SUMMARY@Online:DiskSuite, mirroring blows up

From: Chris Keane (chris@rufus.state.COM.AU)
Date: Fri Jun 11 1993 - 15:16:11 CDT

To: SUMMARY@Online:DiskSuite, mirroring, blows, up

On Wednesday night, I wrote:
> Hi all. I tried to install Online: DiskSuite mirroring onto an ELC running
> 4.1.1 tonight. Everything went fine right up until the end - the metadevices
> were initialised, they started re-syncing, finished re-syncing and then
> the load average on the machine went KA-POW up to 20 and stayed there.
> When I finally managed to get on and have a look (at nice -20), most the
> processes on the machine (such as all the nfsd's and other assorted goodies)
> were in an R state.
> I ran trace on one of these processes and it was performing read()s very,
> very slowly (like 10 seconds between each one), where it normally should
> have been zipping along.
> I could access all the mirrored partitions from my shell without much delay.

Well, I haven't has a chance to try any of the suggestions yet, but I thought
I'd better summarise, since I'm about to embark on 2 weeks leave.

The most likely solution is proposed by Glenn Satchell (
who reminded me that 4.1.1 needs the >1GB patch installed, which I haven't
done on the new DiskSuite kernel. In fact, I think I'll just upgrade to
4.1.3, a version I have several other ODS installations swimming along on.

Several other people suggested various methods of metattaching disks in
varying orders to ensure that ODS knows which disk has the original data on,
however I'm using my Tried&True(tm) method of attaching, and all the metasyncs
worked fine :-)

Thanks to all the following DiskSuiteHeads: (Brian Katzung) (Birger A. Wathne) (Glenn Satchell - Uniq Professional Services) (Charles D. Horn) (Tony Schmitz -- REACH Networks - New York)

Chris Keane. State Bank NSW ph. +61 2 259 4459
Unix Systems Manager (Group Treasury) chris@rufus.state.COM.AU
  Remember, if some weirdo in a blue suit offers you some DOS, just say no.

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