-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/02/2015 01:36 PM, Jon LaBadie wrote: | On Tue, Dec 01, 2015 at 10:28:27PM +0000, Debra S Baddorf wrote: |> I agree with Alan’s comment. You shouldn’t need - - notaper. |> (But you CAN use it
Thanks all, I think I understand now. It's a bit more subtle than understanding Amanda config (which I don't yet!) The filesystem to be backed up consists of 9 directories, where almost every file is hard-linked into the other 8 directories. [It's daily backups and incrementals, where if the file is unchanged, it's hard-linked to the other identical copies.] While df and du both show the backup to be 990Gb, a naive view (not taking into account hard links) shows it at over 7Tb. The Amanda size estimator shows 7Tb (via amstatus), not 990Gb, hence, it's way too big for my 1.5Tb holding area. Web searches on the subject seem to indicate that the Amanda backups _will_ preserve hard links (hence only backing up 990Gb), so if I let the backup run, it would have worked (but shoe-shined unacceptably). On a faster drive, the shoe-shine wouldn't have mattered, but it would have bleated about not having enough tapes (even tho it wouldn't use them). To get around this, I tar'd it to a file (result just over 1TB), which Amanda was perfectly willing to copy to holding area (albeit not necessary in this case), and then stream to the drive. Annoying - extra steps and extra tar wrapping - would be nice if the estimator got it right. I've not dived into the Amanda planner/estimator code, is it possible for it to take into account hard links? [If it required coding, potentially it's simple: by making the assumption that every target of a hard link is going to be backed up in the same run, so you could divide every file's size by it's link count. Otherwise, you have to do the accounting that du/tar/rsync does. ] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQEcBAEBAgAGBQJWX5xeAAoJENy2YTBCU1ml9aQH/iawzDbRdj4b25lHaCbMJUfw VIdij1M7omAg/zewEIQVnPG8fM5hEjSTnISLPfQIsDVGDxHpLmR6m3h8OmfSDi93 hnX5vod3kI+kEr+OaF8nGQPDwzIlKEWgdCOyQQ+fT+FDEs70bRuXBy0boBYgXB3V HRCKx23r4rH4J9iKBZ7AaQWqkjDHnwzfZvPxzIvAA6MGTNPRSXms4A00Vk6oMAZC 1K/+v0taPssuJlDOAP1Qp7FlrJto6hdc4ZbwrLsyqDjsSpowBq4t5ioz7obOiOCf P1p3sRcQS9SQTyGoLDyA2RXIJaVgnsVaRPle4FxziY9xTSNCJyF7ATkr+jR1MYM= =SJ4S -----END PGP SIGNATURE-----
