ZFS: Memory needed for managing L2ARC

[Vladimir Sharun]

Depending on average block size cached. In my experience it varies from 0,3% to 5%. If you store lot of small files, consider 5-6%, mostly large files - 0,5%. 


Dear colleagues,

are there any "real" estimations on how much memory is needed for having 
efficient, say, 1T of L2ARC?  stable/amd64, of course.

I have backup storage server, where pool size is targeted to a few hundreds of 
terabytes (currently ~35T), and hot set is usually less than 512G-1T.

quick googling leads to some Solaris/Illumos documents, but even them are not 
bright enough in answer that.

Thanks!

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck at FreeBSD.org  ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru  ***
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