Re: Re: slow mdadm reshape, normal?

[Michael Ole Olsen <gnu@gmx.net>]

the slow disks (them with 85MB/s) in the posting are the one on the pci 4x sata controller

the 32bit pci sata (sata_sil) controller has 3 disks connected

the onboard sata2 6x sata connectors have 6 disks connected 
(p5n32-e sli motherboard), i believe all these are sata2 and not shared with
an ide controller.

so only the pci controller should have bus limitations, but i wonder why it is
that slow on reshape compared to build.

unfortunately I have not gotten the recent postings on the mailinglist since
28th last month perhaps my subscription got cleared so I didn't see any
reshape postings, just signed up on new.

here you can see the 3 slow disks pci32bit compared to onboard sata2 (sdb):

sda
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 2,46597 s, 85,0 MB/s
sdb
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 1,66641 s, 126 MB/s
sdc
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 2,51205 s, 83,5 MB/s
sdd
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 2,33702 s, 89,7 MB/s

are there any good tools you can recommend to test bus congestion as the
probable cause of this slowness?

/Michael