On 04/04/2011 08:10, Lev Serebryakov wrote:
Hello, Alexander.I'm replacing old WD500AAKS HDDs in my (software) RAID5 with new WD20EARS, which are advanced format. And speed is terrible. RAID5 rebuilding shows about 8MiB/s (55MiB/s is typical speed for old AAKSes)... I'm affraid, that my HDD is in some strange mode with 512 byte sectors emulation:
With such drives, everything must be 4 KiB-aligned : the RAID stripes, the partitions / slices and the file system / block size. This is the only way to get good performance.
If you just replace a non-4K drive in a RAID5 with a 4K drive, it is very likely that there would be alignment problems with that drive.
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