[Info-vax] CRTL and RMS vs SSIO

[John Wallace]

On Sunday, 10 October 2021 at 22:54:09 UTC+1, Stephen Hoffman wrote:
> On 2021-10-10 02:13:48 +0000, Lawrence D’Oliveiro said: 
> 
> > On Sunday, October 10, 2021 at 1:44:55 PM UTC+13, Stephen Hoffman wrote: 
> >> Various apps can use range locks or local locking or other 
> >> synchronization for that, but Linux does offer integrated lock 
> >> management support. 
> > 
> > Nothing VMS-style.
> https://linux.die.net/man/3/dlm_lock 
> 
> All of which should look familiar to folks familiar with the OpenVMS 
> DLM and the associated system service calls including $enq.
> >> I don't recall which Linux version first saw lock manager integration, 
> >> but it was a while back. In RHEL clusters running GFS2 for instance, 
> >> that DLM is a fundamental part of file access. 
> > 
> > Might be a Red-Hat-specific feature, then.
> Nope. Bog-standard Linux. DLM has been part of the Linux distro for 
> ~fifteen years, IIRC.
> -- 
> Pure Personal Opinion | HoffmanLabs LLC


DLM a standard part of Linux? But *which* DLM, *which* Linux?

Around fifteen years ago might tie in conveniently with the timing of when HPQ open-sourced important former Tru64 components like its Distributed Lock Manager (which itself was introduced into Tru64 V5, as part of the TruCluster Server), and AdvFS, and other stuff which helped make Tru64 a technologically leading UNIX.

I couldn't quickly find any definitive evidence of this, however. Which may well just be me on a Monday morning.