Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site cygnet.UUCP Path: utzoo!watmath!clyde!burl!mgnetp!ihnp4!houxm!houxz!vax135!cornell!uw-beaver!tektronix!hplabs!cygnet!karl From: karl@cygnet.UUCP (Karl Danz) Newsgroups: net.bugs.4bsd Subject: Bug in bad sector remapping. Message-ID: <491@cygnet.UUCP> Date: Fri, 8-Jun-84 19:17:07 EDT Article-I.D.: cygnet.491 Posted: Fri Jun 8 19:17:07 1984 Date-Received: Sun, 10-Jun-84 01:24:39 EDT Organization: Cygnet Systems -- Sunnyvale, CA Lines: 37 Subject: Problem with adding entries to bad sector list. Index: /sys/vax/dkbad.c 4.2BSD Fix ------------------------------------------------------------------------ Description: For some disks, the bad144(8) utility can be used to add entries to the bad sector list after a disk has been in use for a while. These new entries must be placed at the end of the list since the remapping to new sectors is based only on relative position of entries in the list. The remapping routine, isbad(), assumes an ordered list (apparently in the interest of efficiency) and can exit before noticing new entries. Repeat-By: Add a new entry to the bad sector list with bad144, specifying the "-f" flag (only allowed on RP06's, eagles, and capricorns). The new sector number must be smaller than the largest number currently in the list for the bug to manifest itself. Somehow force I/O to the bad sector (e.g. copy a big file several times). A hard BSE (bad sector error) will be reported and no remapping will occur. Fix: One line change to /sys/vax/dkbad.c follows. Note that this is really not going to slow things down very much as isbad() will still bail out at the end of the active list (entries after that are set to -1). Besides, BSE's typically occur infrequently. ---------------------------------------------------------------- RCS file: dkbad.c,v retrieving revision 1.1 diff -r1.1 dkbad.c 25c25 < if (blk < bblk || bblk < 0) --- > if (bblk < 0) ------------------------------------------------------------------------ Karl Danz Cygnet Systems