Date: Sun, 30 Sep 2012 13:07:36 -0700 From: Xin Li <delphij@delphij.net> To: Jin Guojun <jguojun@sbcglobal.net> Cc: hackers@freebsd.org, questions@freebsd.org Subject: Re: system hangs during dump + compress > usb2-drive Message-ID: <5068A688.4070100@delphij.net> In-Reply-To: <1348984196.37002.YahooMailRC@web180906.mail.ne1.yahoo.com> References: <1348984196.37002.YahooMailRC@web180906.mail.ne1.yahoo.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 9/29/12 10:49 PM, Jin Guojun wrote: > In FreeBSD 8.3 release (possibly in earlier release), dump a file > system has 2-3GB or more content can cause system hang in a > specific case (pipe to compression): > > dump FS-on-SATA-drive > usb-drive OK dump FS-on-SATA-drive > | anyCompress > sata-drive OK mv a-large-dump-file from > STAT drive to a USB drive OK dump small-FS-on-SATA-drive | > anyCompress > usb-drive OK small -- 1.8GB or less dump > large-FS-on-SATA-drive | anyCompress > usb-drive hang > content is 3GB or larger (did not try around 2GB yet) > > When system hangs, no sub system, such video, network, etc, will > function. Typically, the unfinished compressed dump file is around > 1.5-2.7GB, so guessing dumped file content is close to or over 2GB > when failure occurred. > > Has anyone encountered the same problem? > > Because this usually takes a few hours to occur, this is hard to > watch how/when it happens. Is any way to debug or determine what > status the system is? For starters I'd use a different console for doing procstat -kk -a and see what the system is doing. (Perhaps also top) I *think* that if it's just hanging for some time, it's probably because the system is trying to take a snapshot? It takes time on UFS when creating and removing the snapshot. Just a guess... Cheers, -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) iQEcBAEBCAAGBQJQaKaIAAoJEG80Jeu8UPuzfH4IAL3k2M/KHV39FrI0U4lZ1yu/ bFbJJubQHzjfNbDrI4er1Xg6S0sN0DNnRoD/bQFKKHvQpfqcCUOwUtpq0kssyfLY 4XQOF9nhcyvL/INz6ArtI7EhKh/2cADb+1zp+NMsFyqvn3F09VPvx6h9z6ufaian LlAA6uisZSl/eGv5uNGGcudiUxSALql8UniZVHJvyO+pCjOAwL+MBxfqQ4LW3DEy ngvkvCeQ2nK/k0oQDq5jt9A9+D+7b3+Wo+4sMkIN7uTMgPpET4JSgWgxkzG1xM+l VMTAUHiqdeKp2JbWot1sRE5K7SiLPDmVGXEa0w+duBbvtuk8M/uXLootky0y1Oc= =zTBM -----END PGP SIGNATURE-----
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