Date   : Fri, 07 Sep 1984 11:22:00 MDT (Fri)
From   : "Frank J. Wancho" <WANCHO@Simtel20.ARPA>
Subject: Problems with MICRO:

The RP06 disk pack which you know as our MICRO: structure apparently
had developed one or more bad spots over the year it has been in
service, and was finally detected sometime last week.  Such latent
errors are not handled well by the system, with one error generating
others and eventually giving the appearance of a degenerating system,
masking the original error, and eventually crashing the system.

The problem was correctly diagnosed yesterday afternoon, and a fresh
disk pack was brought online, initialized, and the MICRO: filesystem
was restored from Friday's full backup and Wednesday night's
incremental backup tapes.  The integrity of the structure was
thoroughly checked and a new backup run was then made and ran to
completion without errors.

In the process, I created the structure with no swapping pages
reserved for system use.  Thus, we have recovered about 7,000
additional disk pages available for still more files to be stored.  We
now have plenty of room for the 16 new SIG/M disks arrived in the
interim.  They will be uploaded next week.  Watch for an announcement.

Those of you who may have experienced difficulty with FTPing files
from MICRO: between last Thursday and yesterday, please try again.  If
you have any problems, let me know.

--Frank