scsimgr_esdisk(7)
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scsimgr_esdisk(7)
NAMEscsimgr_esdisk — SCSI class driver esdisk plug-in for scsimgrDESCRIPTIONThe SCSI class driver
plug-in for
implements management
and diagnostic operations specific to classes of devices bound to the
is the native HP-UX SCSI class driver that handles, by default,
all block devices including the following types : direct access, CD/DVD,
write-once read-multiple (WORM), and optical memory (OM).The plug-in handles the following operations for driver
Displays and clears driver
global statistics and the statistics
it maintains on instances of LUNs bound to it, and on related LUN paths.Displays status and other information maintained by driver
on LUNs bound to it.Gets, sets, and saves driver
global, per-lun instance attributes
or attributes for a set of devices bound to the driver.CommandsThe user can explicitly send the following
plug-in by specifying the
clear_stat Clears statistics.get_attr Displays information on attributes.get_info Displays status and other information.get_stat Displays statistics.save_attr Saves value of attributes in a persistent store.set_attr Set current values of attributes.Note:
for the syntax of the above commands.However, the only instance when it is necessary to explicitly send a command
to the plug-in is when performing operations on objects global to
global statistics, attributes or status information.
In all the other cases,
automatically invokes the plug-in
to perform the driver specific part of the operation, when the operation
applies to LUNs bound to driver
or to their LUN paths.AttributesThe following table lists driver
specific attributes.
Also, under
the category "Device Set",
the attributes the
driver can
including, device type, vendor identifier,
product identifier and product revision.
On the concept of attribute and attribute scope, refer to
scsimgr(1M).Note:
The following conventions are used :
RO is Read Only.RW is Read Write.uint32 is unsigned 32 bit integer.Range of values for applicable attributes is listed.I/O Load Balancing PolicyThe I/O load balancing policy attribute,
load_bal_policy,
is a tunable that controls how I/Os
are distributed across the paths to a LUN:
round_robin Paths are selected in a round robin manner.
This is more appropriate when all the paths to the device have similar
I/O turn-around characteristics.least_cmd_load The LUN path with the least number of active I/O requests is selected to
execute the next I/O.
This policy is appropriate when the paths to the LUN exhibit asymmetric
latency characteristics.
The load is distributed to optimize the bandwidth on each LUN path.cl_round_robin (cell aware round robin)This load balancing policy is applicable to HP cell-based platforms.
The LUN paths are selected in a round robin manner within the locality
of CPU on which the I/O was initiated, to ensure that memory access
latencies are optimized.preferred_pathThe I/O path set in the preferred_path attribute is preferrably used for
I/O transfer.
If this I/O path is not available or if the preferred_path
attribute was not set, any other path is selected
for I/O transfer.
This policy is useful for certain disk arrays, which may
exhibit some performance degradation if I/Os are transferred via several
I/O paths to a LUN simultaneously.EXAMPLESTo display
scsimgr esdisk
plug-in general help and supported commands:
scsimgr -h -d esdisk To get esdisk driver global statistics
scsimgr get_stat -d esdisk To clear esdisk driver global statistics
scsimgr clear_stat -d esdisk To get esdisk driver global status information
scsimgr get_info -d esdisk To display information about esdisk driver global attributes
scsimgr get_attr -d esdisk To set the load balancing policy for disk0 to preferred_path
and set the I/O path to be used preferably
scsimgr set_attr -D /dev/rdisk/disk0
-a load_bal_policy=preferred_path
-a preferred_path=0/3/1/0.0x72eb.0x0 To add a settable attribute scope corresponding to all disk devices from
HP with product identifier "MSA VOLUME", for allowing
modification of some settable attribute at this scope
scsimgr ddr_add -N "/escsi/esdisk/0x0/HP /MSA VOLUME
" To persistently change the default I/O load balancing policy, I/O timeout,
and maximum concurrent I/O
for all disk devices from
HP with product identifier "MSA VOLUME"
scsimgr save_attr -N "/escsi/esdisk/0x0/HP
/MSA VOLUME
-a load_bal_policy=least_cmd_load -a esd_secs=60
-a path_fail_secs=60 To disable write cache, Persistent Reservation and 16 bytes read/write CDB
for all disk devices bound to the
scsimgr set_attr -N /escsi/esdisk -a disable_flags='WCE PR RW16' AUTHORSCSI class driver
plug-in for
was developed by
Hewlett Packard Company.SEE ALSO,
Hewlett-Packard Development Company, L.P.希捷 ES.2 这硬盘怎么样？？？_百度知道
希捷 ES.2 这硬盘怎么样？？？
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我有更好的答案
呵呵 说ES2啊 始网吧用 2读2写 带<img class="word-replace" src="/api/getdecpic?picenc=0a006c655f台 双千兆网卡 SUPERCACHE 使用候经现问题 写盘运行间 速度突降10M 换主板 内存 于事补 联系ST客服 说ICH9R与硬盘兼容性问题 付附件SN05 AN05 解决问题现我用ES2 改用RE3 2读2写60台
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不过我的是250G的两块做读阵列.很好用.速度很好.感觉用ES2这个盘做写不好.
不一定 也有没问题的 论坛上也有好多关于ES2硬盘的问题的
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