On Wed, May 15, 2013 at 01:16:20PM +0500, Muhammad Yousuf Khan wrote:
> i have baught a new HD with same size and capacity. and trying to copy
> partition via command "sfdisk -d /dev/sda | sfdisk --force /dev/sdb"
>
> above command work well. however one confusing part it "fdisk -l
> /dev/sdb" is giving some information which i am worried about.
>
> i think it souldnt give me this error as the harddrives are same specs and
> even vendor is same. can anyone kindly share why it is giving me this
> message. should i worried about the stability of my raid as it is going to
> be in production soon and i do not wanna loos my data.
>
> here is the detail .
> Disk /dev/sda: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x0004623a
>
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 1228 9862144 fd Linux raid
> autodetect
> /dev/sda2 1229 4268 24413185 5 Extended
> /dev/sda3 4268 60802 454108160 fd Linux raid
> autodetect
> /dev/sda5 1229 4268 24413184 fd Linux raid
> autodetect
>
> Disk /dev/sdb: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 4096 bytes
^^^^
Did you spot this? Although the disks are the same size, /dev/sdb is an
"Advanced Format" disk. If they are both the same manufacturer and
model, then your manufacturer has been sneaky.
As fdisk has noted, you will need to align your partitions to 4096 byte
boundaries rather than 512 byte boundaries for optimal I/O.
> I/O size (minimum/optimal): 4096 bytes / 4096 bytes
> Disk identifier: 0x0004623a
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 * 1 1228 9862144 fd Linux raid
> autodetect
> /dev/sdb2 1229 4268 24413185 5 Extended
> Partition 2 does not start on physical sector boundary.
> /dev/sdb3 4268 60802 454108160 fd Linux raid
> autodetect
> /dev/sdb5 1229 4268 24413184 fd Linux raid
> autodetect
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