Re: migrating from single disk to RAID 5

Well, I've upgraded to kernel 2.4.16, which seems to have helped. I
have compiled postgres 7.1.3 with debugging on (level 4) but I still
have one "larger" query (32G of temporary sort space, 3 hours of cpu on
an Athlon 800 w/1.5G ram) that crashes the backend with "status code
139". Any idea where I could find out what status code 139 is?

also, FWIW, here is a backtrace.

Thanks,

-paul

GNU gdb 5.0mdk-11mdk Linux-Mandrake 8.0
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This GDB was configured as "i386-mandrake-linux"...
Core was generated by `postgres: web bcn [local] SELECT '.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libcrypt.so.1...done.
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Loaded symbols for /lib/libc.so.6
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#0 0x08066493 in nocachegetattr ()
#0 0x08066493 in nocachegetattr ()
#1 0x081498a4 in comparetup_heap ()
#2 0x081495ca in tuplesort_heap_insert ()
#3 0x081490ce in beginmerge ()
#4 0x08148ecb in mergeonerun ()
#5 0x08148dab in mergeruns ()
#6 0x081487a5 in tuplesort_performsort ()
#7 0x080c52d0 in ExecSort ()
#8 0x080bd809 in ExecProcNode ()
#9 0x080c3a9f in ExecMergeJoin ()
#10 0x080bd7c0 in ExecProcNode ()
#11 0x080c4547 in ExecNestLoop ()
#12 0x080bd7af in ExecProcNode ()
#13 0x080c4547 in ExecNestLoop ()
#14 0x080bd7af in ExecProcNode ()
#15 0x080c4547 in ExecNestLoop ()
#16 0x080bd7af in ExecProcNode ()
#17 0x080c52b9 in ExecSort ()
#18 0x080bd809 in ExecProcNode ()
#19 0x080c5543 in ExecUnique ()
#20 0x080bd819 in ExecProcNode ()
#21 0x080bc6a6 in ExecutePlan ()
#22 0x080bbd75 in ExecutorRun ()
#23 0x08104d81 in ProcessQuery ()
#24 0x08103779 in pg_exec_query_string ()
#25 0x0810480b in PostgresMain ()
#26 0x080ee514 in DoBackend ()
#27 0x080ee0f5 in BackendStartup ()
#28 0x080ed2c9 in ServerLoop ()
#29 0x080eccd6 in PostmasterMain ()
#30 0x080cc94f in main ()
#31 0x401280de in __libc_start_main () from /lib/libc.so.6

Paul Wehr wrote:

> I've moved our database from a single 30G drive with reiserfs (3.6.25
> on kernel 2.4.9) to a 4-drive RAID 5 of 80G disks with reiserfs on
> that (yeilding 167G). The performance is fantastic, but the backend
> server is periodically crashing.
>
> With almost no information whatsoever, anyone care to speculate on if
> this is:
> 1) hardware problem (seems unlikely since the drives are < 1 year old)
> 2) reiserfs or kernel bug
> 3) problem with a) shutting down postgres, b) cp -arv /olddata
> /newdata, c) edit /etc/rc.d, d) start postgres
> 4) something else entirely
>
> also, if it's 1), is there something better to use to check the array
> than "badblocks /dev/md0"?
>
> Not much to go on, I know, but obviously we are in big trouble if the
> database is "randomly" crashing (it seems to work fine maybe 90% of
> the time), and I'm worried about data corruption..
>
> TIA
>
> -paul
>
>
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