Re: Ultrium LTO2 & Performance?

[Matthias.Toberer@xxxxxxxxxxx]

Hallo

und danke fuer die vielen Tips.
Leider hat alles nicht viel geholfen.
Ich bekomme nach wie vor nur ca. 170mb/min auf das Band.
Wenn ich ein Backup anwerfe blinken die HDD LED's wie wild,
und nur ab und wann auch mal das LED des Bandlaufwerkes...
Was lieft da nur schief?

Hier mal was ich an Hardware habe:
- PERC5i Raid Controller 3Gbit 
- 300GB SAS HDD's (Raid5)
- PowerVault 110T LTO2 Tape-Drive

Output der Console:

mtst -f /dev/st0 status
SCSI 2 tape drive:
File number=2, block number=0, partition=0.
Tape block size 0 bytes. Density code 0x42 (no translation).
Soft error count since last status=0
General status bits on (81010000):
 EOF ONLINE IM_REP_EN

herkules:~ # cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 08 Lun: 00
  Vendor: DP       Model: BACKPLANE        Rev: 1.00
  Type:   Enclosure                        ANSI SCSI revision: 05
Host: scsi0 Channel: 02 Id: 00 Lun: 00
  Vendor: DELL     Model: PERC 5/i         Rev: 1.00
  Type:   Direct-Access                    ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 06 Lun: 00
  Vendor: CERTANCE Model: ULTRIUM 2        Rev: 1862
  Type:   Sequential-Access                ANSI SCSI revision: 03

herkules:~ # lsmod | grep st
st                     50716  0
scsi_mod              140168  6 
st,aic79xx,scsi_transport_spi,sg,megaraid_sas,sd_mod

herkules:~ #  modinfo st
filename: /lib/modules/2.6.16.21-0.25-bigsmp/kernel/drivers/scsi/st.ko
author:         Kai Makisara
description:    SCSI Tape Driver
license:        GPL
vermagic:       2.6.16.21-0.25-bigsmp SMP 586 REGPARM gcc-4.1
supported:      yes
depends:        scsi_mod
srcversion:     A2AA9FAD651958E35641B93
parm:           try_wdio:Try direct write i/o when possible (int)
parm:           try_rdio:Try direct read i/o when possible (int)
parm:           try_direct_io:Try direct I/O between user buffer and tape 
drive (1) (int)
parm:           max_sg_segs:Maximum number of scatter/gather segments to 
use (256) (int)
parm:           buffer_kbs:Default driver buffer size for fixed block mode 
(KB; 32) (int)

herkules:~ # dd if=/dev/zero of=/dev/st0 bs=64k count=16384
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 360.282 seconds, 3.0 MB/s


Mit freundlichen Gruessen - Best regards

Matthias Toberer

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