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Hi.
I read some posts about readynas Performance because my NAS is performing badly.
It seems that the performance gets worse if I try to make bigger copies (~180MB). But under this threshold, the values are OK.
I have a ReadyNAS NV+ v2 with 2 physical disks on a X-RAID2 configuration.
How can I debug the readynas performance?
Tests:
root@nas:/c/home# dd if=/dev/zero of=/c/testfile bs=100M count=1 oflag=direct1+0 records in1+0 records out104857600 bytes (105 MB) copied, 3.02856 s, 34.6 MB/sroot@nas:/c/home# dd if=/dev/zero of=/c/testfile bs=300M count=1 oflag=direct1+0 records in1+0 records out314572800 bytes (315 MB) copied, 121.47 s, 2.6 MB/sroot@nas:/c/home# dd if=/dev/zero of=/c/testfile bs=200M count=1 oflag=direct1+0 records in1+0 records out209715200 bytes (210 MB) copied, 21.0231 s, 10.0 MB/sroot@nas:/c/home# dd if=/dev/zero of=/c/testfile bs=150M count=1 oflag=direct1+0 records in1+0 records out157286400 bytes (157 MB) copied, 2.83984 s, 55.4 MB/sroot@nas:/c/home# dd if=/dev/zero of=/c/testfile bs=180M count=1 oflag=direct1+0 records in1+0 records out188743680 bytes (189 MB) copied, 12.5438 s, 15.0 MB/sroot@nas:/c/home# dd if=/dev/zero of=/c/testfile bs=160M count=1 oflag=direct1+0 records in1+0 records out167772160 bytes (168 MB) copied, 5.64689 s, 29.7 MB/s
Thanks
Your NAS has 256MB RAM so you're pushing past the limits of what can be cached in memory.
Which brand and model disks are you using?Have you checked your disks SMART stats to see if there are errors?
I am using X-RAID2 with only 2 disks so I believe that it's like a RAID1.
Disk 1:
=== START OF INFORMATION SECTION ===Model Family: SAMSUNG SpinPoint F1 DTDevice Model: SAMSUNG HD753LJ
Disk 2:
=== START OF INFORMATION SECTION ===Model Family: Western Digital Caviar Green (Adv. Format)Device Model: WDC WD20EARX-00PASB0
SMART Info - Disk 1:
SMART Attributes Data Structure revision number: 16Vendor Specific SMART Attributes with Thresholds:ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE1 Raw_Read_Error_Rate 0x000f 100 098 051 Pre-fail Always - 03 Spin_Up_Time 0x0007 074 074 011 Pre-fail Always - 85804 Start_Stop_Count 0x0032 097 097 000 Old_age Always - 28165 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 07 Seek_Error_Rate 0x000f 100 100 051 Pre-fail Always - 08 Seek_Time_Performance 0x0025 100 100 015 Pre-fail Offline - 94989 Power_On_Hours 0x0032 097 097 000 Old_age Always - 1408010 Spin_Retry_Count 0x0033 100 100 051 Pre-fail Always - 611 Calibration_Retry_Count 0x0012 100 100 000 Old_age Always - 012 Power_Cycle_Count 0x0032 098 098 000 Old_age Always - 249113 Read_Soft_Error_Rate 0x000e 100 098 000 Old_age Always - 0183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 2932184 End-to-End_Error 0x0033 100 100 099 Pre-fail Always - 0187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 64188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0190 Airflow_Temperature_Cel 0x0022 085 054 000 Old_age Always - 15 (Min/Max 9/15)194 Temperature_Celsius 0x0022 079 051 000 Old_age Always - 21 (Min/Max 9/21)195 Hardware_ECC_Recovered 0x001a 100 100 000 Old_age Always - 35351196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 0199 UDMA_CRC_Error_Count 0x003e 100 100 000 Old_age Always - 27200 Multi_Zone_Error_Rate 0x000a 100 100 000 Old_age Always - 0
201 Soft_Read_Error_Rate 0x000a 253 253 000 Old_age Always - 0
SMART Error Log Version: 1No Errors Logged
SMART Info - Disk 2
SMART Attributes Data Structure revision number: 16Vendor Specific SMART Attributes with Thresholds:ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 03 Spin_Up_Time 0x0027 167 163 021 Pre-fail Always - 66084 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 7235 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 07 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 09 Power_On_Hours 0x0032 091 091 000 Old_age Always - 725810 Spin_Retry_Count 0x0032 100 100 000 Old_age Always - 011 Calibration_Retry_Count 0x0032 100 100 000 Old_age Always - 012 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 721192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 720193 Load_Cycle_Count 0x0032 167 167 000 Old_age Always - 101210194 Temperature_Celsius 0x0022 129 109 000 Old_age Always - 21196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 0199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 0
Is this ok?
What kind of performance are you getting, and what are you expecting? How have you measured the performance?
I made some tests with dd and wasn't taking in consideration the memory of the NAS to explain the performance drop that I stated in the thread.
I am using ReadyNAS to make TimeMachine Backups and to present a NFS share to Raspberry.
I get around 4 MB/s to 5 MB/s using CIFS or NFS. I was expecting around 9 MB/s to 10 MB/s (100 Mbps home network) using CIFS or NFS.
The SMART stats look O.K.A gigabit network is much better than a 100 Megabit one.Have you tested performance with a direct connection to a PC with a gigabit NIC?
