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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