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- From: markd@cup.hp.com (Mark_Donohoe)
- Newsgroups: comp.sys.hp
- Subject: Re: Disk Array & 2GB HP-UX limit
- Message-ID: <BuLDpr.BDK@cup.hp.com>
- Date: 14 Sep 92 23:39:27 GMT
- References: <1992Sep12.005322.3016@polari>
- Sender: news@cupnews0.cup.hp.com
- Organization: Hewlett-Packard
- Lines: 38
- X-Newsreader: Tin 1.1.3 PL5
-
- lampi@polari.online.com wrote:
- : In article <BuBwMI.MFC@cup.hp.com> markd@cup.hp.com (Mark_Donohoe) writes:
- : >Raj PUBALA (klitd@hpsgm2.sgp.hp.com) wrote:
- : >: Looking at the HP Disk Arrays data sheet, I see that with four disk drives
- : >: in the array, we offer 5.4 GB of storage.
- : >:
- : >: I also read about the LVM (Logical Volume Manager) in HP-UX 9.0, which
- : >: says the size of a LV is still limited to 2GB which is the HP-UX
- : >: system limitation.
- : >:
- : >
- : >Yes, I have configured the LVM to be a 3.9Gig file system on HP-UX
- : >9.0. BTW, 4gig is the bigest that HP-UX can support at this time,
- : >(you actually end up with a little less than 4 gig because of LVM and
- : >other over head.) It will take 64 bit pointers to address more in the
- : >file system.
- : >
- : Why would it take 64 bit pointers to address >4GB file systems? After all,
- : we're not necessarily talking about >4GB *files* (which would require
- : such pointers), we're talking about >4GB *volumes*. It's really a stupid
- : limitation that should have nothing to do with the 32 bit limit of
- : pointers. After all, we're not talking about a pointer based from the
- : beginning of the logical volume when we address the contents of a given file.
- :
- : Or are we? :-)
- :
- I don't think it is reasonable to limit files as such. If you need >4Gig
- then you MIGHT just have a file bigger than 2gig, in which case you need the
- larger pointer. Secondly, as hinted at, it is IMHO better to have a general
- solution that does not restrict things. What you suggest is that you could
- support a file system greater than 4gig, but no file could be bigger than
- 2gig....not very general if you ask me. Especially since memory will be
- greater than 2gig very soon (think of a >2gig OS core dump to wade through!).
-
- anywho, that is what is supported now and possible. Thought the original
- poster might want to know.
- --
- Mark Donohoe (markd@cup.hp.com)
-