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I'm using Ubuntu 16.04 LTS where the OS resides on a SSD. I also have three harddisks (3 TB, 3 TB, and 500 GB) and whenever I copy something from the SSD or another HDD to one of the three HDDs I only get about 35 MB/s write speed. Only when copying from a HDD to the SSD i get around 120 MB/s performance.
The SSD and one HDD are on the internal SATA3 connector, the other two HDDs on a Mini PCIe SATA2 adapter, so the problem doesn't seem to come from the controllers and as the HDDs are from different manufactures they also can be ruled out as the culprit.
hdparm -i gives me the following output:
Model=TOSHIBA DT01ACA300, FwRev=MX6OABB0, SerialNo=xxxxxxxx
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=56
BuffType=DualPortCache, BuffSize=unknown, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=5860533168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-2,3,4,5,6,7
Model=WDC WD5000AAJS-00A8B0, FwRev=01.03B01, SerialNo=xxxxxxxx
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=50
BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=976773168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7
hdparm -t -T gives me:
Timing cached reads: 3582 MB in 2.00 seconds = 1791.09 MB/sec
Timing buffered disk reads: 280 MB in 3.02 seconds = 92.74 MB/sec
The HDDs are using NTFS, mounted via fstab. I just read that the big_writes option could help with NTFS write performance. Can this option be added to fstab? If so, where would it be placed?
Hannes Binder
Posted 2018-08-02T10:43:37.687
Reputation: 31
What filesystems are involved? (e.g. NTFS performs poorly in Linux, I think). Any compression or encryption on the fly? FUSE? What does
hdparm -t -Tsay? Please [edit] the question to add information. – Kamil Maciorowski – 2018-08-02T10:49:05.8231Please see how I improved the formatting of your question before; use the same syntax for your new edits. We often format new users' questions or answers and it's OK. At the same time we expect them to learn, so they can write readable posts themselves. Use my edit as an example, learn and improve the formatting of what you have added. Thank you. And welcome to Super User. – Kamil Maciorowski – 2018-08-02T11:12:45.400
1Your question gave me a good hint, I added big_writes to fstab as I'm using NTFS, now I get 48MB/s. But it seems that the J1900 CPU seems to get maxed out anyways, so it very probably is the CPU+NTFS combination that slows things down... – Hannes Binder – 2018-08-02T11:13:16.003
Okay thank you Kamil! I'll have a look at it so hopefully next time I won't have formatting issues. – Hannes Binder – 2018-08-02T11:14:28.227