<br><br><font size=2 face="sans-serif">Hi Alex, </font><br><font size=2 face="sans-serif">not 100% sure about my answer.. but
so far as I see it.. it is working, because of the so called "dito
resolution " .. In the snaphost's inode .. die pointer to the DA's
point the the next (more recent) inode information .. </font><br><font size=2 face="sans-serif">so accessing a file in a snapshot- "redirects"
the request to the origin inode - and there ..the information about compression
is given and points to the origin DA</font><br><br><font size=2 face="sans-serif">(of course.. only as long nobody changed
the file since the snapshot was taken)</font><br><br><br><br><br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">"Alexander Wolf"
<A.Wolf-Reber@de.ibm.com></font><br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">gpfsug-discuss@spectrumscale.org</font><br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">11/28/2019 07:03 AM</font><br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">[EXTERNAL] Re:
[gpfsug-discuss] Compression question</font><br><font size=1 color=#5f5f5f face="sans-serif">Sent by:
</font><font size=1 face="sans-serif">gpfsug-discuss-bounces@spectrumscale.org</font><br><hr noshade><br><br><br><font size=2 face="Arial">I see the same behavior of mmlsattr on my
system (with some post 5.0.4 development build). Funny enough if I look
at the file content in the snapshot it gets properly decompressed.</font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">Mit freundlichen Grüßen / Kind regards</font><font size=2 face="sans-serif"></font><p><img src=cid:_4_DEB17BD4DEB177B80052596E872584C0 style="border:0px solid;"><p><table width=697 style="border-collapse:collapse;"><tr height=8><td width=202 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><img src=cid:_4_DEB18B14DEB187280052596E872584C0 alt="IBM Spectrum Scale" style="border:0px solid;"><br><font size=2 face="sans-serif"> </font><td width=31 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><font size=3 face="sans-serif">
</font><td width=464 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><font size=3 face="Arial"><b>Dr.
Alexander Wolf-Reber</b></font><font size=1 face="Arial"><br>Spectrum Scale Release Lead Architect<br>Department M069 / Spectrum Scale Software Development<br><br>+49-160-90540880<br>a.wolf-reber@de.ibm.com</font></table><br><img src=cid:_4_DEB19CD4DEB180B40052596E872584C0 style="border:0px solid;"><br><a href="https://www.ibm.com/privacy/us/en/" target="_blank"><font size=2 color=blue face="Arial"><u>IBM
Data Privacy Statement</u></font></a><p><font size=1 color=#a2a2a2 face="Arial">IBM Deutschland Research &
Development GmbH / Vorsitzende des Aufsichtsrats: Matthias Hartmann / Geschäftsführung:
Dirk Wittkopp<br>Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart,
HRB 243294</font><p><font size=2 face="Arial"> </font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">----- Original message -----<br>From: "Luis Bolinches" <luis.bolinches@fi.ibm.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: "gpfsug main discussion list" <gpfsug-discuss@spectrumscale.org><br>Cc:<br>Subject: [EXTERNAL] Re: [gpfsug-discuss] Compression question<br>Date: Thu, Nov 28, 2019 14:00<br> <br>Which version are you running? </font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">I was involved on a big for compressed file
sets and snapshots that were related to what you see. <br> </font><br><font size=2 face="Arial">-- </font><br><font size=2 face="Arial">Cheers</font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">On 28. Nov 2019, at 14.57, Cregan, Bob <b.cregan@imperial.ac.uk>
wrote:<br> </font><br><font size=2 face="Arial"> </font><br><font size=3 face="Calibri">Hi </font><br><font size=3 face="Calibri"> Sounds logical - except
the snap metadata does not have the compression flag set. So if the inode
now points to a set of compressed blocks how does the client know to decompress
it?</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">After compression of an existing file we
get in the snap</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">-bash-4.2$ mmlsattr -L .snapshots/@GMT-2019.11.27-19.30.14/UserGuide_13.06.pdf</font><br><font size=3 face="Calibri">file name:
.snapshots/@GMT-2019.11.27-19.30.14/UserGuide_13.06.pdf</font><br><font size=3 face="Calibri">metadata replication: 2 max 2</font><br><font size=3 face="Calibri">data replication: 1 max 3</font><br><font size=3 face="Calibri">immutable:
no</font><br><font size=3 face="Calibri">appendOnly:
no</font><br><font size=3 face="Calibri">flags:
</font><br><font size=3 face="Calibri">storage pool name: sata1</font><br><font size=3 face="Calibri">fileset name:
userdirs</font><br><font size=3 face="Calibri">snapshot name: @GMT-2019.11.27-19.30.14</font><br><font size=3 face="Calibri">creation time: Tue
Mar 5 16:16:40 2019</font><br><font size=3 face="Calibri">Misc attributes: ARCHIVE</font><br><font size=3 face="Calibri">Encrypted:
no</font><p><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> and the original file is definitely
compressed.</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">-bash-4.2$ mmlsattr -L UserGuide_13.06.pdf
</font><br><font size=3 face="Calibri">file name:
UserGuide_13.06.pdf</font><br><font size=3 face="Calibri">metadata replication: 2 max 2</font><br><font size=3 face="Calibri">data replication: 1 max 3</font><br><font size=3 face="Calibri">immutable:
no</font><br><font size=3 face="Calibri">appendOnly:
no</font><br><font size=3 face="Calibri">flags:
</font><br><font size=3 face="Calibri">storage pool name: sata1</font><br><font size=3 face="Calibri">fileset name:
userdirs</font><br><font size=3 face="Calibri">snapshot name: </font><br><font size=3 face="Calibri">creation time: Tue
Mar 5 16:16:40 2019</font><br><font size=3 face="Calibri">Misc attributes: ARCHIVE
COMPRESSION (library z)</font><br><font size=3 face="Calibri">Encrypted:
no</font><p><font size=3 face="Calibri">Bob</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=2 color=#0082bf face="Arial"><b>Bob Cregan</b></font><font size=2 face="Arial"><br>HPC Systems Analyst</font><br><font size=2 face="Arial">Information & Communication Technologies</font><br><font size=2 face="Arial">Imperial College London, <br>South Kensington Campus London, SW7 2AZ<br>T: 07712388129<br>E: b.cregan@imperial.ac.uk</font><br><font size=2 face="Arial">W: </font><a href="http://www.imperial.ac.uk/ict/rcs" target="_blank"><font size=2 color=blue face="Arial"><u>www.imperial.ac.uk/ict/rcs</u></font></a><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"><Outlook-1505984389.png></font><br><font size=3 face="Calibri"> </font><font size=2 face="Arial">@imperialRCS
@imperialRSE</font><font size=3 face="Calibri"> </font><p><font size=3 face="Calibri"> </font><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"><Outlook-1505983882.png></font><br><font size=3 face="Calibri"> </font><p><font size=3 face="Calibri"> </font><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><p><font size=2 face="Arial"> </font><br><hr><br><font size=2 face="Calibri"><b>From:</b> gpfsug-discuss-bounces@spectrumscale.org
<gpfsug-discuss-bounces@spectrumscale.org> on behalf of Daniel Kidger
<daniel.kidger@uk.ibm.com><b><br>Sent:</b> 28 November 2019 12:30<b><br>To:</b> gpfsug-discuss@spectrumscale.org <gpfsug-discuss@spectrumscale.org><b><br>Cc:</b> gpfsug-discuss@spectrumscale.org <gpfsug-discuss@spectrumscale.org><b><br>Subject:</b> Re: [gpfsug-discuss] Compression question</font><font size=2 face="Arial"></font><br><font size=2 face="Arial"> </font><table width=630 style="border-collapse:collapse;"><tr height=8><td width=622 bgcolor=#ffffcc style="border-style:ridge ridge ridge ridge;border-color:#F0F0F0;border-width:3px 3px 3px 3px;padding:0px 0px;"><font size=2 color=red face="Arial">Caution
</font><font size=2 face="Arial">- This email from daniel.kidger@uk.ibm.com
originated outside Imperial </font></table><p><font size=2 face="Arial"> </font><p><font size=1 face="Arial">Alexander,</font><br><font size=1 face="Arial"> </font><br><font size=1 face="Arial">Can you then confirm then that the inodes
in the snapshot will now point to fewer but compressed blocks ?</font><br><font size=1 face="Arial">Daniel</font><br><font size=1 face="Arial"> </font><br><font size=3 color=#00bfff face="Arial">_________________________________________________________</font><font size=2 color=#808080 face="Arial"><b><br>Daniel Kidger</b></font><br><font size=1 face="Arial">IBM Technical Sales Specialist</font><br><font size=1 face="Arial">Spectrum Scale, Spectrum NAS and IBM Cloud
Object Store<br></font><font size=1 face="Arial"><br>+</font><font size=1 color=#5f5f5f face="Verdana">44-(0)7818 522 266 </font><font size=1 color=#5f5f5f face="Arial"><br>daniel.kidger@uk.ibm.com</font><font size=2 face="Arial"> </font><table width=264 style="border-collapse:collapse;"><tr height=8><td width=86 style="border-style:none none none none;border-color:#696969;border-width:0px 0px 0px 0px;padding:1px 1px;"><a href="https://www.youracclaim.com/badges/687cf790-fe65-4a92-b129-d23ae41862ac/public_url" target="_blank"></a><td width=86 style="border-style:none none none none;border-color:#696969;border-width:0px 0px 0px 0px;padding:1px 1px;"><a href="https://www.youracclaim.com/badges/8153c6a7-3e02-40be-87ee-24e27ae9459c/public_url" target="_blank"></a><td width=86 style="border-style:none none none none;border-color:#696969;border-width:0px 0px 0px 0px;padding:1px 1px;"><a href="https://www.youracclaim.com/badges/78197e2c-4277-4ec9-808b-ad6abe1e1b16/public_url" target="_blank"></a></table><br><font size=2 face="Arial"> </font><br><font size=1 face="Arial"> </font><br><font size=1 face="Arial"> </font><br><font size=1 face="Arial">----- Original message -----<br>From: "Alexander Wolf" <A.Wolf-Reber@de.ibm.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug-discuss@spectrumscale.org<br>Cc:<br>Subject: [EXTERNAL] Re: [gpfsug-discuss] Compression question<br>Date: Thu, Nov 28, 2019 12:21<br> </font><br><font size=2 face="Arial">I just tested this. Compressing a file did
free up space in the file system. Looks like our compression code does
not trigger COW on the snapshot. You can test this yourself by looking
into mmlssnapshot -d (please not on a large production fs, this command
is expensive).</font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">Mit freundlichen Grüßen / Kind regards</font><font size=2 face="Arial"></font><p><font size=2 face="Arial"> </font><p><font size=2 face="sans-serif"><Image.15749424191280.png></font><p><font size=2 face="Arial"> </font><p><table width=724 style="border-collapse:collapse;"><tr height=8><td width=229 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><font size=2 face="sans-serif"><Image.15749424191281.png></font><br><font size=2 face="sans-serif"> </font><td width=31 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><font size=3 face="sans-serif">
</font><td width=464 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><font size=3 face="Arial"><b>Dr.
Alexander Wolf-Reber</b></font><font size=1 face="Arial"><br>Spectrum Scale Release Lead Architect<br>Department M069 / Spectrum Scale Software Development<br><br>+49-160-90540880<br>a.wolf-reber@de.ibm.com</font></table><br><font size=2 face="sans-serif"><Image.15749424191282.png></font><br><a href="https://www.ibm.com/privacy/us/en/" target="_blank"><font size=2 color=blue face="Arial"><u>IBM
Data Privacy Statement</u></font></a><p><font size=1 color=#a2a2a2 face="Arial">IBM Deutschland Research &
Development GmbH / Vorsitzende des Aufsichtsrats: Matthias Hartmann / Geschäftsführung:
Dirk Wittkopp<br>Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart,
HRB 243294</font><p><font size=2 face="Arial"> </font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">----- Original message -----<br>From: "Luis Bolinches" <luis.bolinches@fi.ibm.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug-discuss@spectrumscale.org<br>Cc: gpfsug-discuss@spectrumscale.org<br>Subject: [EXTERNAL] Re: [gpfsug-discuss] Compression question<br>Date: Thu, Nov 28, 2019 11:47<br> </font><br><font size=2 face="Arial">Hi</font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">Same principle COW. The data blocks do not
get modified.</font><br><font size=2 color=#80803f face="Arial"><b>--<br>Ystävällisin terveisin / Kind regards / Saludos cordiales / Salutations
/ Salutacions<br>Luis Bolinches</b></font><br><font size=2 color=#80803f face="Arial"><b>Consultant IT Specialist<br>Mobile Phone: +358503112585</b></font><font size=2 color=blue face="Arial"><b><u><br></u></b></font><a href="https://www.youracclaim.com/user/luis-bolinches" target="_blank"><font size=2 color=blue face="Arial"><b><u>https://www.youracclaim.com/user/luis-bolinches</u></b></font></a><font size=2 color=#80803f face="Arial"><b><br><br>"If you always give you will always have" -- Anonymous</b></font><br><font size=1 face="Arial"> </font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial">----- Original message -----<br>From: "Cregan, Bob" <b.cregan@imperial.ac.uk><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>Cc:<br>Subject: [EXTERNAL] Re: [gpfsug-discuss] Compression question<br>Date: Thu, Nov 28, 2019 12:06 PM<br> </font><br><font size=3 face="Calibri">Just to clarify this is SS compression,
so </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">mmchattr --compression yes <filename></font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">or an ILM equivalent</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">So not a regular modification.</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">Bob</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=2 color=#0082bf face="Arial"><b>Bob Cregan</b></font><font size=2 face="Arial"><br>HPC Systems Analyst</font><br><font size=2 face="Arial">Information & Communication Technologies</font><br><font size=2 face="Arial">Imperial College London, <br>South Kensington Campus London, SW7 2AZ<br>T: 07712388129<br>E: b.cregan@imperial.ac.uk</font><br><font size=2 face="Arial">W: </font><a href="http://www.imperial.ac.uk/ict/rcs" target="_blank"><font size=2 color=blue face="Arial"><u>www.imperial.ac.uk/ict/rcs</u></font></a><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"><Image.f7e9a6a7-c4ab-4a2c-a979-4513774aa054.png></font><br><font size=3 face="Calibri"> </font><font size=2 face="Arial">@imperialRCS
@imperialRSE</font><font size=3 face="Calibri"> </font><p><font size=3 face="Calibri"> </font><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"><Image.dbd2fd87-b9f2-4b15-903f-c74c7b7298d3.png></font><p><font size=3 face="Calibri"> </font><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><p><font size=2 face="Arial"> </font><br><hr><br><font size=2 face="Calibri"><b>From:</b> Cregan, Bob<b><br>Sent:</b> 28 November 2019 09:43<b><br>To:</b> gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><b><br>Subject:</b> Compression question</font><font size=2 face="Arial"> </font><br><font size=2 face="Arial"> </font><br><font size=3 face="Calibri">Hi All,</font><br><font size=3 face="Calibri"> Can
someone answer the following question on compression in a snapshot context?
We have tried various experiments and they are inconclusive - too tedious
to go into the detail.</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">What happens to the snapshot when a file
is compressed in SS? The logic as I see it is </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">####### In a non compressed situation ###############</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">1) create a file,</font><br><font size=3 face="Calibri">2) create a snapshot.</font><br><font size=3 face="Calibri">3) modify a file in a normal way - the
blocks on disk are changed and the old blocks are then written to the snap.
</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">######In a compressed situation ############</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">1) create a file,</font><br><font size=3 face="Calibri">2) create a snapshot.</font><br><font size=3 face="Calibri">3) Compress the file. Now IBM says the
blocks are rewritten when the file is compressed. So do the old uncompressed
blocks go into the snap? If so we now have 2 copies of the file and unless
the compression > 50% we have used more space until the snap is
deleted.</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">You get the space back in the end, but
if you are in a tight situation then potentially compression might not
work for you in the short term.</font><br><font size=3 face="Calibri">Thanks</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri">Bob</font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=2 color=#0082bf face="Arial"><b>Bob Cregan</b></font><font size=2 face="Arial"><br>HPC Systems Analyst</font><br><font size=2 face="Arial">Information & Communication Technologies</font><br><font size=2 face="Arial">Imperial College London, <br>South Kensington Campus London, SW7 2AZ<br>T: 07712388129<br>E: b.cregan@imperial.ac.uk</font><br><font size=2 face="Arial">W: </font><a href="http://www.imperial.ac.uk/ict/rcs" target="_blank"><font size=2 color=blue face="Arial"><u>www.imperial.ac.uk/ict/rcs</u></font></a><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"><Image.ba38b5d6-12d6-476a-bcd8-7d647bfab5b3.png></font><br><font size=3 face="Calibri"> </font><font size=2 face="Arial">@imperialRCS
@imperialRSE</font><font size=3 face="Calibri"> </font><p><font size=3 face="Calibri"> </font><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"><Image.e34493c2-d35b-4fff-a6df-ce87e2ae5ed4.png></font><p><font size=3 face="Calibri"> </font><br><font size=3 color=#2f2f2f face="Times New Roman"> </font><p><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><br><font size=3 face="Calibri"> </font><p><tt><font size=2>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org</font></tt><tt><font size=2 color=blue><u><br></u></font></tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank"><tt><font size=2 color=blue><u>http://gpfsug.org/mailman/listinfo/gpfsug-discuss</u></font></tt></a><tt><font size=2></font></tt><br><font size=2 face="Arial"> </font><br><font size=2 face="Arial"><br>Ellei edellä ole toisin mainittu: / Unless stated otherwise above:<br>Oy IBM Finland Ab<br>PL 265, 00101 Helsinki, Finland<br>Business ID, Y-tunnus: 0195876-3<br>Registered in Finland<br> </font><br><tt><font size=2>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org</font></tt><tt><font size=2 color=blue><u><br></u></font></tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank"><tt><font size=2 color=blue><u>http://gpfsug.org/mailman/listinfo/gpfsug-discuss</u></font></tt></a><tt><font size=2></font></tt><br><font size=2 face="Arial"> </font><br><font size=1 face="Arial"> </font><br><tt><font size=2>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org</font></tt><tt><font size=2 color=blue><u><br></u></font></tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss" target="_blank"><tt><font size=2 color=blue><u>http://gpfsug.org/mailman/listinfo/gpfsug-discuss</u></font></tt></a><tt><font size=2></font></tt><br><font size=1 face="Arial"> </font><br><font size=2 face="Arial">Unless stated otherwise above:<br>IBM United Kingdom Limited - Registered in England and Wales with number
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