Lockout during heavy disk I/O

Jeanette Pauline Middelink (middelin@polyware.nl)
Sun, 15 Nov 1998 23:34:21 +0100


LS,

Last night I was was installing a new server disk on a shadow
machine, and was filling it from the main server over ethernet
with an "ssh ... tar cvfz - | tar xvfz -". I know this is not
the most efficient way, but since gzip does CRC checking, i
was happy with it...

Hoverever, not the problem. During the time tar was accessing
the disk, (very fast I might add) the whole machine became
unusable for other process. The other ssh's I had open on
that machine became silent, and dropped off after a while
and to top even that, the leased line dropped too because
of the pppd daemon who was unable to reply to the LLCP?
retries...

When the transfer of the 1.2GB was completed all things
went back to normal...

Both machines are running 128, the source is a UP, the
mirror an SMP machine.

So... IMHO the changes in the ll_blk_rw kind of backfired here... :(

Met vriendelijke groet,
Pauline Middelink

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