[Veritas-bu] HP Ultrium2 LTO II Drives Performance
2005-03-09 10:08:56
labsupport is not your Lucent handle wrote:
>Hello,
> I have installed a SUN L180 with 4 HP Ultrium2 drive (LTO2).
>Media and master server is SUN fire 6800 and having LVD SCSI.
> I am backing up all the data using Gigabit Ethernet. I am gating
>10 MB/s throughput on a Gigabit lan with 4 drives.
> Can any one tell what is the throughput you are gating on LTO2
>drives.
> Do I need to do any tune for OS or NB ? to get more performance.
>
>
>
>
Yes do the tuning. There is a guide
http://seer.support.veritas.com/docs/183702.htm
Also change the shared mem settings in /etc/system
* Message queues
set msgsys:msginfo_msgmap=512
set msgsys:msginfo_msgmax=8192
set msgsys:msginfo_msgmnb=65536
set msgsys:msginfo_msgmni=256
set msgsys:msginfo_msgssz=16
set msgsys:msginfo_msgtql=512
set msgsys:msginfo_msgseg=8192
* Semaphores
set semsys:seminfo_semmap=64
set semsys:seminfo_semmni=1024
set semsys:seminfo_semmns=1024
set semsys:seminfo_semmnu=1024
set semsys:seminfo_semmsl=300
set semsys:seminfo_semopm=32
set semsys:seminfo_semume=64
* Shared memory
set shmsys:shminfo_shmmax=16777216
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=220
set shmsys:shminfo_shmseg=100
These may have been updated
Im getting around 30 / 40 MB/s on my LTO2 sometimes peak at 70 according
to bptm logs. I am running over fibre to the drives though on an L700
and shared storage, but still you should be getting higher than 10
Cheers
Dave
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