Montag, 15. Januar 2018

Performance test: 24 SSD 150 GB Intel on MegaRAID SAS 9361-24i

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No RAID, simply jbod mode dstat results: Reading: lsscsi | grep SSDSC2BB15| awk '{printf"dd if=%s of=/dev/null bs=16K & \n...
Mittwoch, 10. Januar 2018

Lustrefs: a big performance hit on lfs find after patch of: CVE-2017-5754 CVE-2017-5753 CVE-2017-5715

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Disable: sh set-protection.sh 0 time lfs find /lustre/arm2arm/| wc -l 1454706 real    0m14.941s user    0m1.633s sys    0m10.770s  Enabl...

Enable or disable Meltdown and Spectre attack protection on CentOS

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After kernel and microcode update one can enable or disable the protection: Enable: sh ./set-protection.sh 1 or Disable: sh ./set-prote...
Dienstag, 2. Januar 2018

Fixing X11 forwarding on CentOS7.4

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I have an client Centos 6.5 trying to connect to Centos 7.4 with X11 forwarding, but no luck: Finally I found that somehow the important o...
Dienstag, 28. November 2017

Lustre 2.10.x dkms usage

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get the src for the lustre-client-dkms package from the: https://build.hpdd.intel.com/job/lustre-b2_10/arch=x86_64,build_type=client,distr...
Mittwoch, 15. November 2017

Deleting the funny 192.168.122.xxx network from CentOS 7.4

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In order to stop unnecessary interface on the VM:   yum install -y libvirt-client systemctl start  libvirtd  virsh net-destroy default ...
Dienstag, 17. Oktober 2017

Performance consumer nvme ssd vs samsung evo pro SSD

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Micron 1100 256GB M.2 vs Samsung SSD 850 EVO 1TB Micron vs Samsung