From: Drew <drew.kay@gmail.com>
To: Roberto Spadim <roberto@spadim.com.br>
Cc: Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: Best configuration for bcache/md cache or other cache using ssd
Date: Wed, 18 Sep 2013 06:59:48 -0700 [thread overview]
Message-ID: <CACJz6QtVzR1bED939ZkesyXMWjv-2DmxZSrGH_enKX5dCuNEJw@mail.gmail.com> (raw)
In-Reply-To: <CAH3kUhHrK-TKJD1s_7SvtOz=YnpO82EvMGPv0X8rVAaDcuTO0Q@mail.gmail.com>
> HDD will be a SATA 7200rpm with 2TB, SSD will be ~ 160GB or less (must
> be cheap and enterprise level)
>
> he wants a RAID1 level over HDD and a cache (bcache/or md cache layer
> of kernel 3.9) over this md device (raid1)
What is the client's workload? What is he trying to do with this machine?
At first glance (without any information) the requirements don't make
sense. Placing a SSD based cache in front of a pair of slow 7200RPM
SATA's sounds like he's trying to get SSD performance at SATA prices.
It could work but if he's hammering the disks enough to need SSD
performance, those SATA's just won't keep up.
--
Drew
"Nothing in life is to be feared. It is only to be understood."
--Marie Curie
"This started out as a hobby and spun horribly out of control."
-Unknown
next prev parent reply other threads:[~2013-09-18 13:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-17 19:20 Best configuration for bcache/md cache or other cache using ssd Roberto Spadim
2013-09-18 13:59 ` Drew [this message]
[not found] ` <CAH3kUhHin5PfjDCNFjD8eypNML=0YrkQp14DrCADc2StcODdaw@mail.gmail.com>
2013-09-18 15:39 ` Fwd: " Drew
2013-09-18 16:00 ` Mark Knecht
2013-09-18 15:51 ` Fwd: " Roberto Spadim
2013-09-18 16:07 ` Tommy Apel
[not found] ` <CAH3kUhEWUe=20ovmd5BT3kzmYn25YS3Np5R3jPiJDBEAhAOb_A@mail.gmail.com>
2013-09-18 16:27 ` Tommy Apel
2013-09-18 17:15 ` Drew
2013-09-18 17:33 ` Roberto Spadim
2013-09-19 2:26 ` Stan Hoeppner
2013-09-19 3:42 ` Roberto Spadim
2013-09-19 7:47 ` Stan Hoeppner
2013-09-19 15:30 ` Roberto Spadim
2013-09-19 15:49 ` Benjamin ESTRABAUD
2013-09-19 16:23 ` Roberto Spadim
2013-09-19 16:31 ` Benjamin ESTRABAUD
[not found] ` <CAH3kUhE33h=7D6r7KO9VvQRN5qrZS+cad KUBQW8POFYvyGsS3w@mail.gmail.com>
[not found] ` <523B3185.3020309@mpstor.com>
2013-09-19 23:22 ` Stan Hoeppner
2013-09-24 5:06 ` Roberto Spadim
2013-09-24 6:11 ` Roberto Spadim
2013-09-24 7:18 ` Tommy Apel
2013-09-24 8:29 ` Stan Hoeppner
2013-09-24 12:12 ` Bradley D. Thornton
2013-09-25 2:32 ` Stan Hoeppner
2013-09-25 2:44 ` Stan Hoeppner
2013-09-25 4:35 ` Roberto Spadim
2013-09-25 5:53 ` Stan Hoeppner
2013-09-19 22:15 ` Stan Hoeppner
2013-09-19 22:50 ` Roberto Spadim
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