Developer Forum

+ User FidoNet address: 1:396/45
Hello all.

A few questions:

1. Can I boot from an HPFS partition and have other partitions
on the machine be JFS?

1A. I presume one cannot boot a JFS drive; correct?

2. What are the negative effects (if any) of this combination?

3. I presume that JFS handles large (in excess of 64GB)
partitions.(?)

4. What happens during boot when the machine does an
auto-chkdsk? Does OS/2 also check the JFS drives?

5. Can an HPFS drive be converted to JFS with something like
DFSee? Or should I move all the data off and then convert it?

6. Where does if IFS statement go in the config.sys? Before or
after the HPFS statement?

Thanks in advance!!

Best regards,
Marc
-+-timEd/2 1.10.y2k+
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Yes.


No. Some eCS Version can boot from JFS. I don't remember whether it is
eCS 2.0 or some earlier versions too.


You need more memory for the drivers and the cache. (The latter is a
real advantage unless you use HPFS386.)


It handles any size that the existing DASD drivers can handle.


That depends on your setting in the CONFIG.SYS.
I prefer to check only the boot drive automatically. All other volumes
are checked from the startup.cmd script in parallel by one task per
physical disk. This is many times faster, even with JFS.


Not that I know.


I would prefer that anyway. What if the tool does something wrong and
you realize it not until some years later as data damage to some rarely
used files.


That makes no difference. Only the Unicode drivers have to be loaded
before JFS.



Marcel

Yes


eCS ver 2 (in beta) now has bootable JFS


Uses slightly more memory


Yes, also large (in excess of 2 GB) files.


As long as you have config.sys setup right the JFS drives get chkdsked.
I have mine slightly wrong and they get chkdsked every boot, it is so
quick that I don't worry about fixing it.


As far as I know you have to reformat the partition. It is good to move
everything now and again with xcopy to clear up defragmentation anyways.
(while HPFS and JFS resist fragmentation they do fragment over time)


After the HPFS statement so the boot drive starts working first.


Dave

+ User FidoNet address: 1:396/45
Hello all.

<On 23Aug2008 12:14 Alex Taylor wrote a message to All regarding
Re: HPFS plus JFS >

> > 6. Where does if IFS statement go in the config.sys?
> > Before or after the HPFS statement?

> After the HPFS statement so the boot drive starts working
> first.

AT> That is not correct. The JFS statement should go _before_
AT> the HPFS statement, otherwise the IBM locked file device
AT> driver (if ever used) tends to blow up.

Thank you, Alex. Your insight is valuable as the suggested
"HPFS first" order would normally seem logical... Until such
time as a fixpak or something that uses that locked file driver
comes along.

Be well.

Best regards,
Marc
-+-timEd/2 1.10.y2k+
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ The FidoNet News Gate (Meridian, MS - USA) +
+ The views of this user are strictly his or her own. +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++

That is not correct. The JFS statement should go _before_ the HPFS
statement, otherwise the IBM locked file device driver (if ever used)
tends to blow up.


--
Alex Taylor
Fukushima, Japan
http://www.yqcomputer.com/ ~ataylo00

Please take off hat when replying.

Interesting, I thought the advice for the locked device driver was to
always have HPFS at the top of config.sys. Of course that advice comes
from before JFS was released.
Dave