search for: iostat

on Solaris 10 5.10 Generic_118822-23 sun4v sparc SUNW,Sun-Fire-T200 I run #iostat -xn 5 to monitor the IO statistics on SF T2000 server. The system also have a heavy IO load, for some reason iostat donot refresh (no any update). It seems like iostat is calling pause() and stucked there. Also my HBA driver''s interrupt stack trace indicates there is a lot of swtch(), t...

Hello, We are planning to moving most of our servers to ESX but before buying our SAN, we want to do some I/O stats to see if iSCSI is enough or if we have to go with FC. So I found a plugin for Nagios that can log I/O stats with iostat. So far it's fine with single disk/one partition servers, but on our Oracle Database 10g server, we have two drives in RAID 1 (/dev/sda) and 4 other drives in RAID 10 (/dev/sdb). When I query iostat, I get : [root at golgoth ~]# iostat Linux 2.6.9-55.ELsmp (golgoth.acaiq-ctb.lan) 09/21/...

I''m trying to write a SLAMD (http://www.slamd.com/) resource monitor that can be used to measure the I/O throughput on a ZFS pool, and in particular to be able to get the read and write rates. In order to do this, I''m basically executing "zpool iostat {interval}" and parsing the output to capture the values in the "bandwidth read" and "bandwidth write" columns. I have other resource monitors that are able to capture things like CPU utilization and network traffic, as well as one to measure disk utilization using the sta...

Author: petede Repository: /hg/zfs-crypto/gate Revision: ef5d30f0abff39691966b9805b895f3c757b5a9f Log message: 6269165 misleading comments in usr/src/cmd/stat/iostat/iostat.c 6286482 remove the only occurrence of "shit" in OpenSolaris 6231501 Typo in <sys/fem.h> Contributed by Shawn Walker <binarycrusader at gmail.com>. Files: update: usr/src/cmd/stat/iostat/iostat.c update: usr/src/cmd/volmgt/vold/dev_rmscsi.c update: usr/src/uts/comm...

Hi All, I am learning iostat command to understand disk I/O statistics. We have 2 Centos 4 servers running where oracle is installed.We installed them 2 weeks ago. @ that time, These Servers performed well. But, Now We have come to know that these 2 Machines are quite slow when comparing to the first week. So, Some say, run...

Hi gurus, I like zpool iostat and I like system monitoring, so I setup a script within sma to let me get the zpool iostat figures through snmp. The problem is that as zpool iostat is only run once for each snmp query, it always reports a static set of figures, like so: root at exodus:snmp # zpool iostat -v c...

What is the best way to tell if your bound by the number of individual operations per second / random io? "zpool iostat" has an "operations" column but this doesn''t really tell me if my disks are saturated. Traditional "iostat" doesn''t seem to be the greatest place to look when utilizing zfs. Thanks, Chris -------------- next part -------------- An HTML attachment was scru...

Is there anyway to tell with top or iostat which process is hogging all the disk I/O? Matt

Does "bwlimit" option really work on rsync locally? We have one type of harddisk and want to slow down rsync I/O on disk because I don't want the disk head gets too hot. While I'm trying to use --bwlimit option, it looks the rsync speed was slowed down, but iostat is not improved at all. In both case the block written speed is increased by the same amount. How could I really slow down I/O while using rsync? Any help would be greatly appreciated. Regards, - Reeve rsync without --bwlimit: > iostat; rsync -a -r --stats swapfile swapfile.rsync; iostat Dev...

Hey guys, I need to use iostat to diagnose a disk latency problem we think we may be having. So if I have this disk partition: [root at uszmpdblp010la mysql]# df -h /mysql Filesystem Size Used Avail Use% Mounted on /dev/mapper/MysqlVG-MysqlVol 9.9G 1.1G 8.4G 11% /mysql And I want to cor...

...ks with 2 SSDs configured as a zil log device. I''m using the Areca raid controller, the driver being arcmsr. Quad core AMD with 16 gig of RAM OpenSolaris upgraded to snv_134. The zpool has 2 11-disk raidz2''s and I''m getting anywhere between 1MB/sec to 40MB/sec with zpool iostat. On average, though it''s more like 5MB/sec if I watch while I''m actively doing some r/w. I know that I should be getting better performance. I''m new to OpenSolaris, but I''ve been using *nix systems for a long time, so if there''s any more information tha...

Here is a sample of running iostat on a server that has a LUN from a SAN with multiple paths. I am specifying a device list that just grabs the bits related to the multi path device: $ iostat -dxkt 1 2 sdf sdg sdh sdi dm-7 dm-8 dm-9 Linux 2.6.18-371.8.1.el5 (db21b.den.sans.org) 06/20/2014 Time: 02:30:23 PM Device: rrqm/s...

I updated an i386 system to b39 yesterday, and noticed this when running iostat: r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 0.5 0.0 10.0 0.0 0.0 0.0 0.5 0 0 c0t0d0 0.0 0.5 0.0 10.0 0.0 0.0 0.0 0.6 0 0 c0t1d0 0.0 65.1 0.0 119640001.5 0.0 0.0 0.0 0.3 0 2 c0t2d0 0.0 65.1 0....

I would like zpool iostat to take a "-p" option to output parsable statistics with absolute counters/figures that for example could be fed to MRTG, RRD, et al. The "zpool iostat [-v] POOL 60 [N]" is great for humans but not very api-friendly; N=2 is a bit overkill and unreliable. Is this info available i...

Hi Experts, How can I get info for my disks on multipath disks? I mean, usually I use 'iostat' for internal disks, however I need to know status of my multipathig devices, cause I'm monitoring stress test for my application.. Thank you for your responses. Regards, -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/c...

...ZFSland, Is there any significance in the fact that the bandwidth/read figures for a simple cpio into a ZFS filesystem should be multiples of 21.3K (when non-zero) as follows? What could determine this figure? Do I need to read a manpage? ;-) Thanks... Sean. ----- [root at global:/36g2] # zpool iostat 3 capacity operations bandwidth pool used avail read write read write ---------- ----- ----- ----- ----- ----- ----- pool1 117M 8.26G 0 1 696 74.6K pool1 117M 8.26G 0 0 0 0 pool1 117M 8.26G 0...

Hi, I'm a newbie to tool 'iostat' and I've read the manual for iostat several times. But it doesn't help. I still get confused with the output of 'iostat', the manual seems too abstract, or high-level, for me. Let's post the output first: avg-cpu: %user %nice %sys %idle 5.70 0.00...

Hello zfs-discuss, S10U4+patches, SPARC If I attach a disk to vdev in a pool to get mirrored configuration then during resilver zpool iostat 1 will report only reads being done from pool and basically no writes. If I do zpool iostat -v 1 then I can see it is writing to new device however on a pool and mirror/vdev level it is still reporting only reads. If during resilvering reads are reported shouldn''t it be te same fo...

I really need to take a longer look here. /* * zpool iostat [-v] [pool] ... [interval [count]] * * -v Display statistics for individual vdevs * * This command can be tricky because we want to be able to deal with pool . . . I think I may need to deal with a raw option here ? /* * Enter the main iostat loop. */...

Following is the output of "zpool iostat -v". My question is regarding the datapool row and the raidz2 row statistics. The datapool row statistic "write bandwidth" is 381 which I assume takes into account all the disks - although it doesn''t look like it''s an average. The raidz2 row static "write bandw...