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I'm currently rebuilding my fileserver, but because of SATA port limitations, I can only use 5 disks at a time. I've remove a drive from my original RAID, so I've been able to create a new degraded RAID5 array.
I now have 2x 3x2To (-1 missing) degraded RAID5 arrays. New disk are WS Nas drives (4k optimized).
I've followed this guide in order to be 4k compliant:
...unless I'm not using LVM.
Write test for original degraded array (dd if=/dev/zero of=/mnt/data/out bs=1M count=10240):
90mb/s
New degraded array:
120mb/s
Unless this is slightly better numbers, I'm wondering how degraded state affect performance? The author from the guide measures 236mb/s with the same test (but not degraded array).
Before copying all my data, and switch back to a fully operational array, I'm wondering if 120mb/s could be a normal writing performance in my case?
Barium Scoorge
Posted 2013-09-08T12:51:42.390
Reputation: 131
Using external SATA connector, I've added another 2To drive to replace missing RAID5 drive. Writing performance is still @ 120mb/s. – Barium Scoorge – 2013-09-09T17:13:30.520