From mboxrd@z Thu Jan 1 00:00:00 1970 From: berk walker Subject: Re: [OT] best tape backup system? Date: Sat, 26 Feb 2005 18:09:56 -0500 Message-ID: <422101C4.20901@panix.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Mark Hahn Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids And worse yet, you have to run them to the end and then rewind them if you are going to keep the data for long [the magnetic fields affect layers near them]. An array of RAID1 disks, which sleep deeply [off] between uses would probably be affordable, and last MUCH longer. Just my 2 cents worth- ya, well, that's what you get for 2 cents. b- Mark Hahn wrote: >>Not sure if it is important to many people, but tapes take a lot less >>electricity than online disks. >> >> > >do you really care? an active disk is about 15W, inactive 5W >and asleep nearly zero. even assuming idle-but-spinning, >I make that as about $2/year. > >tapes are wonderful in every way except one: they're finicky >and difficult to care for properly. for instance, do you have >a humidity and temperature-controlled place to store them? >and have you actually logged the temp/hum for that to see >whether, for instance, it gets warm on weekends? > >if I were forced to use tapes, I would insist on making 2+ copies >of everything. note that this clearly hurt's tape's competitiveness >WRT price, size, bandwidth, etc. > >I don't see any new tape installations that are not driven by >secondary factors such as big piles of old data already on tape, >or someone wanting to physically move the media into a vault. > >(on that topic, I don't buy the idea that tape's less vulnerable >to hacking, either. just because your backup is on disk doesn't >mean that it's online or accessible. similarly, just because >your tape is in a separate cabinet doesn't mean that a sufficiently >motivated badguy could not get the tape put into some drive...) > >regards, mark hahn. >(buying many TB of disk this year and no tape) > >- >To unsubscribe from this list: send the line "unsubscribe linux-raid" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html > >. > > >