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<p>Zajímavé. <br>
<br>
Během plně náhodného IO jsme na obou discích zapsali "pouhých" ~
15MiB dat, srovnejme to s velikostí vyrovnávací paměti (pro Váš
SMR 256MB)<br>
Chtěli-li bychom se objemem zapsaných náhodných dat dostat za
velikost vyrov. paměti, musíme dobu běhu navýšit, řádově na 30
minut.</p>
<p>Pokud se Vám chce ještě experimentovat, spusťte toto - čas běhu
30 min..:<br>
</p>
<p>fio --randrepeat=1 --fallocate=none --ioengine=libaio --direct=1
--gtod_reduce=1 --name=test --filename=random_read_write.fio
--bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75
--runtime=1800 --time_based</p>
<p>Ohledně měření různých partitions - partitions jsou konstruktem
operačního systému, tj. o vrstvu výše, nemyslím si, že mají vliv
na práci s vyrovnávací pamětí a fyzickými přístupy na reálných
plotnách.</p>
<p>Samozřejmě ještě zajímavější by bylo pustit fio "na víkend" s
testovacím souborem o velikosti blížící se řádově velikosti disku.</p>
<p>> fio: native_fallocate call failed: Operation not supported <br>
</p>
<p>V příkazu výše už je nativní fallocate zakázaný, takže už by si
to stěžovat nemělo..</p>
<p>Hláška může znamenat že máte nějakou novější implementaci
filesystému v jádře, než je verze fia.. - 3.1 je z roku 2017, to
se klidně mohlo stát.. A nebo to je nějaký FS (fat..? ) kde to
nejde provést..<br>
</p>
<p> </p>
<p>S "nahými" rotačními disky bez RAIDU nebo diskového pole už jsem
dlouho neměl co do činění, asi nahodím starý desktop a udělám taky
pár pokusů..<br>
</p>
<p>JD</p>
<p><br>
</p>
<p>html tabulka s vašimi daty<br>
</p>
<p> </p>
<table cellspacing="0" border="0">
<colgroup width="206"></colgroup> <colgroup width="85" span="7"></colgroup>
<tbody>
<tr>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" height="17" align="left"><font
face="Ubuntu Mono"><br>
</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left"><font face="Ubuntu Mono"><br>
</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">read</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">write</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">R
ops</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">W
ops</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left">W data</td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left">disk cache</td>
</tr>
<tr>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" height="17" align="center"><font
face="Ubuntu Mono">HW</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left"><font face="Ubuntu Mono">partition</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">KiB/s</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">KiB/s</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">IOPS</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="center"><font face="Ubuntu Mono">IOPS</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left">MiB</td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left">MB</td>
</tr>
<tr>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" height="17" align="left"><font
face="Ubuntu Mono">Disk Seagate ST2000DM008</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left"><font face="Ubuntu Mono">100GB</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">602</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">202</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">150</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">50</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right">11.9</td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><b><font face="Liberation
Serif">256</font></b></td>
</tr>
<tr>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" height="17" align="left"><font
face="Ubuntu Mono">Disk Seagate ST2000DM008</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left"><font face="Ubuntu Mono">900GB</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">718</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">239</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">179</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">59</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right">14.1</td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><b><font face="Liberation
Serif">256</font></b></td>
</tr>
<tr>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" height="17" align="left"><font
face="Ubuntu Mono">Seagate 2 TB noname srv</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left"><font face="Ubuntu Mono">100GB</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">712</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">238</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">178</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">59</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right">14</td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left">?</td>
</tr>
<tr>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" height="17" align="left"><font
face="Ubuntu Mono">Seagate 2 TB noname srv</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left"><font face="Ubuntu Mono">900GB</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">687</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">230</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">171</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right"><font face="Ubuntu Mono">57</font></td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="right">13.5</td>
<td style="border-top: 1px solid #000000; border-bottom: 1px
solid #000000; border-left: 1px solid #000000; border-right:
1px solid #000000" align="left">?</td>
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