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To: bashtanov@imap.cc
Cc: pgsql-performance@postgresql.org
References: 
Subject: Re: How to prioritise walsender reading from pg_wal over WAL writes?
From: Alexey Bashtanov <bashtanov@imap.cc>
Message-ID: <774ec1b8-c7c6-cfa2-098d-5c6a32dcfc1a@imap.cc>
Date: Wed, 18 Nov 2020 11:54:33 +0000
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If it helps, here's the details of the hardware config.
The controller is |AVAGO MegaRAID SAS 9361-4i|,
the SSDs are |INTEL SSDSC2KG960G8| (configured as a raid1).
Current scheduler used is deadline.
Currently XFS is mounted without nobarriers, but I'm going to set that 
when there's high load next time to see how it affects throughput.

Properties of the array

VD6 Properties :
==============
Strip Size = 256 KB
Number of Blocks = 1874329600
VD has Emulated PD = Yes
Span Depth = 1
Number of Drives Per Span = 2
Write Cache(initial setting) = WriteBack
Disk Cache Policy = Disk's Default
Encryption = None
Data Protection = Disabled
Active Operations = None
Exposed to OS = Yes
Creation Date = 28-10-2020
Creation Time = 05:17:16 PM
Emulation type = default
Cachebypass size = Cachebypass-64k
Cachebypass Mode = Cachebypass Intelligent
Is LD Ready for OS Requests = Yes
SCSI NAA Id = 600605b00af03650272c641ca30c3196

Best, Alex

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    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
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  <body>
    <div class="moz-text-html" lang="x-unicode">
      <div class="c-message_kit__blocks
        c-message_kit__blocks--rich_text">
        <div class="c-message__message_blocks
          c-message__message_blocks--rich_text">
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              p-block_kit_renderer__block_wrapper--first">
              <div class="p-rich_text_block" dir="auto">
                <div class="p-rich_text_section">If it helps, here's the
                  details of the hardware config.<br>
                  The controller is <code data-stringify-type="code"
                    class="c-mrkdwn__code">AVAGO MegaRAID SAS 9361-4i</code>,<br>
                  the SSDs are <code data-stringify-type="code"
                    class="c-mrkdwn__code">INTEL SSDSC2KG960G8</code>
                  (configured as a raid1).<br>
                  Current scheduler used is deadline.<span
                    class="c-mrkdwn__br"
                    data-stringify-type="paragraph-break"></span><br>
                  Currently XFS is mounted without nobarriers, but I'm
                  going to set that when there's high load next time to
                  see how it affects throughput.<br>
                  <br>
                  Properties of the array<span class="c-mrkdwn__br"
                    data-stringify-type="paragraph-break"></span>
                  <pre class="c-mrkdwn__pre" data-stringify-type="pre">VD6 Properties :
==============
Strip Size = 256 KB
Number of Blocks = 1874329600
VD has Emulated PD = Yes
Span Depth = 1
Number of Drives Per Span = 2
Write Cache(initial setting) = WriteBack
Disk Cache Policy = Disk's Default
Encryption = None
Data Protection = Disabled
Active Operations = None
Exposed to OS = Yes
Creation Date = 28-10-2020
Creation Time = 05:17:16 PM
Emulation type = default
Cachebypass size = Cachebypass-64k
Cachebypass Mode = Cachebypass Intelligent
Is LD Ready for OS Requests = Yes
SCSI NAA Id = 600605b00af03650272c641ca30c3196

</pre>
                  Best, Alex</div>
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