* Very high load when reading/writing
@ 2014-05-01 17:50 Hendrik Friedel
2014-05-05 16:16 ` David Sterba
2014-05-05 23:37 ` Chris Murphy
0 siblings, 2 replies; 3+ messages in thread
From: Hendrik Friedel @ 2014-05-01 17:50 UTC (permalink / raw)
To: linux-btrfs
Dear all,
I have very high load when writing/reading from/to two of my btrfs
volumes. One sda1, mounted as /mnt/BTRFS, the other, sdd2/sde2 (raid) as /
sda1 is a 3TB disc, whereas the sdd2/sde2 are small SSDs of 16GB.
I wrote a small script to demonstrate it. It does:
-echo what it will do
-show the current load
-dd from one volume to the other.
-show the current load
-sync and flush the cache
-sleep 300s in order to get the load down again.
Here the output:
Test from /mnt/BTRFS to /tmp
1.05 0.55, 0.41
124,553 s, 16,8 MB/s
6.98 2.94, 1.30
Test /mnt/BTRFS to /mnt/BTRFS
0.23 1.32, 1.10
127,008 s, 16,5 MB/s
4.76 2.82, 1.69
Test /mnt/BTRFS to /dev/null
0.17 1.29, 1.39
21,9972 s, 95,3 MB/s
0.64 1.31, 1.39
Test from /tmp to /mnt/BTRFS
0.23 0.64, 1.08
124,655 s, 16,8 MB/s
8.63 3.44, 2.03
I'm sure, this is not normal, is it?
What I mean:
The load is very high and the data rate is very low.
Below some Information on the Filesystems and Disks.
I'd appreciate any help to understand what's wrong.
Regards,
Hendrik
# ~/btrfs/integration/devel/btrfs fi show /mnt/BTRFS/Video/
Label: 'Daten' uuid: d3ba0e97-24ae-4f94-b407-05bf2cd4ddf4
Total devices 1 FS bytes used 2.31TiB
devid 1 size 2.73TiB used 2.35TiB path /dev/sda1
Btrfs this-will-become-v3.13-48-g57c3600
# ~/btrfs/integration/devel/btrfs fi show /
Label: 'ROOT_BTRFS_RAID' uuid: a2d5f2db-04ca-413a-aee1-cb754aa8fba5
Total devices 2 FS bytes used 7.50GiB
devid 1 size 14.85GiB used 14.36GiB path /dev/sde2
devid 2 size 14.65GiB used 14.36GiB path /dev/sdd2
uname -r
3.14.0-031400rc4-generic
./btrfsck /dev/sda1
Checking filesystem on /dev/sda1
UUID: d3ba0e97-24ae-4f94-b407-05bf2cd4ddf4
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 1264928671538 bytes used err is 0
total csum bytes: 2475071700
total tree bytes: 2829418496
total fs tree bytes: 55672832
total extent tree bytes: 72744960
btree space waste bytes: 210148896
file data blocks allocated: 2535102173184
referenced 2533075963904
Btrfs this-will-become-v3.13-48-g57c3600
Checking filesystem on /dev/sdd2
UUID: a2d5f2db-04ca-413a-aee1-cb754aa8fba5
checking extents
checking free space cache
checking fs roots
checking csums
checking root refs
found 423637793 bytes used err is 0
total csum bytes: 8078432
total tree bytes: 421920768
total fs tree bytes: 393560064
total extent tree bytes: 18857984
btree space waste bytes: 71825111
file data blocks allocated: 16775815168
referenced 8751009792
Btrfs this-will-become-v3.13-48-g57c3600
smartctl -a /dev/sdd2
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.14.0-031400rc4-generic]
(local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Device Model: MXSSD2MSLD16G-V
Serial Number: 0YWOMT24NF16IB8U
Firmware Version: 20130221
User Capacity: 15.837.691.904 bytes [15,8 GB]
Sector Size: 512 bytes logical/physical
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Thu May 1 19:48:58 2014 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection:
Disabled.
Total time to complete Offline
data collection: ( 0) seconds.
Offline data collection
capabilities: (0x00) Offline data collection
not supported.
SMART capabilities: (0x0002) Does not save SMART data before
entering power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x00) Error logging NOT supported.
No General Purpose Logging support.
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x0000 100 100 050 Old_age
Offline - 0
5 Reallocated_Sector_Ct 0x0002 100 100 050 Old_age
Always - 0
9 Power_On_Hours 0x0000 100 100 050 Old_age
Offline - 4690
12 Power_Cycle_Count 0x0000 100 100 050 Old_age
Offline - 15
160 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 0
161 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 136
162 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 121
163 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 4
164 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 847849
165 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 445
166 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 381
167 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 416
168 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 100000
169 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 100
192 Power-Off_Retract_Count 0x0000 100 100 050 Old_age
Offline - 0
194 Temperature_Celsius 0x0000 100 100 050 Old_age
Offline - 55
195 Hardware_ECC_Recovered 0x0000 100 100 050 Old_age
Offline - 0
196 Reallocated_Event_Count 0x0000 100 100 050 Old_age
Offline - 0
198 Offline_Uncorrectable 0x0000 100 100 050 Old_age
Offline - 0
199 UDMA_CRC_Error_Count 0x0000 100 100 050 Old_age
Offline - 0
241 Total_LBAs_Written 0x0032 100 100 050 Old_age Always
- 62687
242 Total_LBAs_Read 0x0032 100 100 050 Old_age Always
- 7975
SMART Error Log not supported
Error SMART Error Self-Test Log Read failed: scsi error aborted command
Smartctl: SMART Self Test Log Read Failed
Device does not support Selective Self Tests/Logging
smartctl -a /dev/sde2
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.14.0-031400rc4-generic]
(local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Device Model: MXSSD2MMSLF-16G
Serial Number: AA00000000000108304
Firmware Version: M0424E
User Capacity: 16.047.407.104 bytes [16,0 GB]
Sector Size: 512 bytes logical/physical
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Thu May 1 19:47:45 2014 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection:
Disabled.
Total time to complete Offline
data collection: ( 0) seconds.
Offline data collection
capabilities: (0x00) Offline data collection
not supported.
SMART capabilities: (0x0002) Does not save SMART data before
entering power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x00) Error logging NOT supported.
No General Purpose Logging support.
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x0000 100 100 050 Old_age
Offline - 0
5 Reallocated_Sector_Ct 0x0002 100 100 050 Old_age
Always - 0
12 Power_Cycle_Count 0x0000 100 100 050 Old_age
Offline - 12
160 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 0
161 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 114
162 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 100
163 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 1
164 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 700678
165 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 373
166 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 308
167 Unknown_Attribute 0x0000 100 100 050 Old_age
Offline - 343
192 Power-Off_Retract_Count 0x0000 100 100 050 Old_age
Offline - 0
194 Temperature_Celsius 0x0000 100 100 050 Old_age
Offline - 25
195 Hardware_ECC_Recovered 0x0000 100 100 050 Old_age
Offline - 0
196 Reallocated_Event_Count 0x0000 100 100 050 Old_age
Offline - 0
198 Offline_Uncorrectable 0x0000 000 000 000 Old_age
Offline - 0
199 UDMA_CRC_Error_Count 0x0000 100 100 050 Old_age
Offline - 0
241 Total_LBAs_Written 0x0032 100 100 050 Old_age Always
- 68531
242 Total_LBAs_Read 0x0032 100 100 050 Old_age Always
- 11949
SMART Error Log not supported
Error SMART Error Self-Test Log Read failed: scsi error aborted command
Smartctl: SMART Self Test Log Read Failed
Device does not support Selective Self Tests/Logging
root@homeserver:/mnt/BTRFS/Video# smartctl -a /dev/sda1
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.14.0-031400rc4-generic]
(local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: Seagate Barracuda 7200.14 (AF)
Device Model: ST3000DM001-9YN166
Serial Number: Z1F0HLRF
LU WWN Device Id: 5 000c50 03fe071a4
Firmware Version: CC4B
User Capacity: 3.000.592.982.016 bytes [3,00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 4
Local Time is: Thu May 1 19:48:16 2014 CEST
==> WARNING: A firmware update for this drive may be available,
see the following Seagate web pages:
http://knowledge.seagate.com/articles/en_US/FAQ/207931en
http://knowledge.seagate.com/articles/en_US/FAQ/223651en
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection:
Disabled.
Self-test execution status: ( 39) The self-test routine was
interrupted
by the host with a hard or soft
reset.
Total time to complete Offline
data collection: ( 575) seconds.
Offline data collection
capabilities: (0x73) SMART execute Offline immediate.
Auto Offline data collection
on/off support.
Suspend Offline collection upon new
command.
No Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 255) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x3085) SCT Status supported.
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 111 099 006 Pre-fail
Always - 41785552
3 Spin_Up_Time 0x0003 092 092 000 Pre-fail
Always - 0
4 Start_Stop_Count 0x0032 092 092 020 Old_age
Always - 9214
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail
Always - 0
7 Seek_Error_Rate 0x000f 073 054 030 Pre-fail
Always - 34538763506
9 Power_On_Hours 0x0032 065 065 000 Old_age
Always - 31127
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail
Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age
Always - 195
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always
- 0
184 End-to-End_Error 0x0032 100 100 099 Old_age Always
- 0
187 Reported_Uncorrect 0x0032 096 096 000 Old_age Always
- 4
188 Command_Timeout 0x0032 100 099 000 Old_age Always
- 4 4 4
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always
- 0
190 Airflow_Temperature_Cel 0x0022 070 050 045 Old_age Always
- 30 (0 11 46 24)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always
- 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always
- 168
193 Load_Cycle_Count 0x0032 091 091 000 Old_age Always
- 18955
194 Temperature_Celsius 0x0022 030 050 000 Old_age Always
- 30 (Min/Max 0/32768)
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always
- 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age
Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always
- 0
240 Head_Flying_Hours 0x0000 100 253 000 Old_age
Offline - 12713h+28m+42.648s
241 Total_LBAs_Written 0x0000 100 253 000 Old_age
Offline - 198677093686033
242 Total_LBAs_Read 0x0000 100 253 000 Old_age
Offline - 255171735004347
SMART Error Log Version: 1
ATA Error Count: 4
CR = Command Register [HEX]
FR = Features Register [HEX]
SC = Sector Count Register [HEX]
SN = Sector Number Register [HEX]
CL = Cylinder Low Register [HEX]
CH = Cylinder High Register [HEX]
DH = Device/Head Register [HEX]
DC = Device Command Register [HEX]
ER = Error register [HEX]
ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.
Error 4 occurred at disk power-on lifetime: 29355 hours (1223 days + 3
hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 08 ff ff ff 4f 00 20d+22:23:53.940 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 20d+22:23:53.940 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 20d+22:23:53.939 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 20d+22:23:53.939 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 20d+22:23:53.923 READ FPDMA QUEUED
Error 3 occurred at disk power-on lifetime: 29355 hours (1223 days + 3
hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 80 ff ff ff 4f 00 20d+22:23:50.852 READ FPDMA QUEUED
60 00 00 ff ff ff 4f 00 20d+22:23:50.852 READ FPDMA QUEUED
60 00 00 ff ff ff 4f 00 20d+22:23:50.851 READ FPDMA QUEUED
60 00 08 d0 ac 14 40 00 20d+22:23:50.834 READ FPDMA QUEUED
60 00 b0 ff ff ff 4f 00 20d+22:23:50.823 READ FPDMA QUEUED
Error 2 occurred at disk power-on lifetime: 29328 hours (1222 days + 0
hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 08 ff ff ff 4f 00 19d+19:57:48.409 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 19d+19:57:48.409 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 19d+19:57:48.409 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 19d+19:57:48.409 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 19d+19:57:48.392 READ FPDMA QUEUED
Error 1 occurred at disk power-on lifetime: 29328 hours (1222 days + 0
hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
60 00 80 ff ff ff 4f 00 19d+19:57:45.214 READ FPDMA QUEUED
60 00 00 ff ff ff 4f 00 19d+19:57:45.214 READ FPDMA QUEUED
60 00 00 ff ff ff 4f 00 19d+19:57:45.213 READ FPDMA QUEUED
60 00 08 ff ff ff 4f 00 19d+19:57:45.198 READ FPDMA QUEUED
60 00 80 ff ff ff 4f 00 19d+19:57:45.190 READ FPDMA QUEUED
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Extended offline Interrupted (host reset) 70% 31123
-
# 2 Short offline Completed without error 00% 31110
-
# 3 Short offline Completed without error 00% 31085
-
# 4 Short offline Completed without error 00% 31061
-
# 5 Short offline Completed without error 00% 31037
-
# 6 Short offline Completed without error 00% 31013
-
# 7 Extended offline Completed without error 00% 30995
-
# 8 Short offline Completed without error 00% 30989
-
# 9 Short offline Completed without error 00% 30965
-
#10 Short offline Completed without error 00% 30941
-
#11 Short offline Completed without error 00% 30917
-
#12 Short offline Completed without error 00% 30893
-
#13 Short offline Completed without error 00% 30869
-
#14 Short offline Completed without error 00% 30845
-
#15 Extended offline Completed without error 00% 30827
-
#16 Short offline Completed without error 00% 30821
-
#17 Short offline Completed without error 00% 30797
-
#18 Short offline Completed without error 00% 30773
-
#19 Short offline Completed without error 00% 30749
-
#20 Short offline Completed without error 00% 30725
-
#21 Short offline Completed without error 00% 30701
-
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
---
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Very high load when reading/writing
2014-05-01 17:50 Very high load when reading/writing Hendrik Friedel
@ 2014-05-05 16:16 ` David Sterba
2014-05-05 23:37 ` Chris Murphy
1 sibling, 0 replies; 3+ messages in thread
From: David Sterba @ 2014-05-05 16:16 UTC (permalink / raw)
To: Hendrik Friedel; +Cc: linux-btrfs
On Thu, May 01, 2014 at 07:50:11PM +0200, Hendrik Friedel wrote:
> I have very high load when writing/reading from/to two of my btrfs volumes.
> One sda1, mounted as /mnt/BTRFS, the other, sdd2/sde2 (raid) as /
> sda1 is a 3TB disc, whereas the sdd2/sde2 are small SSDs of 16GB.
>
> I wrote a small script to demonstrate it. It does:
> -echo what it will do
> -show the current load
> -dd from one volume to the other.
> -show the current load
> -sync and flush the cache
> -sleep 300s in order to get the load down again.
load average is not a good metric, it mixes IO an CPU load into one
number, would be better to measure cpu and IO loads separately.
> Here the output:
> Test from /mnt/BTRFS to /tmp
> 124,553 s, 16,8 MB/s
Is the transfer speed comparable if using a bare blockdevice instead of
a filesystem on top of that?
According to the S.M.A.R.T. stats the devices seem to be working
normally.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Very high load when reading/writing
2014-05-01 17:50 Very high load when reading/writing Hendrik Friedel
2014-05-05 16:16 ` David Sterba
@ 2014-05-05 23:37 ` Chris Murphy
1 sibling, 0 replies; 3+ messages in thread
From: Chris Murphy @ 2014-05-05 23:37 UTC (permalink / raw)
To: Hendrik Friedel; +Cc: linux-btrfs
On May 1, 2014, at 11:50 AM, Hendrik Friedel <hendrik@friedels.name> wrote:
>
> Here the output:
> Test from /mnt/BTRFS to /tmp
I'm not sure what this is testing, what the file size is or how many files. These days it's increasingly common to see tmpfs mount on /tmp rather than persistent storage; and then at some threshold it uses swap. So I'm unsure this is a reliable testing source or destination.
What results do you get for the same test using /dev/zero to /tmp and /tmp to /dev/null?
trimmed:
> root@homeserver:/mnt/BTRFS/Video# smartctl -a /dev/sda1
> === START OF INFORMATION SECTION ===
> Model Family: Seagate Barracuda 7200.14 (AF)
> Device Model: ST3000DM001-9YN166
>
> SMART Attributes Data Structure revision number: 10
> Vendor Specific SMART Attributes with Thresholds:
> ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
> 7 Seek_Error_Rate 0x000f 073 054 030 Pre-fail Always - 34538763506
The raw value is typical for Seagate drives, but the value and worst compared to threshold would concern me. The value should be at 100, ideally, for a completely normally functioning drive. It's OK if it dips below this and there are no other problems. But worst value 54 is pretty close to threshold 30, it's just not low enough to trigger a prefail warning. It's worth sending the data to Seagate and seeing what they have to say about it if it's still in warranty.
Chris Murphy
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-05-05 16:16 ` David Sterba
2014-05-05 23:37 ` Chris Murphy
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