Date: Tue, 23 Mar 1999 00:49:50 -0800 (PST) From: Beau James <bjames@cisco.com> To: oa@razorfish.fi Cc: aic7xxx@FreeBSD.org Subject: Re: SOFTWARE-RAID-TIPS (was: Adaptec 7890 and RAID portIII RAID controller Linux Support) Message-ID: <199903230849.AAA00831@frogger.cisco.com>
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--> dump/restore work on entire filesystems below the OS filesystem layer --> (thus allowing a backup/restore without touching file access or --> modification times, which is nice). That means it's not easy (or even --> possible?) to back up less than the entire filesystem. Got it. That's a limitation of the Linux port of BSD dump; Solaris dump accepts file lists which do not have to be complete partitions. --> Combined with the fact that dump has no built-in compression Though most tape drives have hardware compression these days. --> and does --> not handle multi-volume archives on Linux, it's not the most ideal --> choice for backing up large RAID filesystems. Ouch. I'd not noticed that in the "BUGS" list, and hadn't overflowed a tape (yet). --> > With most reasonable-capacity tape drives these days, that seems like a --> > small win. --> --> What do you consider a reasonable capacity? I'm dealing with 30 GB --> systems on a daily basis, and I don't consider that a particularly --> large system (the administrators at our other offices work with 120 GB --> and larger filesystems). 100GB per tape would be a reasonable capacity --> for me. Unfortunately, 100GB tape equipment is nowhere near reasonable --> to purchase. US$2.5K for 12/24 GB DAT; US$4.5 K for 140/280 GB DLT. But "reasonable" is in the eye of the buyer, of course. Thanks, Beau To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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