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--></style></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt'>I ran the latest command you provided and it does not show the parameter, like you see. I can do screenshare. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>[opc@lustre-client-1 ~]$ df -h<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>Filesystem Size Used Avail Use% Mounted on<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>/dev/sda3 39G 2.5G 36G 7% /<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>devtmpfs 158G 0 158G 0% /dev<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>tmpfs 158G 0 158G 0% /dev/shm<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>tmpfs 158G 17M 158G 1% /run<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>tmpfs 158G 0 158G 0% /sys/fs/cgroup<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>/dev/sda1 512M 12M 501M 3% /boot/efi<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>10.0.3.6@tcp1:/lfsbv 50T 89M 48T 1% /mnt/mdt_bv<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>10.0.3.6@tcp1:/lfsnvme 185T 8.7M 176T 1% /mnt/mdt_nvme<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>tmpfs 32G 0 32G 0% /run/user/1000<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>[opc@lustre-client-1 ~]$ lctl list_param -R llite | grep max_read_ahead<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>[opc@lustre-client-1 ~]$<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>So I ran this: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>[opc@lustre-client-1 ~]$ lctl list_param -R llite > llite_parameters.txt<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'>There are other parameters under llite. I attached the complete list. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='color:black'>From: </span></b><span style='color:black'>"Moreno Diego (ID SIS)" <diego.moreno@id.ethz.ch><br><b>Date: </b>Friday, December 13, 2019 at 8:36 AM<br><b>To: </b>Pinkesh Valdria <pinkesh.valdria@oracle.com>, "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br><b>Subject: </b>Re: [lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt'>From what I can see I think you just ran the wrong command (</span><span style='font-size:9.0pt;font-family:Menlo;color:black;background:white'>lctl list_param -R * </span><span style='font-size:11.0pt'>) or it doesn’t work as you expected on 2.12.3.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt'>But llite params are sure there on a *<b>mounted</b>* Lustre client. </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt'>This will give you the parameters you’re looking for and need to modify to have, likely, better read performance:</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt'>lctl list_param -R llite | grep max_read_ahead</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt'> </span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><b><span style='color:black'>From: </span></b><span style='color:black'>Pinkesh Valdria <pinkesh.valdria@oracle.com><br><b>Date: </b>Friday, 13 December 2019 at 17:33<br><b>To: </b>"Moreno Diego (ID SIS)" <diego.moreno@id.ethz.ch>, "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br><b>Subject: </b>Re: [lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)</span><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p></div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'>This is how I installed lustre clients (only showing packages installed steps). </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>cat > /etc/yum.repos.d/lustre.repo << EOF</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>[hpddLustreserver]</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>name=CentOS- - Lustre</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>baseurl=<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__downloads.whamcloud.com_public_lustre_latest-2Drelease_el7_server_&d=DwQGaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=HpfvG0tozSl7HgJJuyxxo2149EjwqpQDE7ytv-4sZuI&m=4JVRl3NLgV0mYqKJxItBPtSpqgV0NdOryLQavGC9UEQ&s=U9NFtbOC4b2VXBIp1MenZbObM5k4GGL8SftoN3cwJmg&e=">https://downloads.whamcloud.com/public/lustre/latest-release/el7/server/</a></span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>gpgcheck=</span><span style='font-size:9.0pt;font-family:Menlo;color:#272AD8'>0</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Helvetica;color:black'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>[e2fsprogs]</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>name=CentOS- - Ldiskfs</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>baseurl=<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__downloads.whamcloud.com_public_e2fsprogs_latest_el7_&d=DwQGaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=HpfvG0tozSl7HgJJuyxxo2149EjwqpQDE7ytv-4sZuI&m=4JVRl3NLgV0mYqKJxItBPtSpqgV0NdOryLQavGC9UEQ&s=EIdVmiD8kQYOGKmB7pyI8tR4ibOIsFW10lryhGoQd2U&e=">https://downloads.whamcloud.com/public/e2fsprogs/latest/el7/</a></span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>gpgcheck=</span><span style='font-size:9.0pt;font-family:Menlo;color:#272AD8'>0</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Helvetica;color:black'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>[hpddLustreclient]</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>name=CentOS- - Lustre</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>baseurl=<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__downloads.whamcloud.com_public_lustre_latest-2Drelease_el7_client_&d=DwQGaQ&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=HpfvG0tozSl7HgJJuyxxo2149EjwqpQDE7ytv-4sZuI&m=4JVRl3NLgV0mYqKJxItBPtSpqgV0NdOryLQavGC9UEQ&s=UdgVbfvDPd-yy02c-nwyI99COZ1reJNvfcxqqYVzMrM&e=">https://downloads.whamcloud.com/public/lustre/latest-release/el7/client/</a></span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>gpgcheck=</span><span style='font-size:9.0pt;font-family:Menlo;color:#272AD8'>0</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>EOF</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>yum install lustre-client -y</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>reboot</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><b><span style='color:black'>From: </span></b><span style='color:black'>"Moreno Diego (ID SIS)" <diego.moreno@id.ethz.ch><br><b>Date: </b>Friday, December 13, 2019 at 2:55 AM<br><b>To: </b>Pinkesh Valdria <pinkesh.valdria@oracle.com>, "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br><b>Subject: </b>Re: [lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)</span><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p></div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'>From what I can see they exist on my 2.12.3 client node:</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'>[root@rufus4 ~]# lctl list_param -R llite | grep max_read_ahead</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'>llite.reprofs-ffff9f7c3b4a8800.max_read_ahead_mb</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'>llite.reprofs-ffff9f7c3b4a8800.max_read_ahead_per_file_mb</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'>llite.reprofs-ffff9f7c3b4a8800.max_read_ahead_whole_mb</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'>Regards,</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;color:black'>Diego</span><o:p></o:p></p></div><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:1.0in'><b><span style='color:black'>From: </span></b><span style='color:black'>Pinkesh Valdria <pinkesh.valdria@oracle.com><br><b>Date: </b>Wednesday, 11 December 2019 at 17:46<br><b>To: </b>"Moreno Diego (ID SIS)" <diego.moreno@id.ethz.ch>, "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br><b>Subject: </b>Re: [lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)</span><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p></div><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>I was not able to find those parameters on my client nodes, OSS or MGS nodes. Here is how I was extracting all parameters . </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>mkdir -p lctl_list_param_R/</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>cd lctl_list_param_R/</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in;background:white'><span style='font-size:9.0pt;font-family:Menlo;color:black'>lctl list_param -R * > lctl_list_param_R</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>[opc@lustre-client-1 lctl_list_param_R]$ less lctl_list_param_R | grep ahead</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsbv-ffff98231c3bc000.statahead_agl</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsbv-ffff98231c3bc000.statahead_max</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsbv-ffff98231c3bc000.statahead_running_max</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsnvme-ffff98232c30e000.statahead_agl</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsnvme-ffff98232c30e000.statahead_max</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsnvme-ffff98232c30e000.statahead_running_max</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>[opc@lustre-client-1 lctl_list_param_R]$</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>I also tried these commands: </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:11.0pt'> </span></b><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:11.0pt'>Not working: </span></b><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:11.0pt'>On client nodes</span></b><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>lctl get_param llite.lfsbv-*.max_read_ahead_mb</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>error: get_param: param_path 'llite/lfsbv-*/max_read_ahead_mb': No such file or directory</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>[opc@lustre-client-1 lctl_list_param_R]$</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:11.0pt'> </span></b><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:11.0pt'>Works </span></b><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><b><span style='font-size:11.0pt'>On client nodes</span></b><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>lctl get_param llite.*.statahead_agl</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsbv-ffff98231c3bc000.statahead_agl=1</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>llite.lfsnvme-ffff98232c30e000.statahead_agl=1</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>[opc@lustre-client-1 lctl_list_param_R]$</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:1.0in'><b><span style='color:black'>From: </span></b><span style='color:black'>"Moreno Diego (ID SIS)" <diego.moreno@id.ethz.ch><br><b>Date: </b>Tuesday, December 10, 2019 at 2:06 AM<br><b>To: </b>Pinkesh Valdria <pinkesh.valdria@oracle.com>, "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br><b>Subject: </b>Re: [lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)</span><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p></div><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>With that kind of degradation performance on read I would immediately think on llite’s max_read_ahead parameters on the client. Specifically these 2:</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>max_read_ahead_mb: total amount of MB allocated for read ahead, usually quite low for bandwidth benchmarking purposes and when there’re several files per client</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>max_read_ahead_per_file_mb: the default is quite low for 16MB RPCs (only a few RPCs per file)</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>You probably need to check the effect increasing both of them.</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'>Regards,</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><div><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;color:black'>Diego</span><o:p></o:p></p></div><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:1.5in'><b><span style='color:black'>From: </span></b><span style='color:black'>lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Pinkesh Valdria <pinkesh.valdria@oracle.com><br><b>Date: </b>Tuesday, 10 December 2019 at 09:40<br><b>To: </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br><b>Subject: </b>[lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)</span><o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p></div><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'>I was expecting better or same read performance with Large Bulk IO (16MB RPC), but I see degradation in performance. Do I need to tune any other parameter to benefit from Large Bulk IO? Appreciate if I can get any pointers to troubleshoot further. </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><b><span style='font-size:11.0pt'>Throughput before </span></b><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l2 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt'>Read: 2563 MB/s</span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l2 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt'>Write: 2585 MB/s</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><b><span style='font-size:11.0pt'>Throughput after</span></b><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt'>Read: 1527 MB/s. (down by ~1025)</span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt'>Write: 2859 MB/s</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><b><span style='font-size:11.0pt'>Changes I did are: </span></b><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'>On oss</span><o:p></o:p></p><p class=p1 style='margin-left:2.0in;text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span style='font-family:"Calibri",sans-serif'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><i>lctl set_param obdfilter.lfsbv-*.brw_size=16</i><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'>On clients </span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l3 level1 lfo6'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt'>unmounted and remounted</span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l3 level1 lfo6'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:10.0pt'>lctl set_param <i>osc.lfsbv-OST*.max_pages_per_rpc</i>=4096 (got auto-updated after re-mount)</span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l3 level1 lfo6'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt'>lctl set_param osc.*.max_rpcs_in_flight=64 (Had to manually increase this to 64, since after re-mount, it was auto-set to 8, but read/write performance was poor)</span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l3 level1 lfo6'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt'>lctl set_param osc.*.max_dirty_mb=2040. (setting the value to 2048 was failing with : Numerical result out of range error. Previously it was set to 2000 when I got good performance. </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt;color:black'>My other settings: </span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l0 level1 lfo8;background:white'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:9.0pt;font-family:Menlo;color:black'>lnetctl net add --net tcp1 --if $interface –peer-timeout 180 –peer-credits 128 –credits 1024</span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l0 level1 lfo8;background:white'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:9.0pt;font-family:Menlo;color:black'>echo "options ksocklnd nscheds=10 sock_timeout=100 credits=2560 peer_credits=63 enable_irq_affinity=0" > /etc/modprobe.d/ksocklnd.conf</span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:2.0in;text-indent:-.25in;mso-list:l0 level1 lfo8;background:white'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:9.0pt;font-family:Menlo;color:black'>lfs setstripe -c 1 -S 1M /mnt/mdt_bv/test1</span><o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'><span style='font-size:11.0pt'> </span><o:p></o:p></p></div></body></html>