Hi. I'm a new Syno user, and new to the forums.
My rig is a 410j, populated with 4 of the Samsung Spinpoint HD204UI 2TB drives. Using the version of SynologyAssistant (2.3-1157) that came with the NAS, I tested and formatted the drives, and created a single 5.36 TB RAID 5 volume. The box is running under DSM 3.0-1354. I fired up the array a week ago, and have loaded ~1.9 TB of data onto it, all without incident.
I am, however, somewhat concerned about the performance of the unit. While trying to determine possible bottlenecks in the configuration, I became aware of the potential issues with 4K-sector drives (like the Spinpoints I have installed). In order to rule out bad sector alignment as a performance problem, can anybody verify that my drives are properly sector-aligned? I believe they are, but this is my first experience with this type of drive and I'd like another opinion.
This is the output from fdisk, edited to show only the partitioning on the first drive. All four drives are identically partitioned.
- Code: Select all
NAS> fdisk -lu
Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 256 4980735 2490240 fd Linux raid autodetect
Partition 1 does not end on cylinder boundary
/dev/sda2 4980736 9175039 2097152 fd Linux raid autodetect
Partition 2 does not end on cylinder boundary
/dev/sda3 9437184 3907024064 1948793440+ fd Linux raid autodetect
I believe the partitions are correctly sector-aligned because (a) the starting sector for each partition is divisible by 8, and (b) the size of each partition (in sectors) is divisible by 8. And, based on my research, 8 is the magic number, because 8 x 512 = 4K.
Can anyone verify that my drives are correctly sector-aligned? If you need any additional information, please let me know.
Thanks in advance.