[j-nsp] Re: High failure rates for M7i/M10i hard disks?

Daniel Roesen dr at cluenet.de
Fri Aug 26 17:58:00 EDT 2005

On Fri, Aug 26, 2005 at 05:05:05PM -0400, Richard A Steenbergen wrote:
> I checked on the specific drive used in a RE-5.0/RE-400, based on 
> information provided by some actual users of it. The drive detects as a:
> ad1: 19077MB <HTS548020M9AT00> [38760/16/63] at ata0-slave using UDMA33
> Which seems to be a Travelstr 5K80-20 5400RPM 20G ATA-6 drive:
> http://www.hitachigst.com/portal/site/en/menuitem.4a8443e5524e0c5deb4703e3aac4f0a0/


Service life of the drive is approximately 5 years or 20,000 power on
hours, which comes first, under the following

* Less than 333 power on hours per month.
* Seeking/Writing/Reading operation is less than 20% of power on hours.

Even ignoring the assumptions, 20000 POH translates to some 2 years only.

'nuff said.

> It seems the drives they are marketing for blade server use are the 
> E#K##'s not the regular #K##'s. For example:
> http://www.hitachigst.com/portal/site/en/menuitem.ec03cadee7c6fb5deb4703e3aac4f0a0/

Yeah, and THAT one is specified for:
"732 hour POH monthly with continuous operation"

(which translates to 24/7)


CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0

More information about the juniper-nsp mailing list