How many ram...

[Linda Kateley]

I teach a class on openzfs hardware architecture... and what I typically 
recommend is to use a raidset that is operationally sound. For example 
if you have a 24 disk jbod... setup as either 12 mirrors or 8 raidz1 3 
disk sets 4 6 disk raidz2.. and so on..

If you plan to add storage(and storage needs always increase) and add 
additional 24 bay jbods.. think in terms of how you will add the sets to 
the pool.

The common understanding of raid is a little different in zfs. ZFS will 
write what it has to write into what it has to write with..

This blog describes well. 
http://blog.delphix.com/matt/2014/06/06/zfs-stripe-width/

linda

On 1/14/15 11:00 AM, Albert Shih wrote:
>   Le 14/01/2015 à 10:50:18-0600, Linda Kateley a écrit
>> I will say one more thing.. I also have a customer who uses zfs for
>> security camera storage. The cameras deliver 100's of k bytes per
>> minute... But they save the data for a very very very long time. That
>> kind of system would need very little ram(maybe 8GB) but lots and lots
>> of disk.
> Thanks you very much.
>
> May I ask you something (feel free to not answer of course ). I saw on your
>
>>>> 32GB ram. http://kateleyco.com/?p=815
> you have install I quote
>
>    «hey will have 252 4TB drives in 6 45-drive chassis with multiple
>    controllers»
>
> do you have any idea how many pool they have ? how many disk they put in
> one raid ? how many raid they put in one pool ?
>
> Actually I've one server a very big pool (I known some tell me it's too
> big) with 72 disks in 6 raidz2.
>
> Thanks.
>
> Regards.
>
> JAS
> --
> Albert SHIH
> DIO bâtiment 15
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> Heure local/Local time:
> mer 14 jan 2015 17:54:33 CET