> > 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. 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 Betacam(tm) studio VCRs, and stores 200 Gigs uncompressed on one large tape, (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 would be my backup system of choice, if I needed the capcity, (I currently use punched Myler tape :-) ). John. - 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
