From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Evans Subject: Re: RAID5 Date: Fri, 23 Apr 2010 20:34:02 -0700 Message-ID: References: <4BCEFE66.6010607@tmr.com> <4BD1AE0C.2040003@msgid.tls.msk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mikael Abrahamsson Cc: Michael Tokarev , Bill Davidsen , Kaushal Shriyan , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, Apr 23, 2010 at 6:47 PM, Mikael Abrahamsson = wrote: > On Fri, 23 Apr 2010, Michael Evans wrote: > >> devices, but now everyone is selling SDDs which are broken for such >> needs. =A0Any ram drive units still being sold seem to be more along >> data-center grade sizes. > > http://benchmarkreviews.com/index.php?option=3Dcom_content&task=3Dvie= w&id=3D308&Itemid=3D60 > > Basically it's DRAM with a battery backup and a CF slot where the dat= a goes > in case of poewr failure. It's a bit big and so on, but it should be = perfect > for journals... Or is this the kind of device you were referring to a= s "data > center grade size"? > > Some of te SSDs sold today have a capacitor for power failure as well= , so > all writes will complete, but they're not so common. > > -- > Mikael Abrahamsson =A0 =A0email: swmike@swm.pp.se > Yeah, that's in the range I call 'data center grade' since the least expensive model I can find using search tools is about 236 USD. For that price I could /buy/ two to three hard drives and get nearly the same effect by reusing old drives (but wasting more power). I should be able to find something with a cheep plastic shell for mounting and a very simple PCB that has slots for older ram of my selection, and a minimal onboard CPU for less than 50USD; I seriously doubt the components cost that much. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html