in terminal server environment to any great > effect. Here my =3D > >concern. You have 4GB of addressable memory in > Windows NT/2000/2003 when =3D > >running on 32 bit chips. Let's say you have 4GB of > RAM on a server, and =3D > >an 8GB page file (12 GB of virtual memory). If you > take 512MG of RAM and =3D > >make a RAM disk, you may cause the OS to take 512MB > of stuff that was in =3D > >RAM in put it on the page file. In other words you > are simply robbing =3D > >Peter to pay Paul with no net gain. > > > >If someone has results that are different than what > I have outlined =3D > >above, I would be very interested to hear about it > > > >Best Regards, > > > >Bernd Harzog > >CEO > >RTO Software, Inc. > >bernd.harzog@xxxxxxxxxxx > >678-455-5506 x701 > >www.rtosoft.com > > > > -----Original Message----- > >From: Alexander Danilychev > [mailto:teknica@xxxxxxxxxxx]=3D20 > >Sent: Sunday, February 15, 2004 12:06 AM > >To: thin@xxxxxxxxxxxxx > >Subject: [THIN] RAMDISK > > > >Run into an interesting site regarding RAMDISK. > There might be =3D > >interesting=3D20 > >uses for Citrix related applications:=3D20 > >http://home.tiscali.be/ir006712/RAMDisk/RAMDisk.htm > > > >Based on Microsoft RAMDisk sample (Q257405). Code > for original "free"=3D20 > >version 1.0 is available here: > >http://codeguru.earthweb.com/system/RAMDisk_src.zip > > > >Free version or $10 for "extended" version 2.2. > > > >Here is some info from the site: > >"A RAMDisk acts as a virtual drive on your system. > It allows you to =3D > >create=3D20 > >directories, copy files to and from it, etc.... The > data however is not=3D20 > >written onto a hard disk, but remains purely stored > into a particular =3D > >part=3D20 > >of your RAM memory. Hard disks have mechanical > parts that allow to seek =3D > >to a=3D20 > >particular position on the magnetic storage media > and to read/write =3D > >data.=3D20 > >This make them relative lazy. A RAMDisk can read > and write the same data =3D > >to=3D20 > >upon 30-60 times faster than a hard disk ! However, > the data stored in =3D > >your=3D20 > >RAM is "volatile" : it disappears when you cut off > the power to the RAM=3D20 > >memory, with other words, if you turn off your > system. This applies to =3D > >the=3D20 > >content of the RAMDisk too !" > > > >ALEX __________________________________ Do you Yahoo!? Yahoo! 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