raid1 have write-behind, raid10 use it? 2011/2/5 Roberto Spadim <roberto@xxxxxxxxxxxxx>: > 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 <keld@xxxxxxxxxx>: >> 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: >>> 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 >>> >>> >>> >>> -- >>> Roberto Spadim >>> Spadim Technology / SPAEmpresarial >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > > > -- > Roberto Spadim > Spadim Technology / SPAEmpresarial > -- Roberto Spadim Spadim Technology / SPAEmpresarial -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
