Re: disk testing
From: Sebastien Koechlin <hidden>
Date: 2004-09-17 15:08:08
On Thu, Sep 16, 2004 at 10:50:05PM -0400, harry wrote:
Tim and Neil have suggested (apparently correctly) that the disk had a bad sector and the firmware remapped it when I wrote to it. My question is, how many spare sectors does the typical disk have? More importantly, since the sector has been remapped, recreating the raid5 array worked fine, but is a failure right out of the box normal? I was going to return it but since its working now I'm not sure if I should or not.
Can you read SMART Attributes under any OS? Every disk I use, have a SMART Reallocated_Sector_Ct Attribute: ------ # smartctl -A /dev/hde smartctl version 5.32 Copyright (C) 2002-4 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 065 063 006 Pre-fail Always 147852401 3 Spin_Up_Time 0x0003 100 100 000 Pre-fail Always 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always 0 5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always 0 (...) ------ You should search for your hard-drive datasheet, but RAW_VALUE is probably a counter of remapped sectors. If RAW_VALUE is high, if VALUE is low and going near THRESH, it means you're going to have troubles with this disk. You can read http://www.linuxjournal.com/article.php?sid=6983 -- Seb, autocuiseur