Dear all,
I am witring because I am desesparate with the transfer rate I get with
my Raid configuration using a qlogic 2gb qla2300 fiber channel under
linux.
Here is my configuration :
- Pc Workstation chipset Intel I860, Bi-pro Xeon 1,5 GHz, 1 GB RDRam,
linux Red-Hat 7.1 Kernel 2.4.2.
- Qlogic qla2300 plugged in 66Mh/64 bits slot with one fiber channel 2
gbits link to a jbod bench of 6 disks U160 15k rpm.
I use LVM to stripe the 6 disks in raid0 , and I use ext2 as file
system.
The average tranfer data rate I gained with this configuration is 85
MBytes in READing block of 2 Mbytes.
The JBOD raid disk manufacturer announces 194 MBytes with the same
configuration under Windows using iometer.
What's wrong with my configuration ???? I think the problem is not LVM
neither ext2.
Is there a way under linux to improve access to a bench of disks ?
If I understand well the operating system, it makes an intermediary copy
in a cache memory before to copy it in the user RAM. The result is a
double copy of buffer therefore the data rate divided by 2 . Is there a
mean to bypass this double copy ??
Any insights will be appreciated.
B.
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