Date: Thu, 13 May 2010 21:29:48 -0400 From: Paul Mather <paul@gromit.dlib.vt.edu> To: freebsd-questions@freebsd.org Subject: Quantum SuperLoader 3 under Bacula on FreeBSD 8 Message-ID: <DAA8CE35-81D0-43D6-97BC-E8CB897F97A5@gromit.dlib.vt.edu>
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I am currently assembling a quote for an LTO-4 tape backup system. So = far, I am looking at using a 16-slot Quantum SuperLoader 3 with LTO-4HH = drive as the tape unit. Married to this will be a server to act as the = backup server that will drive the tape unit using Bacula to manage = backups. The server will be a quad core X3440 system with 4 GB of RAM = and four 1 TB SATA 7200 rpm hard drives in a case that has room for = eight hot-swap drives. I plan on using FreeBSD 8 on the system, using = ZFS to raidz the drives together to provide spool space for Bacula. I = will be using an Areca ARC-1300-4X PCIe SAS card to interface with the = tape drive. My main question is this: is the Quantum SuperLoader 3 LTO-4 tape drive = supported by Bacula 5 on FreeBSD? In particular, is the autoloader = supported? The Bacula documentation indicates the SuperLoader works = fully under Bacula, though not explicitly whether under FreeBSD. The backup server will serve a network cluster of perhaps a dozen = machines with over 6 TB of storage, most of which is on the cluster's = NFS server. Does anyone have good advice on sizing the = spool/holding/disk pool for a Bacula server? Is it imperative to have = enough disk space to hold a full backup, or is it sufficient to have = enough space to maintain streaming to tape? (I don't have much = experience of Bacula, having used it only to back up to disk.) In other = words, do I need more 1 TB drives in my backup server? Finally, is 4 GB of RAM sufficient for good performance with ZFS? Will = ZFS on FreeBSD be able to maintain full streaming speeds to tape, given = the various reports of I/O stalls under ZFS reported recently? Thanks in advance for any advice or information. Cheers, Paul.=
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