well, i´m thinking something like elevators, they have some files to configure options at /sys/block/sda/xxxx, it´s a nice interface... echo and cat to configure the elevator or sysctl... check this example of md in a old linux kernel (i don´t remember version maybe 2.6.18) #cd /sys/block/md0/md # ls -l -rw-r--r-- 1 root root 4096 Jul 5 23:39 array_state --w------- 1 root root 4096 Jul 5 23:39 bitmap_set_bits -rw-r--r-- 1 root root 4096 Jul 5 23:39 chunk_size -rw-r--r-- 1 root root 4096 Jul 5 23:39 component_size -r--r--r-- 1 root root 4096 Jul 5 23:39 degraded drwxr-xr-x 2 root root 0 Jul 5 23:39 dev-sda1 <<<<===== drwxr-xr-x 2 root root 0 Jul 5 23:39 dev-sdb1 <<<<===== -rw-r--r-- 1 root root 4096 Jul 5 23:39 layout -rw-r--r-- 1 root root 4096 Jul 5 23:39 level -rw-r--r-- 1 root root 4096 Jul 5 23:39 metadata_version -r--r--r-- 1 root root 4096 Jul 5 23:39 mismatch_cnt --w------- 1 root root 4096 Jul 5 23:39 new_dev -rw-r--r-- 1 root root 4096 Jul 5 23:39 raid_disks lrwxrwxrwx 1 root root 0 Jul 5 23:39 rd2 -> dev-sda1 lrwxrwxrwx 1 root root 0 Jul 5 23:39 rd3 -> dev-sdb1 -rw-r--r-- 1 root root 4096 Jul 5 23:39 reshape_position -rw-r--r-- 1 root root 4096 Jul 5 23:39 resync_start -rw-r--r-- 1 root root 4096 Jul 5 23:39 safe_mode_delay -rw-r--r-- 1 root root 4096 Jul 5 23:39 suspend_hi -rw-r--r-- 1 root root 4096 Jul 5 23:39 suspend_lo -rw-r--r-- 1 root root 4096 Jul 5 23:39 sync_action -r--r--r-- 1 root root 4096 Jul 5 23:39 sync_completed -rw-r--r-- 1 root root 4096 Jul 5 23:39 sync_force_parallel -rw-r--r-- 1 root root 4096 Jul 5 23:39 sync_max -r--r--r-- 1 root root 4096 Jul 5 23:39 sync_speed -rw-r--r-- 1 root root 4096 Jul 5 23:39 sync_speed_max -rw-r--r-- 1 root root 4096 Jul 5 23:39 sync_speed_min # ls dev-sda1/ -l total 0 lrwxrwxrwx 1 root root 0 Jul 5 23:40 block -> ../../../sda/sda1 -rw-r--r-- 1 root root 4096 Jul 5 23:40 errors -rw-r--r-- 1 root root 4096 Jul 5 23:40 offset -rw-r--r-- 1 root root 4096 Jul 5 23:40 size -rw-r--r-- 1 root root 4096 Jul 5 23:40 slot -rw-r--r-- 1 root root 4096 Jul 5 23:40 state --->>> maybe here we could put a file called: "raid1_read_balance_disk_speed" maybe we could save this information at md metadata? i don´t know how it works, just a idea, instead saving it at sysctl, use md metadata informations... -- 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
