Hello!
People are talking about performance at about 20MB/s using UDMA, but
mine SCSI's are so slow!
* box one: Linux 2.0.35 (have been running for about 10 months):
128MB RAM, Pentium 233
Adaptec 2940WU
software RAID5=3 x ST3455N (7200rpm, Ultra-SCSI)+ 1 IBM DCAS-34330W
(5400rpm, wide), 16k chunk size
2940WU also connects 1 HP C1533A and 1 EXABYTE EXB-8505 tape drives, in
addition to the 4 Disks.
bonnie says:
-------Sequential Output-------- ---Sequential Input--
--Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block---
--Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
/sec %CPU
100 5610 46.4 6703 13.4 2594 11.7 7012 47.1 8485 14.4
150.9 4.0
sync;date;if=/dev/md0 of=/dev/zero bs=1024k count=1024;date
gives 7.5MB/s
sync;date;if=/dev/zero of=/tmp/1gb bs=1024k count=1024;date
gives 4.9MB/s
* box two: SCO OpenServer (can't replace it with Linux because we have
Informix 4GL running):
96MB RAM, Penium 200MMX
AcceleRAID 150
hardware RAID5=4 x Quantum Atlas 10K (10000rpm)
sync;date;if=/dev/p2d4 of=/dev/null bs=1024k count=1024;date
gives 15MB/s
sync;date;if=/dev/zero of=/tmp/1gb bs=1024k count=1024;date
gives 5.8MB/s
2 x 256MB ECC& registered SDRAM and 1 Pentium III 450 will soon replace
this testing machine for SCO as a production DBMS server.
AcreAltos Pro 960S (Pentium Pro 200) has been serving as our production
DBMS server for 2+ years. Users are complaining its slow response when
selecting big tables. So I am testing Mylex 150 on SCO and found that
its performance is so low compared to other people's Linux software
RAID's.
I don't much mind the low performance of Linux as its load is light, but
I will be a dead man if the new hardware for SCO does not work much
faster than the current production hardware.
I am afraid that I have made a wrong decision using Mylex 150. Or,
hopefully someone can teach me tuning Mylex 150 and thus much improve
its performance, if I am lucky enough.
Regards,
CN
