Effrem Norwood wrote: > 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. -- Illtud Daniel illtud.daniel@llgc.org.uk Uwch Ddadansoddwr Systemau Senior Systems Analyst Llyfrgell Genedlaethol Cymru National Library of Wales Yn siarad drosof fy hun, nid LlGC - Speaking personally, not for NLW - 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
