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From: Gandalf Corvotempesta <gandalf.corvotempesta@gmail.com>
To: Wols Lists <antlists@youngman.org.uk>
Cc: Linux RAID Mailing List <linux-raid@vger.kernel.org>
Subject: Re: RAID10, 3 copies, 3 disks
Date: Sat, 11 Jan 2020 22:36:21 +0100	[thread overview]
Message-ID: <CAJH6TXjQ+vLSOJGH_7-mAeRREBSSTS5DTxXFtz2SU06wfhc4gA@mail.gmail.com> (raw)
In-Reply-To: <5E1A3D4F.30205@youngman.org.uk>

Il giorno sab 11 gen 2020 alle ore 22:25 Wols Lists
<antlists@youngman.org.uk> ha scritto:
> Multiple 3-way mirrors (1+0) requires disks in multiples of 3. Raid10
> simply requires "4 or more" disks. If you expect/want to expand your
> storage in small increments, then 10 is clearly better. BUT.

I'll start with 8TB usable (more than enough for me atm) and would be ok
for at least 1 year, thus saving space is not a problem. Next year, if needed,
i'll add 3 disks more (or i'll grow the existing ones)

> Depending on your filesystem - for example XFS - changing the disk
> layout underneath it can severely impact performance - when the
> filesystem is created it queries the layout and optimises for it. When I
> discussed it with one of the XFS guys he said "use 1+0 and add a fresh
> *set* of disks (or completely recreate the filesystem), because XFS
> optimises layout based on what disks it thinks its got."

No XFS, i'll use ext4.
I had *TONS* of issues with XFS

  reply	other threads:[~2020-01-11 21:36 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-11  7:06 RAID10, 3 copies, 3 disks Gandalf Corvotempesta
     [not found] ` <82a7d9ec-f991-ad25-bf1f-eee74be90b1b@youngman.org.uk>
2020-01-11 20:55   ` Gandalf Corvotempesta
2020-01-11 21:25     ` Wols Lists
2020-01-11 21:36       ` Gandalf Corvotempesta [this message]
2020-01-14 12:28         ` Nix

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