Re: raid1 new read balance, first test, some doubt, can anyone help?

i saw, raid10 have layout that raid1 don't have
but for ssd i don't need layout, it don't have high access time
my test is just for read_balance function if it work there, should
work with raid10 too

2011/2/5 Keld Jørn Simonsen [off-list ref]:

Hi Roberto

Just a little advice:

IMHO raid1 is old technology, you should rather look at the raid10
driver, which can do the same as raid1, but also do some other stuff.

best regards
keld


On Sat, Feb 05, 2011 at 03:38:22AM -0200, Roberto Spadim wrote:

quoted

hi i make a read balance select (via sysfs), could anyone help me to debug it?
the new/old code is located at:
http://www.spadim.com.br/raid1/
it's kernel 2.6.37 based

=============================================
i don't know if exist a function at per mirror bio queue that return
the sum of write sectors, sum of read sectors, the first and last
sector position in queue
if anyone know please help me, i will use it at
line: 510 raid1.new.c
time_based_current_queue_time = 0;

all information is in the same line

=============================================
i don't know how to read information per mirror
for example, at raid1.h
i have some variables:
        int             head_distance_rate;     /* used by time based,
time=(this_sector - head_position) * head_distance_rate */
        int             read_sectors_rate;      /* used by time based,
time=sectors * read_sectors_rate */
        int             write_sectors_rate;        /* used by time
based, time=sectors * write_byte_rate   */

i would make it per mirror, for example:

/sys/block/md0/md/sda1_head_distance_rate -> head_distance_rate
/sys/block/md0/md/sda1_read_sectors_rate -> read_sectors_rate
/sys/block/md0/md/sda1_write_sectors_rate -> write_sectors_rate

anyone know how to do it?
how could i compile the raid1.c and raid1.h to test?
my today raid1 is a module at my current kernel, but i couldn't (i
don't know how) compile it and use :/ it's my first kernel driver :)
hehe



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Roberto Spadim
Spadim Technology / SPAEmpresarial
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Roberto Spadim
Spadim Technology / SPAEmpresarial
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