On 13 oct. 2009, at 15:24, Derek Anderson wrote:
Simple answer: Man hour math. I have 150 virtual machines on these disks for shared storage. They hold no actual data so who really cares if they get lost. However 150 users of these virtual machines will save 5 minutes or so every day of work, which translates to $250. So $3,000 in SSD's which are easily replaced one by one with zfs saves the company $250,000 in labor. So when I replace these drives in 6 months, for somewhere around $1500 its a fantastic deal.
Overall, I think this is a reasonable model for the medium sized enterprise to work with. As in most cases the mythical 5 minutes saved with be invisible to the overall operations, and difficult to justify to management, but if you can squeeze it into an annual operating budget rather than a capital expense that requires separate justification you should be good.
The only bad part is I cannot estimate how much of the old disks have life is left because in a few months, I am going to have a handful of the fastest SSD's around and not sure if I would trust them for much of anything.
As for what to do with the SSDs - you can resell them or give them to employees (being clear on their usage and provenance) since they represent a risk in a high volume enterprise environment, but could probably supply several years worth of service in a single-user mode. I'd be very happy to get a top of the line SSD at half price for my laptop for a year's projected use...knowing of course that I backup daily as a matter of religious observance :-)
Cheers, Erik _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
