[Veritas-bu] how to deal with drive shoe-shining

You say from 'local disk to tape' im assuming you don't mean that the
volumes on the netbackup server itself are backing up slow, but the
network.  

If your talking about remote hosts over the network, (and assuming were
talking solaris) then you should check to be sure 100mb full is static
on both the host and switch as someone mentioned before.  To give some
more detail as im resolving one of these issues right now....

On the host/netbackup server /etc/system should contain a line like
(this particular one is a v240):

--
* Setting up Autonegotiation off and Full Duplex 100MBPS ON
set bge0:bge_adv_autoneg_cap=0
set bge0:bge_adv_100T4_cap=0
set bge0:bge_adv_100fdx_cap=1
set bge0:bge_adv_100hdx_cap=0
set bge0:bge_adv_10fdx_cap=0
set bge0:bge_adv_10hdx_cap=0
--

On cisco side you should see lines in the running-config for the
specific interface like (this is the 9th plate/port 48 on a 6509):

--
!
interface FastEthernet9/48
 no ip address
 duplex full
 speed 100
 switchport
 switchport access vlan XX
--

If you don't have your unix/cisco nic environment static I highly
recommend you do so, as 9 out of 10 problems I have had with
speed/bandwith between cisco and sun have been resolved setting these to
static on both ends.  Interestingly enough, only when we decided to get
rid of legato and move to netbackup did I even notice that we had these
network issues.  I guess you could say netbackup is a good network
performance tool.  Why cisco and sun cant play nice together with
regards to auto negotiation is beyond me, though were running a pretty
old IOS at my shop.

All that being said, I also use an L20, but w/ 2 DLT drives on solaris
10, and I get peak performance with the following: NUMBER_DATA_BUFFERS
16, SIZE_DATA_BUFFERS 65536.  All of this was set as per VTS performance
documentation I found online.  I rarely fall below the max capabilities
of the drives with these settings, though when I do it's almost
certainly my horribly old hardware I'm grabbing it from.

If all that doesn't help, what are the specs of your media server?
Maybe it can't hang with the traffic coming in?  Have you done tests
transferring large amounts of data between the machines you're having
problems with?  If its only one particular machine, it may sound silly,
but check the network cable path, I recently had sporadic nfs issues
because of a network wire that was wrapped around 2 emc power wires.
You never know what's below the tiles in a data center.



-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Charles
Ballowe
Sent: Thursday, October 13, 2005 5:59 PM
To: Anthony Tocco
Cc: Zhisong Jin; Veritas List
Subject: Re: [Veritas-bu] how to deal with drive shoe-shining

There is no MP5 for 5.1 -- there's MP3A which you should be running, +
the patches from yesterday.

-Charlie

On 10/13/05, Anthony Tocco <ttocco AT colltech DOT com> wrote:
> Have you checked to see if you are forcing your nic's and switches.
If
> they are set to auto negotiate then that could b e your issue.  Also
> upgrade it to MP5 there is network issues with mp3
>
> Tony Tocco
> ttocco AT colltech DOT com
>
>
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Zhisong
> Jin
> Sent: Thursday, October 13, 2005 4:28 PM
> To: Veritas List
> Subject: [Veritas-bu] how to deal with drive shoe-shining
>
> I have a SUN L20 tape library runing as a media server
> for veritas netbackup 5.1 on SUN solaris 9. the systems
> runs however SOMETIMES performance is terrible.
>
> for example, a recent backup from a local disk to tape
> got 60KB/s in throughput.
>
> enviroment : solaris 9, netbackup 5.1 MP3, drive cleaned regularly.
>
> on media server /etc/system:
> set shmsys:shminfo_shmmax=4294967295
> set shmsys:shminfo_shmmin=1
> set shmsys:shminfo_shmseg=10
> set shmsys:shminfo_shmmni=512
> set semsys:seminfo_semmns=2048
> set semsys:seminfo_semmni=2048
> set semsys:seminfo_semmsl=250
> set msgsys:msginfo_msgmni=1024
> set msgsys:msginfo_msgtql=1024
> set semsys:seminfo_semopm=128
>
> on media server  /usr/openv/netbackup/
>    NET_BUFFER_SZ = 262144  in /usr/openv/netbackup
>    SIZE_DATA_BUFFERS = 262144 in /usr/openv/netbackup/db/config
>    NUMBER_DATA_BUFFERS = 32;
>
> I even have an entry per veritis recommedation
>    SIZE_DATA_BUFFERS_DISK = 1048576
>    NUMBER_DATA_BUFFERS_DISK= 16
>
> can anybody offer some clues what is wrong here?
>
> Thanks.
> Jason
>
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