kern/143126: [ata] Data loss on read timeout
ruan at mail.univ.kiev.ua
Sat Jan 23 14:50:01 UTC 2010
>Synopsis: [ata] Data loss on read timeout
>Arrival-Date: Sat Jan 23 14:50:01 UTC 2010
>Originator: Andrey Russev
FreeBSD mizar 8.0-RELEASE FreeBSD 8.0-RELEASE #1: Sun Nov 29 02:44:55 EET 2009 root at mizar:/usr/src/sys/i386/compile/MIZAR i386
Sometimes (possibly on heavy loads of disk) kernel prints messages like:
ad6: TIMEOUT - READ_DMA48 retrying (1 retry left) LBA=615699968
These messages appear while copy/move of large file in progress. Such timeouts do not interrupt commands and they finish _without_ errors.
In case mentioned above I figured out that data from previous 64k block (LBA=615699968-128) was damaged (first ~30% bytes are correct). Second copy command (after unmount/mount) makes exact copy of data.
I don't know. It occurs at random intervals.
More information about the freebsd-bugs