Hi Sanjeev, Thank you! I was not able to find anything as useful on the subject as that! We are running build 54 on an X4500, would I be correct in my reading of that article that if I put "set zfs:zfs_arc_max = 0x100000000 #4GB" in my /etc/system, ZFS will consume no more than 4GB? Thank you in advance.
Best Regards, Jason On 1/8/07, Sanjeev Bagewadi <[EMAIL PROTECTED]> wrote:
Jason, Jason J. W. Williams wrote: > Thank you very much! I'm not very familiar with using mdb. Is there > anything to be aware of besides no active zpools? you can do the following as root user : -- snip -- # mdb -kw > arc::print -a "struct arc" c_max ffffffffc009a538 c_max = 0x2f9aa800 > ffffffffc009a538/W 0x20000000 arc+0x48: 0x2f9aa800 = 0x20000000 > -- snip -- Here I have modified the value of c_max from 0x2f9aa800 to 0x20000000. > > Also, which takes precedence 3/4 of the memory or 1GB? Thank you in > advance! Your help is greatly appreciated. Whichever is higher. Look at the routine arc_init() [Line 2544] at : http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/arc.c And I think your request has been answered :-) Looking at the source I see that they have introduced two new variables zfs_arc_max and zfs_arc_min which seem to be tunables ! There is a detailed explaination at : http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6505658 Thanks and regards, Sanjeev. > > Best Regards, > Jason > > On 1/7/07, Sanjeev Bagewadi <[EMAIL PROTECTED]> wrote: > >> Jason, >> >> There is no documented way of limiting the memory consumption. >> The ARC section of ZFS tries to adapt to the memory pressure of the >> system. >> However, in your case probably it is not quick enough I guess. >> >> One way of limiting the memory consumption would be limit the arc.c_max >> This (arc.c_max) is set to 3/4 of the memory available (or 1GB less than >> memory available). >> This is done when the ZFS is loaded (arc_init()). >> >> You should be able to change the value of arc.c_max through mdb and set >> it to the value >> you want. Exercise caution while setting it. Make sure you don't have >> active zpools during this operation. >> >> Thanks and regards, >> Sanjeev. >> >> Jason J. W. Williams wrote: >> >> > Hello, >> > >> > Is there a way to set a max memory utilization for ZFS? We're trying >> > to debug an issue where the ZFS is sucking all the RAM out of the box, >> > and its crashing MySQL as a result we think. Will ZFS reduce its cache >> > size if it feels memory pressure? Any help is greatly appreciated. >> > >> > Best Regards, >> > Jason >> > _______________________________________________ >> > zfs-discuss mailing list >> > zfs-discuss@opensolaris.org >> > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >> >> >> >> -- >> Solaris Revenue Products Engineering, >> India Engineering Center, >> Sun Microsystems India Pvt Ltd. >> Tel: x27521 +91 80 669 27521 >> >> > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss -- Solaris Revenue Products Engineering, India Engineering Center, Sun Microsystems India Pvt Ltd. Tel: x27521 +91 80 669 27521
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