| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, David Christensen <david(dot)christensen(at)crunchydata(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Stephen Frost <sfrost(at)snowman(dot)net> |
| Subject: | Re: Initdb-time block size specification |
| Date: | 2023-06-30 23:04:57 |
| Message-ID: | 20230630230457.vsryms45p7b2vjae@awork3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2023-06-30 18:58:20 -0400, Bruce Momjian wrote:
> > [1] On linux I think you need to use stat() to figure out the st_dev for a
> > file, then look in /proc/self/mountinfo for the block device, use the name
> > of the file to look in /sys/block/$d/queue/physical_block_size.
>
> I just got a new server:
>
> https://momjian.us/main/blogs/blog/2023.html#June_28_2023
>
> so tested this on my new M.2 NVME storage device:
>
> $ /sys/block/nvme0n1/queue/physical_block_size
> 262144
Ah, I got the relevant filename wrong. I think it's logical_block_size, not
physical one (that's the size of addressing). I didn't realize because the
devices I looked at have the same...
Regards,
Andres
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