2 hardisks with same size shows big difference in LifeTime during smartctl self test
Hi,
I have 2 HDDS on RAID1
srv1:~# dmesg |grep sda
[ 2.291895] sd 0:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
[ 2.291895] sd 0:0:0:0: [sda] Write Protect is off
[ 2.291895] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 2.291895] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 2.291895] sd 0:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
[ 2.291895] sd 0:0:0:0: [sda] Write Protect is off
[ 2.291895] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 2.291895] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 2.291895] sda: sda1 sda2 sda3 sda4
[ 2.309892] sd 0:0:0:0: [sda] Attached SCSI disk
[ 2.572419] md: bind<sda1>
[ 2.646614] md: bind<sda2>
[ 2.668049] md: bind<sda3>
[ 2.689747] md: bind<sda4>
srv1:~# dmesg |grep sdb
[ 2.309971] sd 1:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
[ 2.310023] sd 1:0:0:0: [sdb] Write Protect is off
[ 2.310062] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2.310079] sd 1:0:0:0: [sdb] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 2.310167] sd 1:0:0:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
[ 2.310219] sd 1:0:0:0: [sdb] Write Protect is off
[ 2.310257] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2.310275] sd 1:0:0:0: [sdb] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 2.310334] sdb: sdb1 sdb2 sdb3 sdb4
[ 2.334975] sd 1:0:0:0: [sdb] Attached SCSI disk
[ 2.574688] md: bind<sdb1>
[ 2.649835] md: bind<sdb2>
[ 2.668049] md: bind<sdb3>
[ 2.689747] md: bind<sdb4>
srv1:~#
I ran
smartctl -t long on both the hard disks.
now when I take the log
srv1:~# smartctl -l selftest /dev/sda
smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8
Bruce Allen
Home page is http://smartmontools.sourceforge.net/
=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Extended offline Self-test routine in progress 90% 576 -
srv1:~# smartctl -l selftest /dev/sdb
smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8
Bruce Allen
Home page is http://smartmontools.sourceforge.net/
=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Extended offline Self-test routine in progress 90% 60 -
srv1:~#
why is the life time of sda around *10* times that of sdb ?
thanks
--Siju
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