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From: Ron Johnson <ronljohnsonjr@gmail.com>
Date: Mon, 15 Jul 2024 22:26:26 -0400
Message-ID: <CANzqJaA-Z3p1Bsv2EP=GCswEJG7Xjvu_ZZjuGMh=sh=_fkPO6Q@mail.gmail.com>
Subject: Re: PostgreSQL Active-Active Clustering
To: "pgsql-generallists.postgresql.org" <pgsql-general@lists.postgresql.org>
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On Mon, Jul 15, 2024 at 5:54=E2=80=AFPM Christoph Moench-Tegeder <cmt@burgg=
raben.net>
wrote:

> ## Ron Johnson (ronljohnsonjr@gmail.com):
>
> > This "lack of products" puzzles me, because DEC was doing this with VAX
> > (then Alpha and Itanium) clusters 40 years ago via a Distributed Lock
> > Manager integrated deep into VMS.  Their Rdb and (CODASYL) DBMS product=
s
>
> Tech and trade-offs have changed over the last 40 years :)
> These days you can so many cores in one package, while "more than one
> processor" was quite a feat in the 80ies ("A dual processor VAX 11/780",
> 1982 https://dl.acm.org/doi/10.5555/800048.801738; also the 11/782 and
> 11/784), and you get so much RAM and storage (even fast storage, if
> you keep it local) with that package. Response Latency really jumps
> if you have to communicate with anything outside your box.
> While latency matters, the number of problems where you absolutely
> need that distributed lock manager has not really grown that much,
> I think.


 Customers still want High Availability, and VMS Clusters were great for
HA.

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<div dir=3D"ltr"><div dir=3D"ltr">On Mon, Jul 15, 2024 at 5:54=E2=80=AFPM C=
hristoph Moench-Tegeder &lt;<a href=3D"mailto:cmt@burggraben.net">cmt@burgg=
raben.net</a>&gt; wrote:<br></div><div class=3D"gmail_quote"><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex">## Ron Johnson (<a href=3D"mailto:ronlj=
ohnsonjr@gmail.com" target=3D"_blank">ronljohnsonjr@gmail.com</a>):<br>
<br>
&gt; This &quot;lack of products&quot; puzzles me, because DEC was doing th=
is with VAX<br>
&gt; (then Alpha and Itanium) clusters 40 years ago via a Distributed Lock<=
br>
&gt; Manager integrated deep into VMS.=C2=A0 Their Rdb and (CODASYL) DBMS p=
roducts<br>
<br>
Tech and trade-offs have changed over the last 40 years :)<br>
These days you can so many cores in one package, while &quot;more than one<=
br>
processor&quot; was quite a feat in the 80ies (&quot;A dual processor VAX 1=
1/780&quot;,<br>
1982 <a href=3D"https://dl.acm.org/doi/10.5555/800048.801738" rel=3D"norefe=
rrer" target=3D"_blank">https://dl.acm.org/doi/10.5555/800048.801738</a>; a=
lso the 11/782 and<br>
11/784), and you get so much RAM and storage (even fast storage, if<br>
you keep it local) with that package. Response Latency really jumps<br>
if you have to communicate with anything outside your box.<br>
While latency matters, the number of problems where you absolutely<br>
need that distributed lock manager has not really grown that much,<br>
I think.</blockquote><div><br></div><div>=C2=A0Customers still want High Av=
ailability, and VMS Clusters were great for HA.=C2=A0</div></div></div>

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