On Mon, 2010-05-17 at 15:08 -0400, Paul Mather wrote:
> 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 fully
> supported? The Bacula documentation indicates the SuperLoader works fully
> under Bacula, though not explicitly whether under FreeBSD.
>
> The backup server will serve a GigE 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 (i.e., 6 TB in this case), 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?
ZFS loves ram. More ram = better performance. I'm not at all familiar
with zfs performance on feebsd but zfs version 13 that's used on freebsd
8 is pretty old. ZFS is currently at version 22.
I/O stalls? Is that a freebsd issue?
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