JVM and S2Sv2

[Phoenix32]

Okay, so here is where I get to look stupid (well, more so than normal)...


I keep seeing you guys talk about JVM. I also see S2Sv2 as a download on the Adaptec site. I have NO CLUE as to what either of these are, what they do, how to install, what they are used or needed for, etc etc etc... Would someone like to, or at least be willing to, enlighten me, and maybe others on this? Something for the Wiki as well maybe? Thanks in advance







NOTE: In case you guys have not figured it out yet (and even care), I am/was a professional Hardware and Electronics guy, not a Software or IT type.

[jontz]

JVM stands for Java Virtual Machine. Java is a platform independant execution evironment. In other words, Java will run on any platform and any processor architecture. Most programs compile source code directly into machine code and then run it on the specific platform it was designed for. JVM creates a virtual Java processor and then turns Java bytecode into machine language. Because it creates this virtual processor, it can run on anything. I the snap servers case, you can run things like SSL encryption or even devolp a custom application.

A good example of this would be if you were trying to establish a socket connection between two different computer platforms. Establishing a socket connection requires and operating system call. Obviously, Windows and Mac OS handle sockets in different ways. JVM acts as a translator to allow these two OS's to play nice. That's why you see all this garbage about Java Script on the internet. If it is written in Java, it will run on anything instead of the web site developer having to write different code for each computer type that visits the web site.

Hope this helps a little!

[re3dyb0y]

S2S is Server 2 Server

Originally used for Snap Server to Snap Server syncronisation

V2 has changed the idea completely

You are now able to syncronise to other pc's


Are you after a copy?

[Phoenix32]

Originally Posted by jontz

JVM stands for Java Virtual Machine.

Hope this helps a little!

Hmmm, okay, I know what Java is and now know that JVM is Java inside the Snap (so it can run Java Scripts), but one more thing then. People keep talking about it being installed, unless I misunderstood. I thought Java was built into the Snap OS all along? If not, then what do you have to install to get the JVM, and where do you get that?

[Phoenix32]

Originally Posted by re3dyb0y

You are now able to syncronise to other pc's

Are you after a copy?

Never hurts to have

[blue68f100]

The JVM installation is the same as an OS upgrade. Just select the Snap_JVM.sup file instead of the OS file.

[Parity Error]

Originally Posted by Phoenix32

Hmmm, okay, I know what Java is and now know that JVM is Java inside the Snap (so it can run Java Scripts)...

Java and Javascript share only one thing -- name confusion......

[Phoenix32]

Originally Posted by blue68f100

The JVM installation is the same as an OS upgrade. Just select the Snap_JVM.sup file instead of the OS file.

And where might I find this Snap_JVM.sup file? I have not seen it on the adaptec site at all. Also, are there different versions needed for different OS versions?

[Phoenix32]

Originally Posted by Parity Error

Java and Javascript share only one thing -- name confusion......

No doubt...

[re3dyb0y]

Originally Posted by Phoenix32

And where might I find this Snap_JVM.sup file? I have not seen it on the adaptec site at all. Also, are there different versions needed for different OS versions?

Often included in the archives where you get manuals and assist also

[blue68f100]

Originally Posted by Phoenix32

And where might I find this Snap_JVM.sup file? I have not seen it on the adaptec site at all. Also, are there different versions needed for different OS versions?

When you unpack the zip/rar file for the OS it is included.

[Phoenix32]

Originally Posted by blue68f100

When you unpack the zip/rar file for the OS it is included.

I see, said the blind man. Since I had not updated to 4.0.830/860 yet, I had not seen it. The rar I had for 3.4.805 did not have this/these. Thank you for clearing that up.

[blue68f100]

One other interesting note for JVM. You are required to have a min of 24 meg of free ram. That is what required for the deamon to load. The reason it will only run on snaps with a min of 128 meg, and why the 256 meg push.

[Phoenix32]

Originally Posted by blue68f100

One other interesting note for JVM. You are required to have a min of 24 meg of free ram. That is what required for the deamon to load. The reason it will only run on snaps with a min of 128 meg, and why the 256 meg push.

Which opens yet one more series of questions as always. What are the memory options/limits for the various snap servers, including my 4000? 256MB? 512MB? 1GB? ECC? Registered? Unbuffered? non ECC? Only single sided SDRAM? etc etc etc?

[blue68f100]

The actual spec is PC 66 DIMM's, with PC 100 being backward compatiable. Which means the max size is 256 meg.

If I recall the users have been using low profile dimm.


I guess we should be keeping a list of which mfg and chips are compatiable.
Hint:Hint:Hint

[jontz]

Snaps seem to like low density RAM as opposed to the newer high density stuff. Snap 4100 won't see anything more than 256MB, if you put a 512 in, you still get 256.

[Phoenix32]

Makes me wonder a little...

A lot of the older Pentium thru Pentium III boards and chipsets were sensitive to the array of chips on the DIMM (i.e. 64x8 vs 32x16) as well as if it was single or double sided. I have seen boards/chipsets that "seemed" to not go over 128 or 256 meg sticks and yet if a proper stick was found (array and # of sides) would do the next step larger. I just wonder if a Single Sided 512 would work? I wish I had one to test with, but I don't, sorry.

So, with a 4000 using software RAID 5, 4x250GB or 4x320GB drives, and say JVM installed, is a 256 DIMM enough to keep the system from getting bogged down? Slow as in restores/formats that take forever and a day or whatever.

[re3dyb0y]

Originally Posted by blue68f100

The actual spec is PC 66 DIMM's, with PC 100 being backward compatiable. Which means the max size is 256 meg.

If I recall the users have been using low profile dimm.


I guess we should be keeping a list of which mfg and chips are compatiable.
Hint:Hint:Hint

Wonder who thats aimed at.....



If someone gets me the stuff together i will get it done

[blue68f100]

First 2 guesses don't count......

Besides you had a call for data. I don't recall but a couple of users posting what ram chips they used and where they got it from. The last one used Kingston ram pulled from an old PC, works for me. I have the spec sheet that a tech sent to me when I asked about ram for my 2000.

[jaylweb]

Okay, I know how much memory is in my Snap server, but how to I see how much is recognized? I've been all through the web interface and I just don't see memory listed anywhere.

[jontz]

Go to //(snapserver)/config/debug and type in "debug memory" (no quotes). That will tell you how much is recognized in your snap, and how it is being used.

[jaylweb]

I just came back to post that I figured it out. LOL

[jontz]

See? You don't even need us...