Whenever things goes haywire on an OS or application there are two areas that are looked at first: In a fair few cases the issue is founded to be external from the host systems but when it comes to performance related problems from a storage perspective the entire IO-stack is at play.
HBA Firmware and Drivers – The Storage Grey Area Read More »
As you may have seen, the first release of my book was published in late September, and I\’ve received a great deal of positive feedback. To the ones who have provided me the constructive feedback, I am most grateful, and I\’ll make sure these are addressed in the 2023 release. One of the most asked
Troubleshooting Linux Storage 2023 Read More »
When you work from home and are required to use the corporate network you\’re often shoved into a dilemma where the VPN configuration that is pushed to your PC results in one of two modes, Full-tunnel or Split-Tunnel. Digging tunnels A full-tunnel configuration is by far the most dreadful especially when your VPN access-point is
Using systemd-resolved to optimise DNS resolution. Read More »
Where did my disks go? So now and then you may run into an issue which cannot be explained properly by just looking at the standard events that show up in \”/var/log/messages\”. Issues such as Oct 7 18:24:20 centos8 kernel: lpfc 0000:81:00.0: 0:1305 Link Down Event xc received Data: xc x20 x800110 x0 x0 Oct
Enabling Verbose Logging on Linux with Emulex Host Bus Adapters Read More »
Intro Third party authentication and authorisation providers like okta, azure, gcs or aws often have a trusted connection to the tenants. This sometimes allows that authentication requests via MFA/2FA options can be bypassed as the authentication has already occured from inside the tennants network. When employees work from remote locations they can set up a
Reducing MFA/2FA requests on cloud apps Read More »
Something none storage related. This article at \”The Register\” triggered me to write this post and explain why I don\’t see this behaviour in my household. The trick is to configure DNS-over-HTTPS in your network. For the non-technical people who read this the title may already be an incentive to not read any further but
NXDOMAIN hijacking and ISP behaviour Read More »
No, not storage related but more towards coding scripts etc and assuring your git repositories do not show up with huge diff sections you need to correct. Just a little tip and a \”note to self\”. If you\’ve event been keen enough to not use an IDE for whatever language you use and kept to
Getting rid of whitespace Read More »
VANTARA. Hitachi Vantara. Yes, took me a while to get used to it as well after almost 15 years at HDS but I must say reading all the internal and external communications and overall business and technical transformation gets me more excited by the day. HDS, Pentaho and Hitachi Insight Group are combined into a
Hitachi Va….. what??? Read More »
The piece of spinning Fe3O4 (ie rust) is by far the slowest piece of equipment in the IO stack. Heck, they didn\’t invent SSD and Flash for nothing, right. To overcome the terrible latency, involved when a host system requests a block of data, there are numerous layers of software and hardware that try to
Performance misconceptions on storage networks Read More »
Six years ago I wrote this article : Open Source Storage in which I described that storage will become \”Software Defined\”. Basically I already predicted SDN before the acronym was even invented. What I did not see coming is that Oracle would buy SUN and by doing that basically killing off the entire \”Open Source\”
Open Source Storage (part 2) Read More »
