From mboxrd@z Thu Jan 1 00:00:00 1970 From: jbradford@dial.pipex.com Subject: Re: RAID backup Date: Fri, 4 Oct 2002 12:12:21 +0100 (BST) Sender: linux-raid-owner@vger.kernel.org Message-ID: <200210041112.g94BCLLQ002034@darkstar.example.net> References: <3D9D6C84.F1736E15@llgc.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <3D9D6C84.F1736E15@llgc.org.uk> from "Illtud Daniel" at Oct 04, 2002 11:25:08 AM To: Illtud Daniel Cc: enorwood@effrem.com, kanoa@cfht.hawaii.edu, roy@karlsbakk.net, jakob@unthought.net, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org List-Id: linux-raid.ids > > In addition, HSM software costs > > something (even if you write it yourself) on top of the tape infras= tructure. > > One customer of ours was quoted 40K per TB of HSM *software* alone. >=20 > I've got 25TB uncompressed of HSM here, and it's cost us (ex VAT) > roughly: >=20 > =A310k for the first 1.6TB (on NT, DLT library) > =A318k for the next 6.0TB (on NT, LTO library) > =A345k for the next 18.0TB (on Solaris, LTO Library) >=20 > ..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 softwa= re > to manage it (tapes are another thing). Is HSM really that difficult? >=20 > 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. >=20 > 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. This is rapidly becoming off topic, especially for the kernel dev list,= which is why I originally just posted the following info to the cc'ed = people, but since it might be of interest, I'm posting it to the lists: Sony GY-8240-DTF2 tape drive, picture of it, with some info here: http://www.tomtec.co.jp/english/tape_hisped.html this uses similar technology to that which is used in their Digital Bet= acam(tm) studio VCRs, and stores 200 Gigs uncompressed on one large tap= e, (60 on a small tape). Data rate, 24 MB/s. You've got to have a lot of data for that to be insufficient, and it wo= uld be my backup system of choice, if I needed the capcity, (I currentl= y use punched Myler tape :-) ). John. - 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