Re: AIX/ORACLE - Raid devices + async I/O

From: Hamish Marson <hamish_at_thebes.waikato.ac.nz>
Date: 28 Oct 1994 09:02:47 GMT
Message-ID: <38qenn$1lor_at_thebes.waikato.ac.nz>

Anton Dischner (dischner_at_med.uni-muenchen.de) wrote:
> > > In 4.1.1 max filesystem size is up to 64 GByte (using NBPI ratio 4096)
> > ^^^^
> > At the risk of sounding dumb...
> >
> > Whats NBPI ratio?
> >
> >
 

> No it's not dump. (To be precise: I dont know it).

I can now anser that. I got my copy of 4.1 today, and is the ratio of inodes to disk. ie 4096=1 inode/4096 byes. 512=1inode for every 512 byte block. I'm running with 1024 and 512byte blocks at the moment on a test news spool, + LZ compression. looking good so far, some groups actually take up less space on disk than actual data (I didn't think it would be that mich difference. Heres some figures for the first few groups n my spool...

alt.1d                  :   203 arts   287828 Bytes   258560 Disk 
alt.2600                :   479 arts   932270 Bytes   810496 Disk
alt.2600.hope.announce  :     1 arts      613 Bytes     1024 Disk
alt.2600.hope.d         :     6 arts     9834 Bytes     8704 Disk
alt.2600.hope.tech      :     2 arts      953 Bytes     1024 Disk
alt.2600hz              :     6 arts    23326 Bytes    15360 Disk
alt.266                 :     0 arts        0 Bytes        0 Disk
alt.3d                  :   140 arts   208473 Bytes   183808 Disk
alt.abortion.inequity   :   356 arts  1132482 Bytes   852480 Disk
alt.abuse-recovery      :     0 arts        0 Bytes        0 Disk

alt.abuse.transcendence : 52 arts 163188 Bytes 126464 Disk

PS. Performance is quite good also. On an R24 the Kernel (jfsc) process (Which I assume is the backgrouund compression/decompression engine) uses on average < 1% CPU while I am tarring and untarring from the original spool area via NFS.

--
======================================================================
|  Hamish Marson                                                     |
|  Systems Programmer              |                                 |
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Received on Fri Oct 28 1994 - 10:02:47 CET