I have a NetBSD 2.0.2, i386, with an uptime of 238 days. The install
is about a year and a half old, running 24/7 since May 2005.

It has three WDs, and wd1/wd2 are a mirror. Nothing has changed
physically in the system, so the usual 'cable problem' suggestion 
doesn't seem to apply.

These started in September, and have become common:

Sep 19 08:58:28 mail /netbsd: wd0a: error writing fsbn 1114304 of 1114304-1114319 (wd0 bn 1114367; cn 1105 tn 8 sn 23), retrying
Sep 19 08:58:29 mail /netbsd: wd0: (aborted command, interface CRC error)
Sep 19 08:58:29 mail /netbsd: wd0: soft error (corrected)

They show up on wd0 and wd1, which share a controller, and a cable. 
All errors are corrected so far. (18 on wd0, 19 on wd1) 

All of the errors occur while writing, and there's no locality 
amongst the sectors invovled in the errored writes.

The smart status shows a high count on wd0 for raw read error rate and
hardware ECC recovered errors, so I'm inclined to replace that drive.

There's also no obvious pattern to the frequency.

Comments welcome, in case there's something else I've forgetten to
consider.. Thanks.

Sep 19 08:58:29 mail /netbsd: wd0: (aborted command, interface CRC error)
Sep 20 20:07:08 mail /netbsd: wd1: (aborted command, interface CRC error)
Sep 22 10:03:57 mail /netbsd: wd0: (aborted command, interface CRC error)
Sep 25 15:57:21 mail /netbsd: wd1: (aborted command, interface CRC error)
Sep 27 13:03:27 mail /netbsd: wd1: (aborted command, interface CRC error)
Sep 30 03:16:07 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct  3 04:02:46 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct  3 11:18:42 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct  5 02:25:58 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct  5 12:49:38 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct  6 07:19:08 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct  6 07:52:20 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct  7 03:58:23 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct  7 04:30:05 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct  7 08:14:08 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct  7 19:30:41 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct  7 23:45:10 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 10 02:20:02 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 12 00:25:14 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 12 00:35:35 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 12 22:45:23 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 13 00:53:35 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 13 02:45:54 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 13 10:10:00 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 13 21:03:06 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 13 23:17:26 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 14 01:37:59 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 14 04:33:07 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 14 07:55:02 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 14 12:12:11 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 15 12:32:50 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 16 07:37:27 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 17 11:59:01 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 17 17:51:38 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 17 21:03:26 mail /netbsd: wd0: (aborted command, interface CRC error)
Oct 19 20:29:45 mail /netbsd: wd1: (aborted command, interface CRC error)
Oct 20 07:00:37 mail /netbsd: wd0: (aborted command, interface CRC error)

-- 
David Maxwell, david@vex.net|david@maxwell.net -->
An organization gets what it rewards.
			      - Perry Metzger