Re: [9fans] venti and "contrib": RFC

["John Floren" <john@jfloren.net>]

> On Thu, 05 Jan 2012 10:07:08 PST "John Floren" <john@jfloren.net>  wrote:
>>
>> For reference, I set up our current Plan 9 system about half a year
>> ago.  We have 3.8 TB of Venti storage total.  We have used 2.8 GB of
>> that, with basically no precautions taken to set anything +t; in
>> general, if it's around at 4 a.m., it's going into Venti.  I figure we
>> have roughly another 2,000 years of storage left at the current rate
>> :)
>
> I first read that "2.8 GB" as 2.8 TB and was utterly confused!
>
> You'd save a bunch of energy if you only powered up venti
> disks once @ 4AM for a few minutes (and on demand when you
> look at /n/dump).  Though venti might have fits! And the disks
> might too! So may be this calls for a two level venti? First
> to an SSD RAID and a much less frequent venti/copy to hard
> disks.
>
> venti doesn't have a "scrub" command, does it? zfs scrub was
> instrumental in warning me that I needed new disks.

Well, we need the venti disks powered on whenever we're using it,
right?  Since most of the filesystem is actually living on Venti and
fossil just has pointers to it?  Also, I think it's probably better
for disks to stay on all the time rather than go on-off-on-off.

And compared to the rest of the machine room, keeping a Coraid running
all the time isn't that big of a thing.



John