Hi there,

we currently use a ATL M2500 (3xLTO2) with Legato 6.1.4 on a Windows/2000
server and want to implement backup-to-disk for all primary backups.
Cloning and long retention pools would remain on the ATL. The remaining
B2D-alternatives are Quantum's DX30 and advanced filetype devices on a
dedicated S-ATA-based disk subsystem which would be a significantly
cheaper solution than the DX.
Already attached to the Legato-server by FC is a dedicated S-ATA-based
disk subsystem which is used among others for ESX/VMware-backups and for
online-backups from several MS SQL-servers (separated LUNs/partitions).
The SQL-server online-backup areas are backuped by Legato with on the
average 80 MBps, the ESX-backups however with just 15-16 MBps and the sole
reason for this is the heavy NTFS-fragmentation on this disk caused by the
backup tool. Verified also with uasm.
So since a small-scale test with advanced filetype devices on a NTFS-disk
(64K alloc unit size) also showed heavy NTFS-fragmentation I am getting
increasingly more unsure if AFDs are really an alternative to a virtual
tape library, at least under Windows. The bottleneck for the backup of my
big SAP- and fileservers is the Gigabit-Ethernet on the backup server and
I don't want to lose the good overall backup and clone performance with a
slow B2D solution.
Question: has anybody of you implemented (A)FDs on Windows and which
write/save resp. read/clone-performance do you achieve on these devices ?

thanks

Robert Schweizer

HERMA GmbH
Ulmer Strasse 300  -  70327 Stuttgart
Deutschland - Germany
robert.schweizer AT herma DOT de

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