Le 29/03/10 18:48, Olivier Le Cam a ?crit : > Bonjour Aur?lien, > > Aurelien ROUGEMONT wrote: >> root at test4:/var/www# dd if=/dev/zero of=./test count=10000 bs=1024 >> 10000+0 records in >> 10000+0 records out >> 10240000 bytes (10 MB) copied, 17.8632 s, 573 kB/s > > I have posted the exact same results just a few days ago (using the > sid package backported to lenny): > http://gluster.org/pipermail/gluster-users/2010-March/004240.html > > BTW, this seems to be related to the block size. Performances might be > very different with different block sizes: > > gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=2000 > 10000+0 enregistrements lus > 10000+0 enregistrements ?crits > 20000000 bytes (20 MB) copied, 3,25723 s, 6,1 MB/s > > gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=10000 > 10000+0 enregistrements lus > 10000+0 enregistrements ?crits > 100000000 bytes (100 MB) copied, 3,30255 s, 30,3 MB/s > > gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=40000 > 10000+0 enregistrements lus > 10000+0 enregistrements ?crits > 400000000 bytes (400 MB) copied, 5,97635 s, 66,9 MB/s > > gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=80000 > 10000+0 enregistrements lus > 10000+0 enregistrements ?crits > 800000000 bytes (800 MB) copied, 9,12432 s, 87,7 MB/s > > gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=160000 > 10000+0 enregistrements lus > 10000+0 enregistrements ?crits > 1600000000 bytes (1,6 GB) copied, 15,0147 s, 107 MB/s > > gl2:/web-nunki# dd if=/dev/zero of=./test count=10000 bs=320000 > 10000+0 enregistrements lus > 10000+0 enregistrements ?crits > 3200000000 bytes (3,2 GB) copied, 28,8645 s, 111 MB/s > > TBH, I don't know what to conclude from these results. > > Regards, Bonsoir Olivier, I did not have the time to write a proper addendum to my earlier emails. I came to the very same conclusions. And I am now in front of some questions like : will this be ok for a web servers farm ? what dies it mean ? What is the most common bs= equivalent for a www server ? Do i have to change the block size of the underlying filesystem ? (by the way, i've managed to get the same results with an opensolaris 2009.06 + glusterfs 3.0.3) I would be glad to get some more explanations about this Thank you all for taking the time to answer to my wonderings. Best regards, Aur?lien !DSPAM:4bb12b3b212821458925448!
