Re: standard performance (write speed 20Mb/s)

2011/7/21 Erwan Leroux [off-list ref]:

following is how i configured advanced format drives for raid 5
i created one partition on each disk

fdisk -u /dev/sdX
# -u change the unit displayed by fdisk to sector instead of
cylinders, this way it's easier to configure

# the table partition isn't really modifier until you send the w
command, so if you messed up use the q to quit and restart

#delete first partition of the disk, repeat until you had cleared the disk
d

# create a new partition
n

# select primary parition
p

#select number one (don't know if number is important, i guess it's
means /dev/sdX1)
1

#select first sector, here is the catch, to properly align the disk, select 64
64

Why do you choose 64? One physical sector (4KiB) is 8 logical sectors
(512 B). Would any number greater or equal to 8 and evenly divisible
by 8 work as well? Are you aiming to align partition start with RAID
chunk boundaries?

Just curious.

Paweł
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html