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Hi Patrick, I did the test. I wrote 1TB file then deleted it and
after deleting slowly the counter started to show free available
blocks.<br>
So looks like the space is showing up as free.<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812911018000 62518175884 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812911018000 62518173088 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539145880 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146556 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539148240 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146832 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539148020 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146292 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146292 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539145864 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146900 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146040 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539147180 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539144304 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539148240 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539148240 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539148240 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539148240 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146528 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146528 93%
/reg/data/ana01<br>
<br>
Filesystem 1K-blocks Used Available Use%
Mounted on<br>
172.21.49.73@tcp:/ana01 921531373380 812890046512 62539146716 93%
/reg/data/ana01<br>
<br>
<br>
On 5/6/17 7:36 PM, Patrick Farrell wrote:<br>
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Riccardo,<br>
<br>
You may be unable to free space on the OSTs when deleting
files. I can't remember if 2.4 has the required support for
delete-from-MDS (not the real feature name, sorry). I think it
does, but I'm not sure. It's easy to check - just delete a
large file and see if the space shows up as free.<br>
<br>
Other than that, your main concern is that no one has tested
this or fixed any bugs that came up. I'm not aware of anything
that should be broken, again except possibly for that thing with
delete I mentioned, and obviously, lots of client features will
not work. But they should be disabled automatically because the
server doesn't support them.<br>
<br>
So you might be OK, but there's a very real chance those clients
may crash the servers or the other way around, as the
combination is not supported and has not been tested.<br>
<br>
I strongly suggest you upgrade your servers! There are lots of
handy new features, and you would avoid this problem entirely.<br>
<br>
- Patrick<br>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
lustre-discuss
<a class="moz-txt-link-rfc2396E" href="mailto:lustre-discuss-bounces@lists.lustre.org"><lustre-discuss-bounces@lists.lustre.org></a> on behalf of
Riccardo Veraldi <a class="moz-txt-link-rfc2396E" href="mailto:Riccardo.Veraldi@cnaf.infn.it"><Riccardo.Veraldi@cnaf.infn.it></a><br>
<b>Sent:</b> Saturday, May 6, 2017 5:25:40 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a><br>
<b>Subject:</b> [lustre-discuss] client complains about
server version</font>
<div></div>
</div>
</div>
<font size="2"><span style="font-size:10pt;">
<div class="PlainText">Hello,<br>
<br>
I moved many of my lustre clients to 2.9.0. Anyway the
server version is<br>
pretty old (2.4)<br>
<br>
Do I have to worry ?<br>
<br>
Things seems working though<br>
<br>
May 4 14:37:48 psana1620 kernel: [ 43.145108] Lustre:
Server MGS<br>
version (2.4.1.0) is much older than client. Consider
upgrading server<br>
(2.9.0)<br>
<br>
<br>
thank you<br>
<br>
Ricl<br>
<br>
<br>
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