From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans Reiser Subject: Re: NFS setup for a reiserfs-based /home Date: Thu, 26 Sep 2002 00:37:43 +0400 Message-ID: <3D921E97.3050107@namesys.com> References: <20020924215756.GA24963@jerry.marcet.dyndns.org> <20020925114009.B23339@namesys.com> <200209251533.19567.Dieter.Nuetzel@hamburg.de> <20020925173718.A17138@namesys.com> <20020925154626.S32363@noris.de> <20020925175128.A3477@namesys.com> <20020925160957.U32363@noris.de> <3D91FFA5.9010909@namesys.com> <3D920F90.7060206@edsons.demon.nl> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Reiserfs mail-list Cc: =?ISO-8859-1?Q?Philippe_Gramoull=E9?= Somebody wrote: >> Hans, >> >> which HW RAID controllers would you advice? >> >> Cheers, >> > > Unfortunately I just don't know. We can't afford them at Namesys.....;-) I am going to test some of Philippe's RAID equipment for Reiser4 (his company sponsors Reiser4 with a very substantial service contract), I should probably add the following test. Try putting putting some data into the FS that is small enough to fit into the RAID card NVRAM, letting it go idle for an hour, yanking the power cord out, and then putting another RAID card which is the same brand card in as a replacement for your card while the machine is off, rebooting, and seeing what happens to your data. If I understand properly from a few users, there exist some cards/RAID units for which the data will be non-existent on the disks. I would not use such cards myself. I think it would be useful if the identity of such cards became known. Notice how I avoid saying any names because I want to see it reproduced independently first before I say any names. These users I know about found out by equipment failing, and one should always be careful about reproducing the cause for such events before repeating the story to others. RAID controllers going kaput are not any rarer than any other PC cards going kaput, so.... You probably all know people who didn't backup a RAID device, and the controller scribbled garbage to disk, and the source code repository or other mission critical datastore..... Hans