today's howtos

posted by Roy Schestowitz on Apr 02, 2023

• Avoiding HTTP/3 (for a while) as a pragmatic default

  One of the unusual things about HTTP/3 is that it doesn't use TCP but instead a new network transport protocol, QUIC, and QUIC operates over UDP. Operating over UDP instead of TCP has a number of consequences; for example, firewalls need adjustments to let 'QUIC' traffic through and the path your QUIC traffic takes may be different than your TCP HTTP traffic. All of this creates many opportunities for different things to happen with HTTP/3 requests than with your TCP HTTP requests. Some of these different things will be one version working and the other not, and since HTTP/3 is the newer and less common version, it's the version most likely to not work.

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• Using DTrace to find block sizes of ZFS, NFS, and iSCSI

  A member of our Storage Team, Cloud Engineer Goran Mekic, shared that documentation and books on DTrace were not terribly helpful to him in finding out what function he should trace. Goran said that he would have been extremely happy if he could refer to a blog post like the one below before starting with his task, so he offered to share the process because it is more important than the measurement itself.

  So in that spirit of sharing – you can download these steps, and walk through Goran’s instructions on finding block sizes of ZFS, NFS, and iSCSI using DTrace below…

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