More Apache stuckage

Wednesday, 01. 11. 2006  –  Category: all, sw

mod_status shows loads of children in Keepalive state with Seconds Since much higher than KeepAliveTimeout eventually the number of these reaches MaxClients, wedging the server hung process backtrace like this: (gdb)  bt #0  0x2814d118 in read () from /usr/lib/libc.so.4 #1  0x2830e69f in ssl_io_hook_read () from /usr/local/libexec/apache/libssl.so #2  0x806d256 in ap_hook_call_func () #3  0x806ce7b in ap_hook_call () #4  0x8051bea in ap_read () […]

Solaris fssnap and realtime processes

Wednesday, 12. 21. 2005  –  Category: all, vague

fsnap(1M) is most woo-esque for backing up filesystems, in a snapshot filesystem dump filesystem to tape release snapshot check dump kind of manner. It does, however, have problems with realtime priority processes. If the executable of such a process resides on the filesystem being snapshotted, things don’t work: snapshot error: File system could not be […]

Highly available filesytems

Thursday, 11. 24. 2005  –  Category: all, sw

A hosting project I’m working on needs a large filesystem to be available on multiple hosts and to be continually mirrored. A pair of NFS servers rsyncing master to slave – feeble Coda – looks good but project appears dead (though has current kernel support on both FreeBSD and Linux), 32bit limitation on metadata restricts […]

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