在AIX中修改LTO设备的参数

在AIX中如何改变LTO设备的参数 如果在AIX中需要改变默认的参数如压缩、块大小、缓冲区等,可以使用 smit工具。 具体的方法如下: 1)确定AIX中要修改的设备(从0开始,所…

在AIX中如何改变LTO设备的参数

如果在AIX中需要改变默认的参数如压缩、块大小、缓冲区等,可以使用

smit工具。

具体的方法如下:

1)确定AIX中要修改的设备(从0开始,所以0对应驱动器1)

# lsdev -Cc tape
smc0 Available 14-08-00-6,0 IBM 3583 Library Medium Changer
rmt0 Available 14-08-00-0,0 IBM 3580 Ultrium Tape Drive
rmt1 Available 14-08-00-1,0 IBM 3580 Ultrium Tape Drive
rmt2 Available 30-68-01 IBM 3580 Ultrium Tape Drive (FCP)
smc1 Available 30-68-01 IBM 3584 Library Medium Changer (FCP)
rmt3 Available 30-68-01 IBM 3580 Ultrium Tape Drive (FCP)
smc2 Available 30-68-01 IBM 3584 Library Medium Changer (FCP)
rmt4 Available 30-68-01 IBM 3580 Ultrium Tape Drive (FCP)
smc3 Available 30-68-01 IBM 3584 Library Medium Changer (FCP)
通过上面的信息我们可以知道系统连接了两个磁带库:
a)用SCSI连接的3583,smc0带两个驱动器rmt0,rmt1。
smc0 Available 14-08-00-6,0 IBM 3583 Library Medium Changer
rmt0 Available 14-08-00-0,0 IBM 3580 Ultrium Tape Drive
rmt1 Available 14-08-00-1,0 IBM 3580 Ultrium Tape Drive

b)用光纤连接的3584,三个驱动器各自的control path都被使能。
rmt2 Available 30-68-01 IBM 3580 Ultrium Tape Drive (FCP)
smc1 Available 30-68-01 IBM 3584 Library Medium Changer (FCP)
rmt3 Available 30-68-01 IBM 3580 Ultrium Tape Drive (FCP)
smc2 Available 30-68-01 IBM 3584 Library Medium Changer (FCP)
rmt4 Available 30-68-01 IBM 3580 Ultrium Tape Drive (FCP)
smc3 Available 30-68-01 IBM 3584 Library Medium Changer (FCP)

1.1)假设我们要修改SCSI连接的3583上的SCSI ID=2的驱动器的参数:

通过分析我们可以确定rmt1的SCSI ID是1,正是我们要修改的对象。

1.2)假设我们要修改光纤连接的3584上的驱动器的参数:

我们还要通过三个驱动器的WWN来区分他们。首先驱动器的WWN可以

通过驱动器上面的标签得到,然后你可以使用lsattr命令得到WWN和

设备名的对应关系:

#lsattr -El rmt2
block_size 0 Block Size (0=Variable Length) True
compress yes Use Hardware Compression on Tape True
autoload no Use Autoloading Feature at End-of-Tape True
logging no Activate volume information logging True
max_log_size 500 Maximum size of log file (in # of entries) True
space_mode SCSI Backward Space/Forward Space Record Mode True
rew_immediate no Use Immediate Bit in Rewind Commands True
trailer_labels no Trailer Label Processing True
retain_reserve no Retain Reservation False
devtype ULT3580- Device Type False
scsi_id 0x213ca SCSI Target ID True
lun_id 0x0 Logical Unit Number True
location Location True
ww_name 0x5005076300410803 World Wide Name False
new_name New Logical Name True

1.3)如果驱动器上没有WWN标签,或复杂的SAN环境,或使用FC-SCSI-GATAWAY

的情况我们可以通过SAN交换机来确定,限于篇幅这里不做介绍。

2)参数:

3.1)显示现有参数的命令:

# lscfg -vl rmt1
DEVICE LOCATION DESCRIPTION
rmt7 30-68-01 IBM 3580 Ultrium Tape Drive (FCP)
Manufacturer…………….IBM
Machine Type and Model……ULT3580-TD1
Serial Number……………6811288675
Device Specific.(FW)……..25D4

#lsattr -El rmt2
block_size 0 Block Size (0=Variable Length) True
compress yes Use Hardware Compression on Tape True
autoload no Use Autoloading Feature at End-of-Tape True
logging no Activate volume information logging True
max_log_size 500 Maximum size of log file (in # of entries) True
space_mode SCSI Backward Space/Forward Space Record Mode True
rew_immediate no Use Immediate Bit in Rewind Commands True
trailer_labels no Trailer Label Processing True
retain_reserve no Retain Reservation False
devtype ULT3580- Device Type False
scsi_id 0x213ca SCSI Target ID True
lun_id 0x0 Logical Unit Number True
location Location True
ww_name 0x5005076300410803 World Wide Name False
new_name New Logical Name True

3.2)设置参数的方法:

我们可以使用SMIT工具修改某一个指定的LTO设备。

具体方法是:

3.2.1)#SMITTY
3.2.2)选择菜单Devices -> Tape Drive -> Change/Show
Characteristics of a Tape Drive.
3.2.3)选择我们指定的设备
3.2.4)修改参数:
Change / Show Characteristics of a Tape Drive
Type or select values in entry fields.
Press Enter AFTER making all desired changes.

[Entry Fields]
Tape Drive rmt0
Tape Drive type 3580
Tape Drive interface scsi
Description IBM 3580 Ultrium Tape
Status Available
Location 14-08-00-0,0
Parent adapter scsi1
Connection address 0,0
Block Size (0=Variable Length) [0]
Use Hardware Compression on Tape yes
Activate volume information logging no
Maximum size of log file (in # of entries) [500]
Backward Space/Forward Space Record Mode SCSI
Use Immediate Bit in Rewind Commands no
Trailer Label Processing no

比如我们可以修改不使用硬件压缩
Use Hardware Compression on Tape no

作者: admin

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