[plug] handling failed non-redundant storage in a server

[Craig Ringer]

On Thu, 2004-02-12 at 13:05, Brad Campbell wrote:

> These new Maxtor Maxline-II SATA drives are only detected as UDMA-33 under the stock kernel HPT366 
> driver (HPT374 card) and I can get at most about 15Mb/s to and from them.
> Using the Highpoint driver module compiled from source without the binary only raid module I can get 
> full speed to and from the drive. (About 20Mb/s sustained write and 50Mb/s read

A few quick tests with hdparm:

[root at bucket root]# hdparm -tT /dev/sdc
/dev/sdc:
 Timing buffer-cache reads:   128 MB in  0.26 seconds =492.31 MB/sec
 Timing buffered disk reads:  64 MB in  1.33 seconds = 48.12 MB/sec

[root at bucket root]# hdparm -tT /dev/sdc
/dev/sdc:
 Timing buffer-cache reads:   128 MB in  0.29 seconds =441.38 MB/sec
 Timing buffered disk reads:  64 MB in  1.33 seconds = 48.12 MB/sec

... seem to bear out that expectation. Those numbers are on a the 3ware
controller. If your disk is only giving you 15mb/s then something is
definitely quite wrong.

Craig Ringer