Date: Sun, 6 Apr 1997 11:58:04 +0200 (MET DST) From: Wolfgang Helbig <helbig@MX.BA-Stuttgart.De> To: kkenn@bns.com.au (Kris Kennaway) Cc: questions@freebsd.org Subject: Re: Corrupted swapspace Message-ID: <199704060958.LAA00798@helbig.informatik.ba-stuttgart.de> In-Reply-To: <199704060322.MAA22496@topdown.bns.com.au> from Kris Kennaway at "Apr 6, 97 12:52:57 pm"
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Hi,
> I've just been playing around with my hard disk partitions (resized the
> primary DOS partition on my first hard drive using partition magic and
> changed the cluster size), which is the only thing I can think of that
> was actually changed in the meantime. I added another FreeBSD partition
> on a second drive and moved around some directories, but I can't think
> how that could have caused the problem below:
>
> The FreeBSD swap space on my first hard drive seems to be corrupt: this
> is what disklabel -r /wd0s2a makes of it:
>
> [morden] 11:55 ~ disklabel -r /dev/wd0s2a
> # /dev/wd0s2a:
> type: ESDI
> disk: wd0s2
> label:
> flags:
> bytes/sector: 512
> sectors/track: 63
> tracks/cylinder: 64
> sectors/cylinder: 4032
> cylinders: 354
> sectors/unit: 1427328
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0 # milliseconds
> track-to-track seek: 0 # milliseconds
> drivedata: 0
>
> 8 partitions:
> # size offset fstype [fsize bsize bps/cpg]
> a: 65536 0 4.2BSD 0 0 0 # (Cyl. 0 - 16*)
> b: 88256 65536 swap # (Cyl. 16*- 38*)
> c: 1427328 0 unused 0 0 # (Cyl. 0 - 353)
> e: 61440 153792 4.2BSD 0 0 0 # (Cyl. 38*- 53*)
> f: 1212096 215232 4.2BSD 0 0 0 # (Cyl. 53*- 353*)
>
> [morden] 11:57 ~ disklabel -r /dev/wd0s2b
^ rwd0s2b
> Bad pack magic number (label is damaged, or pack is unlabeled)
That is ok, the swap partition does not have a disklabel, only the slice
has, e. g.
disklabel -r /dev/rwd0s2
is the disklabel for the second slice.
BTW use raw devices as argument for disklabel(8). I know, disklabel(8) tries
to be smart and will automagically include the "r", but this "feature"
breaks my golden rule:
Use a raw device argument for fstab(8), disklabel(8), newfs(8).
Use the block device for mount(8).
>
> By contrast, disklabel -r on my other swap partition on the second hard
> drive correctly gives me the disklabel summary for the drive.
>
That is strange! I think your second drive is not o. k.
> By rights, I should have 88M total swap with these two partitions, but
^^^
You have already 88M on your first swap partition, so the total should
be greater.
> top was reporting it as 133M total. Presumably as a consequence, my
> processes kept on dying with signal 10 and 11 (I'm assuming this is what
> hapened when they tried to enter the phantom swap-space). I've removed
> the first swapon entry from fstab and it seems to be working fine so far.
>
Use pstat -s to see what the systems thinks it should use as swap space
and compare to what you think it should use.
Good luck
Wolfgang
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