Date: Sun, 12 Oct 2008 16:13:26 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-geom@freebsd.org Subject: Re: Problems with journal? Message-ID: <gct0m9$mcu$1@ger.gmane.org> In-Reply-To: <48F1C760.1080902@zirakzigil.org> References: <48DE439C.4050505@zirakzigil.org> <48F1C760.1080902@zirakzigil.org>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig944EA1D4A61F55876793181E Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Giulio Ferro wrote: > Giulio Ferro wrote: >> I'm experiencing very serious delay issues in 2 production servers. > [...] >> >> I hope any of you can help me look in the right direction, and point >> me to any further tests to try or tunable >> to set... >> >> Thanks in advance. >> >=20 > I didn't receive any answer to this, so I'm guessing ufs journal > is abandoned or there is no interest in supporting it in production > environment. > Anyway I removed it from my servers and reverted to standard UFS, > so the problems disappeared. I also tried zfs (the only other journale= d > filesystem available on freebsd). I didn't experiences the hanging beha= vior > I did with journaled ufs, but it's considerably slower than standard uf= s > (1/2 slower writes, 1/10 slower reads)... Both gjournal and ZFS are still "experimental" as far as stability and performance is concerned (actually, I have the feeling that gjournal itself is simple enough to be ok but it exposes timing problems with UFS...), but you might help by giving more information about your problem= : * send output from top (with "S" mode) and vmstat ("vmstat 1") when you experience your slowdown problem * create a kernel core dump (see http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kern= eldebug.html#KERNELDEBUG-OBTAIN and http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kern= eldebug-online-ddb.html , enter "call doadump" on the online debugger prompt) when your problem starts. * attach a debugger to the kernel dump, record and send output of "ps", "show pcpu", "show allpcpu", "show locks", "show alllocks", "show lockedvnods" and "alltrace." These are just generic tips, I don't have an idea what might cause your problems (so some of the information I requested might be useless, but better to send as much as possible; maybe someone will see something interesting). --------------enig944EA1D4A61F55876793181E Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkjyBgYACgkQldnAQVacBciHwgCdFV2YnrX1SQ7gcYcEenwID4gi 0OUAoJs/Lu/psDFfCkqeBxUDMp3kM7Mx =16uK -----END PGP SIGNATURE----- --------------enig944EA1D4A61F55876793181E--
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