Public bug reported:
Binary package hint: mdadm
I use feisty
Reading from my raid1 is as fast as a single sata disc:
hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 172 MB in 3.00 seconds = 57.27 MB/sec
hdparm -t /dev/sdb1
/dev/sdb1:
Timing buffered disk reads: 172 MB in 3.01 seconds = 57.20 MB/sec
hdparm -t /dev/md0
/dev/md0:
Timing buffered disk reads: 172 MB in 3.00 seconds = 57.29 MB/sec
i tried
* different motherboard with a different sata onboard controller but
also the same results
* different ubuntu kernels: 2.6.17, 2.60.20 and from gutsy 2.6.22rc
* different images:
linux-image-2.6.20-16-generic 2.6.20-16.29
linux-image-2.6.20-16-lowlatency 2.6.20-16.29
linux-image-2.6.20-16-server 2.6.20-16.29
can anybody explain me why?
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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raid1 with sata is slow (speed of a single disc)
https://bugs.launchpad.net/bugs/120378
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