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Doing it in fstab is more permanent, where if you use chattr, is it
easier to undo it. Editing fstab is always a pain. :) <br>
<br>
Just my .02<br>
<br>
David M.<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Arthur wrote:<br>
</div>
<blockquote
cite="mid:CA+r_57kBFFjosVcvF2-Vs00tr2259FpqS5ynmvNFD7fU8i9tqw@mail.gmail.com"
type="cite">
<div dir="ltr">Is "<span
style="font-family:arial,sans-serif;font-size:13px">chattr"
really needed for ext2? I normally just use "noatime" as a
mount option in my fstab.</span>
<div><span style="font-family:arial,sans-serif;font-size:13px"><br>
</span></div>
<div><font face="arial, sans-serif">Side Rant:</font></div>
<div><font face="arial, sans-serif"><br>
</font></div>
<div><font face="arial, sans-serif">While I love
btrfs, apparently you can't mount a subvolume as read only
"/", and then mount other subvolumes as read/write for
things like "/var".</font></div>
<div><font face="arial, sans-serif">I've actually found a use
case where my choice of filesystem leaves me less secure :(</font></div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Mon, Dec 16, 2013 at 8:26 PM,
Stephan Henning <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:shenning@gmail.com" target="_blank">shenning@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">-WD
<div><br>
</div>
<div>Ya, I'm going to recommend we look into this and see
if other options give us some improvement</div>
<div><br>
</div>
<div><br>
</div>
<div>-David</div>
<div><br>
</div>
<div>The current benchmark run takes about 10 days to
fully solve, which is about on par with our
longest/largest 'production' problem. </div>
<div><br>
</div>
<div>The machines are on a UPS, but it is more for power
conditioning than uptime. With three of these machines
in the rack running all out, the largest rackmount units
are only good for a few minutes. However, the program
does 'checkpoint' itself at certain intervals, so we
will loose some data with a power loss, but usually no
more than a few hours worth on these really long
solves. </div>
</div>
<div class="HOEnZb">
<div class="h5">
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Mon, Dec 16, 2013 at 6:28
PM, David <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:ainut@knology.net" target="_blank">ainut@knology.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
I had completely forgotten about the overhead of
atime and did not know the practicality of
noatime. Good catch, Charles.<br>
<br>
So I recommend that you use a filesystem on the
ssd's that does not use journaling, and set the
ssd drive directories with (as root) :<br>
<br>
format the SSD's with ext2 (fat32 is not
recommended for high speed usage but may not
matter with ssd's and only two files);<br>
<br>
then,<br>
<br>
[root@machine /root]#*chattr* -R +A
/dirofSSDtempdata/<br>
(after reformat, of course.)<br>
<br>
<br>
Caveat: without journaling, ensure you have a good
battery backup APS on the system. You probably
already have that for something that runs for
WEEKS!<br>
<br>
Also, I hope whoever wrote the program made it
re=entrant with little loss of time in case the
system did crash, for whatever reason.<br>
<br>
<br>
David M.<br>
<br>
<br>
<br>
Charles Moye wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
and set noatime?
<div><br>
<br>
<br>
On Mon, Dec 16, 2013 at 9:45 AM, David <<a
moz-do-not-send="true"
href="mailto:ainut@knology.net"
target="_blank">ainut@knology.net</a>
<mailto:<a moz-do-not-send="true"
href="mailto:ainut@knology.net"
target="_blank">ainut@knology.net</a>>>
wrote:<br>
<br>
Can't remember if ext4 uses journaling but
if it does, you'll get<br>
better times if you can turn it off.<br>
<br>
<br>
<br>
Stephan Henning wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div>
Wow, nice.<br>
<br>
-WD, I've gone in and checked, and at
least on the SSD array,<br>
it's ext4.<br>
<br>
<br>
On Mon, Dec 16, 2013 at 7:01 AM, Matt
<<a moz-do-not-send="true"
href="mailto:brimstone@the.narro.ws"
target="_blank">brimstone@the.narro.ws</a><br>
</div>
<div>
<mailto:<a moz-do-not-send="true"
href="mailto:brimstone@the.narro.ws"
target="_blank">brimstone@the.narro.ws</a>>>
wrote:<br>
<br>
On 12/15/2013 10:37 PM, Arthur
wrote:<br>
> What did mailman do?<br>
<br>
Arthur,<br>
<br>
Mailman's default setting for
digests is to send them out<br>
every 30KB.<br>
People don't trim messages like the
bad old days; Ethan's<br>
response email<br>
after yours is 35KB alone. I upped
the setting to 10MB, which<br>
is Gmail's<br>
inbound limit if I recall correctly.<br>
<br>
#matt<br>
<br>
<br>
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-- <br>
Sincerely,<br>
Arthur Moore<br>
(256) 277-1001<br>
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