Re: raw devices in linux (O_DIRECT)
Hi Sandor:
Without the library libaio I got
08:32:46 libaio.so.1: cannot open shared object file: No such file ordirectory
08:32:46 Please install libaio package. See machine notes.
08:32:46 Warning: Kernel Asynchronous I/O is disabled.
After installing the library and leaving raw devices disabled in kernel
(default), IDS 10 uses KAIO.
[root@tina 0333]# cat /proc/sys/fs/aio-nr
32768
[root@tina ~]# onstat -g iov
IBM Informix Dynamic Server Version 10.00.UC1 -- On-Line -- Up 01:21:20 --1799820 Kbytes
AIO I/O vps:
class/vp s io/s totalops dskread dskwrite dskcopy wakeups io/wup errors
kio 0 i 0.0 119 119 0 0 275 0.4 0
kio 1 i 0.0 195 185 10 0 502 0.4 0
kio 2 i 0.0 40 23 17 0 170 0.2 0
msc 0 i 0.0 13 0 0 0 14 0.9 0
aio 0 i 0.0 161 16 8 0 161 1.0 0
aio 1 i 0.0 2 0 0 0 3 0.7 0
aio 2 i 0.0 0 0 0 0 1 0.0 0
pio 0 i 0.0 1 0 0 0 2 0.5 0
pio 1 i 0.0 0 0 0 0 1 0.0 0
lio 0 i 0.0 0 0 0 0 1 0.0 0
There is no more information on release notes but machine notes mention
the support of KAIO in kernel 2.6 but BOT the automagically activation.
Thanks
Sandor Szabo escribi':
> Hi Fernando,
>
> I have some information regarding the O_DIRECT flag.
>
> IDS V10 detects automatically that it runs on Linux Kernel 2.6 and if KAIO
> is enabled then it turns on the O_DIRECT flag!
>
> To enable KAIO:
>
> The libaio.so library is required, regardless of the distribution
> or kernel level. At the time of writing, IBM Informix Dynamic Server V10.0
> requires a minimum of libaio 0.3.96-3.
>
> Please also read the release notes for more information!
> bye
> Sandor
>
> IBM Informix Development Munich
> Information Management
> Hollerithstra'e 1
> 81829 Munich Germany
>
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