Subject: Re: RAID In general (Re: Hot Swappable IDE Kits)
To: Greywolf <firstname.lastname@example.org>
From: Wojciech Puchar <email@example.com>
Date: 04/18/2003 08:00:23
> (me)> ...much about speed and data size omitted...
> WP> but not with DAT media or CD-RW
> You obviously missed the speed/size thing.
speed is not a problem as it works in background and doesn't lock the
CD-RW isn't that slow now (up to 24x CD-RW)
> Several points:
> * DDS-4 drives still run a hefty chunk of change, and DDS-4 media aren't
> that cheap. And the drives are still slow. Last I checked, drives were
> $500 or more, and media is $25 each, and you get 20GB on a tape.
no problem to buy for $15 in Poland. anyway not THAT cheap.
> Initial cost to back up 100GB: $625 plus applicable taxes. Subsequent
> cost to back up 100GB: $125 + applicable taxes. Speed: slow. Setup
> considerations: low.
> * CD-RW is slow, and you still only get 800MB/CD. Does anyone out there
> have the courage to run 'dump 0usdf 16000 64000 - / | cdrecord [args]'
do you have example how to do multivolume backups with command?
i have problems with dump/cdrecord and file fifos to do it.
> and not worry about creating a coaster? Or would one have to pre-split
> the backups into 800MB chunks and iso them before cd-recording them?
> This would defeat the purpose entirely. Cost for a burner: $60.
> 100GB/0.8GB = 125 CD-RW. Price per CD-RW: $1. Initial cost: $185 + tax.
> Subsequent cost: $125 + tax. Speed on writing: slow. Speed on reading:
> Acceptable. Setup considerations: high.
> * HD might run a little more. I've seen 100GB drives for $125 on sale,
> maybe $150 otherwise. (IDE, obviously, since that's what we're discussing).
for SCSI-only systems SCSI-to-IDE bridge for 60-70$ could be bought, which
give possibility to hot-plug/unplug (SCSI devices can be rescaned and can
be hot plugged)
> Initial cost: $150 + tax. Subsequent cost: $150 + tax, probably less
> as HD prices go down. Speed on reading and writing: fast. Setup
> considerations: low.
> This all misses the point that hot-swappable IDE would STILL be really nice
> to have, for a variety of reasons.
yes it is.
i'm just worried about how long hard disk will survive being often turned
on/off, changed temperatures etc..
hard drives last very long if used constantly but don't like rapid
if long - it's worth of using. for example SCSI-only system with fast
(and expensive) disks, + SCSI hot-plug rack+SCSI-to-IDE converter and
couple of cheapest low end IDE drives as backup