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From: Gionatan Danti <g.danti@assyoma.it>
To: Zdenek Kabelac <zkabelac@redhat.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Thin metadata volume bigger than 16GB ?
Date: Sat, 23 Jun 2018 12:14:48 +0200	[thread overview]
Message-ID: <0bfbc3719a0796551c685b9f3925ca40@assyoma.it> (raw)
In-Reply-To: <b6977938-ecdb-46d8-9c45-8ac048f713b1@redhat.com>

Il 22-06-2018 22:13 Zdenek Kabelac ha scritto:
> 
> Addressing is internally limited to use lower amount of bits.
> 
> Usage of memory resources, efficiency.
> 
> ATM we do not recommend to use cache with more then 1.000.000 chunks
> for better efficiency reasons although on bigger machines bigger
> amount of chunks are still quite usable especially now with cache
> metadata format 2.

Does it means that with a 64 KB cache chunk size I can efficiently cache 
only up to 64 KB * 1000000 = ~60 GB volume?
So for, say, a 64 TB volume do I need to use 64 MB cache chunks?

> ATM drop data you don't need  (fstrim filesystem).
> 
> So far there were not many request to support bigger size although
> there are plans to improve thin-pool metadata format for next version.
> 
> Regards
> 
> Zdenek

Extremely informative answer, thanks a lot.

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8

      reply	other threads:[~2018-06-23 10:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-22 18:10 [linux-lvm] Thin metadata volume bigger than 16GB ? Gionatan Danti
2018-06-22 20:13 ` Zdenek Kabelac
2018-06-23 10:14   ` Gionatan Danti [this message]

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