[Beowulf] real hard drive failures
mwill at penguincomputing.com
Tue Jan 25 13:59:27 PST 2005
On Tuesday 25 January 2005 01:42 pm, Alvin Oga wrote:
> > I'm moving to a 3 drive raid5 setup on each node (drives are cheap, down time
> > is not) and considering changing to Seagate SATA drives anyone care to offer
> > opinions or more anecdotes? :-)
> == using 4 drive raid is better ... but is NOT the solution ==
> - configuring raid is NOT cheap ...
Depends on what controller you use. 3ware escalade can be scripted with tw_cli.
> - fixing raid is expensive time ... (due to mirroring and syncing)
Lower performance while reconstructing and degraded, but back to normal
after the replacing drive has been updated.
> - if downtime is important, and should be avoidable, than raid
> is the worst thing, since it's 4x slower to bring back up than
> a single disk failure
You are talking about double disk failure that brings down the raid5?
> - raid will NOT prevent your downtime, as that raid box
> will have to be shutdown sooner or later
> ( shutting down sooner ( asap ) prevents data loss )
Hot-swappable drive bays should be the standard nowadays, and do not
require shutdown of the server.
Michael Will, Linux Sales Engineer
Tel: 415-954-2822 Toll Free: 888-PENGUIN
Fax: 415-954-2899 www.penguincomputing.com
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