From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: Gregory Farnum <greg@inktank.com>
Cc: ceph-devel@vger.kernel.org
Subject: Re: Designing a cluster guide
Date: Tue, 22 May 2012 08:20:59 +0200 [thread overview]
Message-ID: <4FBB304B.2050709@profihost.ag> (raw)
In-Reply-To: <CAPYLRzj8Ozv_L1FSONbR0Kovn_hdXz9YN5bXnAskgdv0s4COvQ@mail.gmail.com>
Am 21.05.2012 20:13, schrieb Gregory Farnum:
> On Sat, May 19, 2012 at 1:37 AM, Stefan Priebe <s.priebe@profihost.ag> wrote:
>> So would you recommand a fast (more ghz) Core i3 instead of a single xeon
>> for this system? (price per ghz is better).
>
> If that's all the MDS is doing there, probably? (It would also depend
> on cache sizes and things; I don't have a good sense for how that
> impacts the MDS' performance.)
As i'm only using KVM / rbd i don't have any MDS.
> Well, RAID1 isn't going to make it any faster than just the single
> SSD, is why I pointed that out.
>
> I wouldn't recommend using a ramdisk for the journal — that will
> guarantee local data loss in the event the server doesn't shut down
> properly, and if it happens to several servers at once you get a good
> chance of losing client writes.
Sure but it's the same WHEN NOT using a Raid 1 for the journal isn't it?
Stefan
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next prev parent reply other threads:[~2012-05-22 6:20 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-10 12:09 slow performance even when using SSDs Stefan Priebe - Profihost AG
2012-05-10 13:09 ` Stefan Priebe - Profihost AG
2012-05-10 18:24 ` Calvin Morrow
2012-05-10 13:23 ` Designing a cluster guide Stefan Priebe - Profihost AG
2012-05-17 21:27 ` Gregory Farnum
2012-05-19 8:37 ` Stefan Priebe
2012-05-19 16:15 ` Alexandre DERUMIER
2012-05-20 7:56 ` Stefan Priebe
2012-05-20 8:13 ` Alexandre DERUMIER
2012-05-20 8:19 ` Christian Brunner
2012-05-20 8:27 ` Stefan Priebe
2012-05-20 8:31 ` Christian Brunner
2012-05-21 8:22 ` Stefan Priebe - Profihost AG
2012-05-21 15:03 ` Christian Brunner
2012-05-20 8:56 ` Tim O'Donovan
2012-05-20 9:24 ` Stefan Priebe
2012-05-20 9:46 ` Tim O'Donovan
2012-05-20 9:49 ` Stefan Priebe
2012-05-21 14:59 ` Christian Brunner
2012-05-21 15:05 ` Stefan Priebe - Profihost AG
2012-05-21 15:12 ` Tomasz Paszkowski
[not found] ` <CANT588uxL7jrf1BfowUeer_AnDTfGjzkWVFhS4aNMaMSst_jyA@mail.gmail.com>
2012-05-21 15:36 ` Tomasz Paszkowski
2012-05-21 18:15 ` Damien Churchill
2012-05-21 20:11 ` Stefan Priebe
2012-05-21 20:13 ` Tomasz Paszkowski
2012-05-21 20:14 ` Stefan Priebe
2012-05-21 20:19 ` Tomasz Paszkowski
2012-05-21 15:07 ` Tomasz Paszkowski
2012-05-21 21:22 ` Sławomir Skowron
2012-05-21 23:52 ` Quenten Grasso
2012-05-22 0:30 ` Gregory Farnum
2012-05-22 0:42 ` Quenten Grasso
2012-05-22 0:46 ` Quenten Grasso
2012-05-22 5:51 ` Sławomir Skowron
2012-05-29 7:25 ` Quenten Grasso
2012-05-29 16:50 ` Tommi Virtanen
2012-05-22 9:04 ` Jerker Nyberg
2012-05-23 5:31 ` Gregory Farnum
2012-05-23 19:47 ` Jerker Nyberg
2012-05-23 21:47 ` Gregory Farnum
2012-05-24 8:33 ` Jerker Nyberg
2012-05-22 6:30 ` Stefan Priebe - Profihost AG
2012-05-22 6:59 ` Sławomir Skowron
2012-05-21 18:13 ` Gregory Farnum
2012-05-22 6:20 ` Stefan Priebe - Profihost AG [this message]
2012-06-29 18:07 ` Gregory Farnum
2012-06-29 18:42 ` Brian Edmonds
2012-06-29 18:50 ` Gregory Farnum
2012-06-29 20:59 ` Brian Edmonds
2012-06-29 21:11 ` Gregory Farnum
2012-06-29 21:18 ` Brian Edmonds
2012-06-29 21:30 ` Gregory Farnum
2012-06-29 21:33 ` Sage Weil
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