Date: Wed, 31 Mar 1999 09:10:26 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Darren Reed <avalon@coombs.anu.edu.au> Cc: mladavac@metropolitan.at (Ladavac Marino), rb@gid.co.uk, avalon@coombs.anu.edu.au, wilko@yedi.iaf.nl, jkh@zippy.cdrom.com, hackers@FreeBSD.ORG Subject: Re: another ufs panic.. Message-ID: <199903311710.JAA49644@apollo.backplane.com> References: <199903311133.VAA10193@cheops.anu.edu.au>
next in thread | previous in thread | raw e-mail | index | archive | help
:Well....
:first run, no tar on EIDE drive (just two drives now, EIDE & SCSI,
:nothing else powered, which has ended up with corrupt dirs):
:
:gawaine /usr# dd if=/dev/zero bs=16384k of=/dev/rsd0s4
:dd: /dev/rsd0s4: short write on character device
:dd: /dev/rsd0s4: end of device
:125+0 records in
:124+1 records out
:2089221120 bytes transferred in 248.516462 secs (8406772 bytes/sec)
:
:Now the interesting part!
:
:I wrote my own program to read it back and check that all that was read
:was indeed null bytes...however!
:
:>From 874627584 (0x3421c200 - 0x3421cfff) was non-null (actually garbage,
:not just 0x01 or 0x02 or 0xf0, etc). About 3572 bytes worth.
:
:Wanting to confirm the location, I ran it again...this time 95573 bytes.
What release of the os ?
:To check disk contents I adapted the program I used to read back to seek
:to the above position. No problem. A run after that again, 85212 and
:33157.
:..
:Try again with 2.2.8-STABLE (built from GENERIC):
:
:# dd if=/dev/zero bs=16384k of=/dev/rsd0s4
:dd: /dev/rsd0s4: short write on character device
:dd: /dev/rsd0s4: end of device
:125+0 records in
:124+1 records out
:2089221120 bytes transferred in 244.473397 secs (8545801 bytes/sec)
:
:No non-zero bytes were read back using the program I wrote.
:
:Darren
-Matt
Matthew Dillon
<dillon@backplane.com>
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199903311710.JAA49644>