All,
I am attempting to help tune a Sun for better performance (mainly for SAS 9.1), and have found indicators pointing to poor I/O utilization. I have run iostat -cx, and found one device in particular where the %w is in the 90's during processing. I have a feeling that this is where the SAS... (3 Replies)
I'm search for a disk exerciser / load tool like iometer, iozone, diskx for IBM AIX 5.2 and 5.3
Because of a very bad disk performance on several AIX systems, I need to have a tool which is able to generate a disk load on my local and SAN disks.
Does somebody knows a kind of tool which is... (5 Replies)
Friends.
I have to compare iostat -x output with a tool on solaris. Now there is column called wait in the output field which is showing zero. Now, in order to create some load on my system this is what i am doing
I am creating a file using dd command , the size of which is... (5 Replies)
Hello,
On Solaris 10, iostat -E gives me the following results:
sd1 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: FUJITSU Product: MAY2073RCSUN72G Revision: 0501 Serial No: 0708S08M2L
Size: 73.40GB <73400057856 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0... (1 Reply)
Hi, can anyone please suggest a tool to dump i/o packets just like tcpdump does for network traffic. Basically I have a complex dataflow that needs to be optimized and I want to see how packets go to/from disk - what goes randomly and sequentially.
Thanks (8 Replies)
A find for the "iostat" command on a redhat 5 update 4 comes back with no results.
Any separate rpm needs to be installed to get the binary for this ?
Thanks in advance. (1 Reply)
Writing a Tool to simulate non-sequential disk I/O (simulate db file sequential read) in C POSIX
I have over the years come across the same issue a couple of times, and it normally is that the read speed on SAN is absolutely atrocious when doing non-sequential I/O to the disks. Problem being of... (7 Replies)
Hello everyone,
Can you please explain me what kind of information do IOSTAT show ?
iostat -xnz 3 show me those informations:
The I/O of the c0t0d0 disk is normal ?
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 ... (3 Replies)
Hello, I support Oracle 11g on AIX 7.1.
Using the command
$iostat -D hdisk2 hdisk4 hdisk5 5
I get the following output:
hdisk5 xfer: %tm_act bps tps bread bwrtn
44.0 1.4M 178.2 1.4M 14.7K
read: ... (3 Replies)
Hi Everyone,
I try to calculate the total hard disk space of a solaris machine using iostat -En command. Iterating the output and summing up all the number present near the Size: will give the exact size of the harddisk. But it is not working for a machine.
This command works in many flavors... (2 Replies)
Discussion started by: prasankn
2 Replies
LEARN ABOUT LINUX
metaclear
metaclear(1M) System Administration Commands metaclear(1M)NAME
metaclear - delete active metadevices and hot spare pools
SYNOPSIS
/usr/sbin/metaclear -h
/usr/sbin/metaclear [-s setname] -a [-f]
/usr/sbin/metaclear component
/usr/sbin/metaclear [-s setname] [-f] metadevice... hot_spare_pool...
/usr/sbin/metaclear [-s setname] -r [-f] metadevice... hot_spare_pool...
/usr/sbin/metaclear [-s setname] -p component
/usr/sbin/metaclear [-s setname] -p metadevice
DESCRIPTION
The metaclear command deletes the specified metadevice or hot_spare_pool., or purges all soft partitions from the designated component.
Once a metadevice or hot spare pool is deleted, it must be re-created using metainit before it can be used again.
Any metadevice currently in use (open) cannot be deleted.
OPTIONS
Root privileges are required for all of the following options except -h.
-a Deletes all metadevices and configured hot spare pools in the set named by -s, or the local set by default.
-f Deletes (forcibly) a metadevice that contains a subcomponent in an error state.
-h Displays usage message.
-p Deletes (purges) all soft partitions from the specified metadevice or component.
-r Recursively deletes specified metadevices and hot spare pools, but does not delete metadevices on which others
depend.
-s setname Specifies the name of the diskset on which metaclear will work. Using the -s option causes the command to perform
its administrative function within the specified diskset. Without this option, the command performs its function on
local metadevices and/or hot spare pools.
OPERANDS
metadevice ... Specifies the name(s) of the metadevice(s) to be deleted.
component Specifies the c*d*t*s* name(s) of the components containing soft partitions to be deleted.
hot_spare_pool ... Specifies the name(s) of the hot spare pools to be deleted in the form hspnnn, where nnn is a number in the range
000-999.
EXAMPLES
Example 1: Deleting Various Devices
The following example deletes a metadevice named d10.
# metaclear /dev/md/dsk/d10
The following example deletes all local metadevices and hot spare pools on the system.
# metaclear -a
The following example deletes a mirror, d20, with an submirror in an error state.
# metaclear -f d20
The following example deletes a hot spare pool, hsp001.
# metaclear hsp001
The following example deletes a soft partition, d23.
# metaclear d23
The following example purges all soft partitions on the slice c2t3d5s2 if those partitions are not being used by other metadevices or are
not open.
# metaclear -p c2t3d5s2
The following example purges soft partitions from a metadevice.
# metaclear -p d2
d3: Soft Partition is cleared
d4: Soft Partition is cleared
d5: Soft Partition is cleared
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWmdu |
+-----------------------------+-----------------------------+
SEE ALSO mdmonitord(1M), metadb(1M), metadetach(1M), metahs(1M), metainit(1M), metaoffline(1M), metaonline(1M), metaparam(1M), metarecover(1M),
metarename(1M), metareplace(1M), metaroot(1M), metaset(1M), metassist(1M), metastat(1M), metasync(1M), metattach(1M), md.tab(4), md.cf(4),
mddb.cf(4), md.tab(4), attributes(5), md(7D)
Solaris Volume Manager Administration Guide
SunOS 5.10 8 Aug 2003 metaclear(1M)