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ok.. let me give some more context.. <br>
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all inodes are in a (single) inode file.. <br>
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so ... depending on the blocksize .. lets say ... 1MB ... you can have 256 inodes (in case of 4K inode size) ... in one block...
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in Peter's case .. 1 MB block would hold 512 inodes... <br>
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the total number of allocated file system blocks of the inode file is a bit more complex ... off topic here<br>
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to be clear .. the waste of space does not come from having small inode size/or mismatch of subblocksize ... itself.. the worst case (which is negligible) there is n unused fragment
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its more.. that small file's data can't (or less likely) written into the inode (data in inode) .. (( please note the good remark from Ed , only possible at all, - if there is no encryption ))
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so in Peter's case .. a file , that has , lets say 2.x KB ... can't be written into the inode... and so a file system block needs to be allocated..</div>
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if it is a new file.. a full block gets allocated first and then, on close of the file.. the size will be truncated to the next matching sub blocksize boundary</div>
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so .. performance wise.. that adds latency and space wise.. this could be avoided .. (if the file's data fits into the inode)<br>
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to be more accurate and correct, the best answer would have been .. it depends 😉 .. on the data structure...
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Am 02. 08. 2023 um 13: 42 schrieb Olaf Weiser <olaf. weiser@ de. ibm. com>: Hallo Peter, [1] [. . . ] having a smaller inode size than the subblock size means there's a big wastage on disk usage, with no performance benefit to doing so[. . . ] in
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<div>Am 02.08.2023 um 13:42 schrieb Olaf Weiser <olaf.weiser@de.ibm.com>:</div>
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Hallo Peter,<span class="x_Apple-converted-space"> </span><br>
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<span class="x_x_elementToProof" style="font-family:Arial,Helvetica,sans-serif; font-size:10pt"><span class="x_ContentPasted0"><span class="x_x_ContentPasted0 x_ContentPasted0" style="display: inline !important; background-color: rgb(255, 255, 255);">[1]<span class="x_Apple-converted-space"> </span><i>[...]
having a smaller inode size than the subblock size means</i></span><i> there's a big wastage on disk usage, with no performance benefit to doing so[...]<span class="x_Apple-converted-space"> </span><br>
</i></span></span></div>
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<span class="x_x_elementToProof" style="font-family:Arial,Helvetica,sans-serif; font-size:10pt"><span class="x_ContentPasted0">in short - yes 😉<span class="x_Apple-converted-space"> </span><br>
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<div>The expectation that there is a waste in space seems to come from the idea that inodes are stored as individual files - which then can’t be smaller than a subblock. </div>
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<div>Referring to:</div>
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<div>Slide 21: „Held in one invisible inode file…“</div>
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<div>-> I would understand from that that 2kiB inodes are just ligned up in a single file and worst case you lose 2kiB because you don’t completely match your 4kiB inodes</div>
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<div>Jan</div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size: 11pt; color: rgb(0, 0, 0);" face="Calibri, sans-serif"><b>Von:</b> gpfsug-discuss <gpfsug-discuss-bounces@gpfsug.org> im Auftrag von Jan Heichler <jan.heichler@gmx.net><br>
<b>Gesendet:</b> Mittwoch, 2. August 2023 15:09<br>
<b>An:</b> gpfsug main discussion list <gpfsug-discuss@gpfsug.org><br>
<b>Betreff:</b> [EXTERNAL] Re: [gpfsug-discuss] Inode size, and system pool subblock</font>
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Am 02. 08. 2023 um 13: 42 schrieb Olaf Weiser <olaf. weiser@ de. ibm. com>: Hallo Peter, [1] [. . . ] having a smaller inode size than the subblock size means there's a big wastage on disk usage, with no performance benefit to doing so[. . . ] in
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<div>Am 02.08.2023 um 13:42 schrieb Olaf Weiser <olaf.weiser@de.ibm.com>:</div>
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Hallo Peter,<span class="x_Apple-converted-space"> </span><br>
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<span class="x_x_elementToProof" style="font-family:Arial,Helvetica,sans-serif; font-size:10pt"><span class="x_ContentPasted0"><span class="x_x_ContentPasted0 x_ContentPasted0" style="display: inline !important; background-color: rgb(255, 255, 255);">[1]<span class="x_Apple-converted-space"> </span><i>[...]
having a smaller inode size than the subblock size means</i></span><i> there's a big wastage on disk usage, with no performance benefit to doing so[...]<span class="x_Apple-converted-space"> </span><br>
</i></span></span></div>
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<span class="x_x_elementToProof" style="font-family:Arial,Helvetica,sans-serif; font-size:10pt"><span class="x_ContentPasted0">in short - yes 😉<span class="x_Apple-converted-space"> </span><br>
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<div>The expectation that there is a waste in space seems to come from the idea that inodes are stored as individual files - which then can’t be smaller than a subblock. </div>
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<div>Referring to:</div>
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<div>Slide 21: „Held in one invisible inode file…“</div>
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<div>-> I would understand from that that 2kiB inodes are just ligned up in a single file and worst case you lose 2kiB because you don’t completely match your 4kiB inodes</div>
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<div>Jan</div>
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