Hi Kevin,
A few suggestions,
SIZE_DATA_BUFFERS
-----------------
Make sure you have a file called
/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS
with a single number of "262144" in it.
This file controls the the blocksize used to write to the tape drive. LTO-2
needs a blocksize of "262144" (aka 256K) to achieve it's max. performance of
35MB/s.
Multiplexing
------------
Most clients are not able to deliver 35MB/s over the network to your
backupserver. Multiplex streams from multiple clients to fill up a tape drive
by setting:
- MPX of 4 in the storage unit definition
- MPX of 4 in the schedule
st
--
st is Solaris's "SCSI tape" driver. Sun delivers proper defaults for supported
configs hardcoded in st. Thus, do not modify st.conf and make sure you have the
latest st patch (113277-17 for s9 or 108725-14 for s8)
Incoming
--------
Make sure enough data is comming IN to make six LTO's happy. 6 x 35 = 210MB/s.
This needs 4 to 5 gigabit ethernet's trunked or balanced. If you use SSO, make
sure the SIZE_DATA_BUFFERS file exists on all of your media servers (ehhrm
clients).
large # of files
----------------
If you have clients with a large number of files, consider the bp.conf setting
DO_NOT_RESET_ACCESS_TIME = 1
Hth, Joost
>
>Config : V480, X6768A FC HBA, L180 with 6 x LTO-II Fibre drives connected
>via SANBridge x16 2GB switch. Drives are in 2 split zones [3 in each]. Host
>has NB DC 4.5FP3 patched to MP5 installed.
>Problem: Drives are only running about 20M per sec, in line tape copy is
>VERY slow [slower than our SCSI L60], restores are even worse. In fact I
>think I can safely say at the moment our 100k L180 is only slightly faster
>than our old SCSI L60.
>
>Can anyone shed any light on why? If so - what can we do about it?
>
>Thanks people.
>
>> ----------------------------------------------------
>> Kev Smith
>> Unix Systems Administrator.
>> Operational Support, IND Croydon.
>> * E-Mail : kevin.m.smith AT siemens DOT com
>> * Tel : 020 8760 4849
>> * Mobile : 07808 828595
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Long may you run.
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