Very Slow Write Speeds but good read speeds

  • Hi All,


    I have noticed since I have started to upload more files to my file server that the speeds for writing are very low.


    I have several SMB shares set-up and these seem to be very slow


    I have a 1g Network card and GB network Switch that shows I'm connected at 1GB. Though my speeds are as follows


    Wireless Write speed 4.7Mbps read speed 25Mbps
    Cables Write Speed 28Mbps and read speed is 359Mbps


    AS you can se the write speed is very low. I have following outputs


    root@snowdon:~# ethtool eth1
    Settings for eth1:
    Supported ports: [ TP MII ]
    Supported link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Half 1000baseT/Full
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Advertised link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Half 1000baseT/Full
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes
    Link partner advertised link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Half 1000baseT/Full
    Link partner advertised pause frame use: Symmetric
    Link partner advertised auto-negotiation: Yes
    Speed: 1000Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000033 (51)
    drv probe ifdown ifup
    Link detected: yes
    root@snowdon:~#

  • ifconfig output
    root@snowdon:/# ifconfig
    eth1 Link encap:Ethernet HWaddr 14:cc:20:06:c7:8b
    inet addr:192.168.0.2 Bcast:192.168.0.255 Mask:255.255.255.0
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:1600703 errors:0 dropped:1377 overruns:0 frame:0
    TX packets:1883157 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:350108308 (333.8 MiB) TX bytes:2366422026 (2.2 GiB)
    Interrupt:20 Base address:0x4c00


    lo Link encap:Local Loopback
    inet addr:127.0.0.1 Mask:255.0.0.0
    inet6 addr: ::1/128 Scope:Host
    UP LOOPBACK RUNNING MTU:16436 Metric:1
    RX packets:7040 errors:0 dropped:0 overruns:0 frame:0
    TX packets:7040 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:1576308 (1.5 MiB) TX bytes:1576308 (1.5 MiB)

    • Offizieller Beitrag

    Check the drive write speeds with dd and check the network speeds with iperf.

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  • perf speeds
    -----------------------------------------------------------
    Client connecting to 192.168.0.4, TCP port 5001
    TCP window size: 23.5 KByte (default)
    ------------------------------------------------------------
    [ 3] local 192.168.0.2 port 44770 connected with 192.168.0.4 port 5001
    [ ID] Interval Transfer Bandwidth
    [ 3] 0.0-10.0 sec 96.5 MBytes 80.8 Mbits/sec

  • Wired speeds


    Client connecting to 192.168.0.2, TCP port 5001
    TCP window size: 129 KByte (default)
    ------------------------------------------------------------
    [ 4] local 192.168.0.48 port 53530 connected with 192.168.0.2 port 5001
    [ ID] Interval Transfer Bandwidth
    [ 4] 0.0-10.0 sec 630 MBytes 528 Mbits/sec
    Lees-iMac:~ Lee$

    • Offizieller Beitrag

    Your dd test needs work. You didn't write anything. You need to change directory to the data drive(s) in question.


    I wouldn't use wireless in an iperf test.

    omv 7.0.4-2 sandworm | 64 bit | 6.5 proxmox kernel

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    • Offizieller Beitrag

    Obviously change long_uuid to the uuid of the data drive you want to test.


    dd if=/dev/zero of=/media/long_uuid/zero.dd bs=1M count=10000 conv=fdatasync
    This will write 10000 1MB blocks to /media/long_uuid and wait for each to finish writing before moving to the next. This takes the system/drive/etc cache out of the equation to show true drive speed.

    omv 7.0.4-2 sandworm | 64 bit | 6.5 proxmox kernel

    plugins :: omvextrasorg 7.0 | kvm 7.0.10 | compose 7.1.2 | k8s 7.0-6 | cputemp 7.0 | mergerfs 7.0.3


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  • Thanks I changed and run as below


    root@snowdon:/media# dd if=/dev/zero of=/media/9250a5d0-517e-409a-8afd-9071d590f6ec/zero.dd bs=1M count=10000 conv=fdatasync
    0+0 records in
    0+0 records out
    0 bytes (0 B) copied, 4.4938e-05 s, 0.0 kB/s

    • Offizieller Beitrag

    Is the drive full or mounted read only?


    df -h
    mount

    omv 7.0.4-2 sandworm | 64 bit | 6.5 proxmox kernel

    plugins :: omvextrasorg 7.0 | kvm 7.0.10 | compose 7.1.2 | k8s 7.0-6 | cputemp 7.0 | mergerfs 7.0.3


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  • re-run again
    root@snowdon:/# dd if=/dev/zero of=/media/9250a5d0-517e-409a-8afd-9071d590f6ec/zero.dd bs=1M count=10000 conv=fdatasync
    10000+0 records in
    10000+0 records out
    10485760000 bytes (10 GB) copied, 132.69 s, 79.0 MB/s

    • Offizieller Beitrag

    While not super fast, your samba speeds should be faster. Try reading the two tuning threads


    Tunning Samba for more speed
    Tuning Samba for more speed 2

    omv 7.0.4-2 sandworm | 64 bit | 6.5 proxmox kernel

    plugins :: omvextrasorg 7.0 | kvm 7.0.10 | compose 7.1.2 | k8s 7.0-6 | cputemp 7.0 | mergerfs 7.0.3


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  • Thanks I changed the following
    Into the SAMBA extras Options


    socket options = TCP_NODELAY SO_RCVBUF=65536 SO_SNDBUF=65536
    read raw = yes
    write raw = yes
    max xmit = 65535
    dead time = 15
    getwd cache = yes
    min protocol = smb2


    Original DD
    root@snowdon:/# dd if=/dev/zero of=/media/9250a5d0-517e-409a-8afd-9071d590f6ec/zero.dd bs=1M count=10000 conv=fdatasync
    10000+0 records in
    10000+0 records out
    10485760000 bytes (10 GB) copied, 132.69 s, 79.0 MB/s


    After changes - AS you can see it
    root@snowdon:/# dd if=/dev/zero of=/media/9250a5d0-517e-409a-8afd-9071d590f6ec/zero.dd bs=1M count=10000 conv=fdatasync
    10000+0 records in
    10000+0 records out
    10485760000 bytes (10 GB) copied, 139.939 s, 74.9 MB/s
    root@snowdon:/#

    • Offizieller Beitrag

    Those changes won't change dd. They should change file transfer speeds over samba.

    omv 7.0.4-2 sandworm | 64 bit | 6.5 proxmox kernel

    plugins :: omvextrasorg 7.0 | kvm 7.0.10 | compose 7.1.2 | k8s 7.0-6 | cputemp 7.0 | mergerfs 7.0.3


    omv-extras.org plugins source code and issue tracker - github


    Please try ctrl-shift-R and read this before posting a question.

    Please put your OMV system details in your signature.
    Please don't PM for support... Too many PMs!

    • Offizieller Beitrag

    Are you using the backports kernel? There is a button to install it in omv-extras.

    omv 7.0.4-2 sandworm | 64 bit | 6.5 proxmox kernel

    plugins :: omvextrasorg 7.0 | kvm 7.0.10 | compose 7.1.2 | k8s 7.0-6 | cputemp 7.0 | mergerfs 7.0.3


    omv-extras.org plugins source code and issue tracker - github


    Please try ctrl-shift-R and read this before posting a question.

    Please put your OMV system details in your signature.
    Please don't PM for support... Too many PMs!

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