From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 4 Oct 2002 06:22:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 4 Oct 2002 06:22:01 -0400 Received: from mailsun.llgc.org.uk ([193.61.220.2]:8891 "EHLO mailsun.llgc.org.uk") by vger.kernel.org with ESMTP id ; Fri, 4 Oct 2002 06:21:59 -0400 Message-ID: <3D9D6C84.F1736E15@llgc.org.uk> Date: Fri, 04 Oct 2002 11:25:08 +0100 From: Illtud Daniel Organization: Llyfrgell Genedlaethol Cymru X-Mailer: Mozilla 4.77 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 To: Effrem Norwood CC: Kanoalani Withington , Roy Sigurd Karlsbakk , jbradford@dial.pipex.com, jakob@unthought.net, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org Subject: Re: RAID backup References: Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Effrem Norwood wrote: > In addition, HSM software costs > something (even if you write it yourself) on top of the tape infrastructure. > One customer of ours was quoted 40K per TB of HSM *software* alone. I've got 25TB uncompressed of HSM here, and it's cost us (ex VAT) roughly: £10k for the first 1.6TB (on NT, DLT library) £18k for the next 6.0TB (on NT, LTO library) £45k for the next 18.0TB (on Solaris, LTO Library) ...for the software licencing alone. Plus about 10% pa. in support costs. You're looking at about 50-60% of the library cost for the HSM software to manage it (tapes are another thing). Is HSM really that difficult? It really is a racket, but it's not so much compared with the cost of re-producing the data (mainly digitized collections). I'd be happier about it if they were more reliable (libs and s/w). Disk arrays, on the other hand, would cost us a fortune in upgrading the cooling - we've had to do this once just because of the 3-4 TB of online storage we've got, and adding huge exchangers (and associated pipes) isn't something I want to do much of. Oh, and having spent much of last night and this morning dealing with multiple SCSI disk failures, and having seen about 5% of ours fail in a year, I'm rapidly seeing the light on IDE. -- Illtud Daniel illtud.daniel@llgc.org.uk Uwch Ddadansoddwr Systemau Senior Systems Analyst Llyfrgell Genedlaethol Cymru National Library of Wales Yn siarad drosof fy hun, nid LlGC - Speaking personally, not for NLW