Subject: Re: iostat "md#" disks
To: Erik E. Fair <fair@clock.org>
From: Jason Thorpe <thorpej@nas.nasa.gov>
List: port-sun3
Date: 10/29/1997 19:37:31
On Wed, 29 Oct 1997 14:54:56 -0800 
 "Erik E. Fair" (Time Keeper) <fair@clock.org> wrote:

 >       tty            sd0             md0             md1             cpu
 >  tin tout  KB/t t/s MB/s   KB/t t/s MB/s   KB/t t/s MB/s  us ni sy in id
 >    1  213  7.14   3 0.02   0.00   0 0.00   0.00   0 0.00   7  9 14  0 69
 > 
 > Filesystem    1K-blocks     Used    Avail Capacity  Mounted on
 > /dev/sd0a         22303    11605     9582    55%    /
 > mfs:20             7911        4     7511     0%    /tmp
 > procfs                8        8        0   100%    /proc
 > kernfs                1        1        0   100%    /kern
 > /dev/sd0d        178543     4162   165453     2%    /var
 > /dev/sd0f        178543    14991   154624     9%    /var/tmp
 > /dev/sd0e        178543   135085    34530    80%    /usr
 > /dev/sd0g        535279        1   508514     0%    /altroot
 > /dev/sd0h        535663   344017   164862    68%    /usr/src
 > 
 > Are those "md0" and "md1" disks the memory file system? If so, why are they
 > apparently not instrumented?

No, the "mfs" is different from the "memory disks".  The latter can hold
any file system; they're just a disk.

I don't know if the "md" driver has the requisite disk_busy()/disk_unbusy()
calls to instrument it.

Jason R. Thorpe                                       thorpej@nas.nasa.gov
NASA Ames Research Center                            Home: +1 408 866 1912
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