Hi,
Quite a few questions so I'll put mu comments in the text
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of T. S. Kimball
Sent: Tuesday, January 25, 2005 8:44 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] AlphaStor: How many device slots will Legato use
for shared drive?
We're getting ready to setup our first shared (Fibre) drives in
Networker 7.1.2 for Solaris (aka Sun EBS). But I'm running across a
possible AlphaStor snag which I do not see answered before. Given my
previous experience with Legato on AlphaStor, I'd like to check here
before calling them.
We already have a mixed media solution for all direct-attatched devices,
over the Server and two Storage Nodes, so AlphaStor is in use. And we
have several Adv_file devices we'd like to setup as well.
Our starting config will be to replace one of our old DLT-7000 drives
with an LTO-2 FC-AL drive - for testing purposes - and share it between
the Server and SN1 (SN2 is set aside for a specialized, dedicated
solution).
But since AS is doing the drive sharing, how many devices in Networker
will this drive use?
-
This will count as two devices in Networker total device count and two
shared device licenses in AlphaStor.
-
Since this is a Logical drive in Networker, will it count as one device
total or two?
It will be seen as two logical drives (one seen by the networker server
and the other as a SAN storage node by the sharing device - will appear
as rd=servername:devicename)
Is there a special config for this in Networker?
-
No, well yes, but it is all taken care of by AlphaStor using the Library
config wizard (the devices are checked by AlphaStor by loading a tape
and checking on which drive, on each allowed host, that the tape can be
seen)
-
I have conerns since we'll eventually replace four DLT drives to shared
LTO-2, and if device slots are avail we'll look into sharing the
remaining DLT as well using a converter/SCSI router.
But I'd like to stay within the 48 total device limit, including 16 in
use for 8 planned adv_file devices.
-
Drives that are shared count as a device one each of the shared hosts,
the hosts that share the devices have to be set up as storage nodes (if
they are going to be handling data other than their own) or SAN storage
nodes. These storage nodes add to the total device count (can't remember
the numbers but it is something like 16, 32 or 64 devices depending on
version - don't quote me on that, I'm sure someone will put firm figures
to that) so you shouldn't run out of devices. Remember that you will
also need AlphaStor licenses for the shared devices.
-
Library is an L700 (Diff-SCSI to server), 7 DLT-7000 direct on server
(Diff-SCSI), 3 LTO-2 direct to SN2 (LVD-SCSI). AlphaStor is running on
SN1. The Adv_file devices will reside on server and SN1, direct
fibre-attatched (dual link, Veritas DMP).
Thanks in Advance,
--TSK
===== =====
Timothy S. Kimball Tel/Cell:201.725-8426 Fax:201.239-5780
System Administrator, 3rd/Night Shift tkimball AT brass DOT com
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