I am doing disk mirroring and this command I entered:

metainit d202 1 1 c0t1d0s0

gives me this error "metainit: d202: no such file or directory"

The nmd value in /kernel/drv/md.conf is set to 2000.

Any ideas what this error means?

Strange. Do you have other metadevices set up or is this the first? Have you done a reconfigure reboot since enabling the md driver?

you don't need to reboot to create metadevices... this is only for rootmirrors after enter "metaroot" command and change the vfstab entries (afaik).

do you have metadbs created? also please use "copy and paste" and code tags for your output. you might have a typo...

That error message is indicative that the device file entries have not been created in /dev/md/rdsk and /dev/md/dsk. The default value for nmd is 128, so you will only have devices d0 thru d127. Simply editing the /kernel/drv/md.conf file does not create these device files. You must run the devfsadm command or do a reconfiguration boot to create them. Also, per Sun's recommendation, you should only set nmd and md_nsets to values slightly higher than the number of volumes you plan to use for optimal performance.