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ozbird Apprentice
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Joined: 21 Oct 2003 Posts: 185
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Posted: Wed Feb 08, 2006 9:21 am Post subject: Mounting EFS (Irix) partitions from Gentoo MIPS LiveCD? |
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A friend of mine has bought an old SGI Indy box, with Irix installed on the hard disk.
I suggested that they get the experimental MIPS LiveCD so they can poke around without breaking anything.
While it appears to boot correctly, but they can only mount the disk partitions read-only. (They tried using "-o rw", but no luck.)
Is there a trick to getting EFS partitions mounted read-write? |
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Redhatter Retired Dev
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Joined: 20 Sep 2003 Posts: 548 Location: Brisbane, QLD, Australia
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Posted: Thu Feb 09, 2006 2:41 am Post subject: |
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Linux doesn't support writing to EFS partitions. Hence -o rw doesn't work. _________________ Stuart Longland (a.k.a Redhatter, VK4MSL)
I haven't lost my mind - it's backed up on a tape somewhere...
Gentoo/MIPS Cobalt developer, Mozilla herd member. |
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ozbird Apprentice
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Joined: 21 Oct 2003 Posts: 185
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Posted: Fri Feb 10, 2006 8:20 am Post subject: |
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Redhatter wrote: | Linux doesn't support writing to EFS partitions. Hence -o rw doesn't work. |
I had a feeling that might be the case. Luckily, read-write access wasn't required to liberate the box. |
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Kumba Developer
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Joined: 16 Jul 2002 Posts: 393 Location: Sigma 957
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Posted: Mon Feb 13, 2006 6:48 pm Post subject: |
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The Gentoo/MIPS SGI LiveCD doesn't use EFS partitions -- it's similar in design to what an IRIX install CD might be (with disk partitions and all), but it has an ext2 partition on it instead. That's where the CD loads everything from. IRIX only uses EFS on its own install CD sets. The filesystem used in an IRIX install is XFS - and Linux should have read/write support for that. The thing that I know of is that if the IRIX filesystem was uncleanly mounted (Due to a power failure or whatnot), you won't be able to do much with it under Linux because Linux's XFS implementation apparently can't deal with unclean XFS partitions. This may manifest itself in strange ways, like the partition being read-only, or just not mounting at all.
--Kumba _________________ "The past tempts us, the present confuses us, the future frightens us. And our lives slip away, moment by moment, lost in that vast, terrible in-between."
--Emperor Turhan, Centauri Republic |
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Blood Fluke Apprentice
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Joined: 15 Sep 2005 Posts: 224
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Posted: Thu Feb 16, 2006 2:29 pm Post subject: |
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ozbird wrote: | Redhatter wrote: | Linux doesn't support writing to EFS partitions. Hence -o rw doesn't work. |
I had a feeling that might be the case. Luckily, read-write access wasn't required to liberate the box. |
For future reference, anything old enough to be using an EFS root will never require read-write access to change the password. IRIX 5.x and earlier used UNIX crypt as their password hash. It's so weak that a modern computer can brute force it with John the Ripper in a matter of minutes. |
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