search for: svc_t

...at my IO rate also seesawed up and down between 31MB/s and 28MB/s, over a 5 second interval... I was not expecting that... Thoughts? Thanks! :) Nathan. Here is the iostat example - extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b cmdk0 0.0 201.5 0.0 23908.7 33.0 2.0 173.5 100 100 nfs2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b cmdk0 0.0 200.0 0.0 24...

Hi, I''m running Opensolaris 2009.06, and I''m facing a serious performance loss with ZFS ! It''s a raidz1 pool, made of 4 x 1TB SATA disks : zfs_raid ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c7t2d0 ONLINE 0 0 0 c7t3d0 ONLINE 0 0 0 c7t4d0 ONLINE 0 0

...t on devices sd15 and sd16 never are answered. I tried this with both no-cache-flush enabled and off, with negligible difference. Is there anyway to force a better balance of reads/writes during heavy writes? extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b fd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 sd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 sd1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 sd2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 sd3 0.0 0.0 0.0 0.0 0.0 0.0 0.0...

Hi all, just after sending a message to sunmanagers I realized that my question should rather have gone here. So sunmanagers please excus ethe double post: I have inherited a X4140 (8 SAS slots) and have just setup the system with Solaris 10 09. I first setup the system on a mirrored pool over the first two disks pool: rpool state: ONLINE scrub: none requested config: NAME

We have a zpool made of 4 512g iscsi luns located on a network appliance. We are seeing poor read performance from the zfs pool. The release of solaris we are using is: Solaris 10 10/09 s10s_u8wos_08a SPARC The server itself is a T2000 I was wondering how we can tell if the zfs_vdev_max_pending setting is impeding read performance of the zfs pool? (The pool consists of lots of small files).

fun example that shows NCQ lowers wait and %w, but doesn''t have much impact on final speed. [scrubbing, devs reordered for clarity] extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b sd2 454.7 0.0 47168.0 0.0 0.0 5.7 12.6 0 74 sd4 440.7 0.0 45825.9 0.0 0.0 5.5 12.4 0 78 sd6 445.7 0.0 46239.2 0.0 0.0 6.6 14.7 0 79 sd7 452.7 0.0 46850.7 0.0 0.0 6.0 13.3 0 79 sd8 460.7 0.0 46947.7 0.0 0.0 5.5...

Under Solaris 10 u6 , No matter how I configured my ARECA 1261ML Raid card I got errors on all drives that result from SCSI timeout errors. yoda:~ # tail -f /var/adm/messages Jan 9 11:03:47 yoda.asc.edu scsi: [ID 107833 kern.notice] Requested Block: 239683776 Error Block: 239683776 Jan 9 11:03:47 yoda.asc.edu scsi: [ID 107833 kern.notice] Vendor: Seagate

...0 When using the 64KB record length, the service times are terrible. At first I thought that my drive array must be broken but now it seems like a change in the ZFS caching behavior (i.e. caching gone!): extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b sd0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 sd1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 sd2 1.3 0.3 6.8 2.0 0.0 0.0 1.7 0 0 sd10 0.0 99.3 0.0 12698.3 0.0 32.2 324.5 0 97 sd11 0.3 105.9 38.4 12753.3 0.0 31.8 299...

...7.97M X25E 59.8M 29.7G 0 588 0 10.3M Still a lot of of the same errors on the console though (more often actually...) Output from iostat -zx 10 if it is of interest: extended device statistics device r/s w/s kr/s kw/s wait actv svc_t %w %b sd32 0.0 718.7 0.0 1437.4 0.0 0.0 0.0 0 3 sd32 0.0 401.1 0.0 6089.1 0.0 0.8 2.1 0 43 sd32 0.0 1187.5 0.0 12341.7 0.0 0.7 0.6 2 37 sd32 0.0 758.2 0.0 14835.1 0.0 1.7 2.3 4 66 sd32 0.0 403.1 0.0 4606.8 0.0 1.5...

[Cross-posting to ldoms-discuss] We are occasionally seeing massive time-to-completions for I/O requests on ZFS file systems on a Sun T5220 attached to a Sun StorageTek 2540 and a Sun J4200, and using a SSD drive as a ZIL device. Primary access to this system is via NFS, and with NFS COMMITs blocking until the request has been sent to disk, performance has been deplorable. The NFS server is a

I've been playing around with snapshots lately but I've got a problem on one of my servers running 7-STABLE amd64: FreeBSD paladin 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #8: Mon Nov 10 20:49:51 GMT 2008 tdb@paladin:/usr/obj/usr/src/sys/PALADIN amd64 I run the mksnap_ffs command to take the snapshot and some time later the system completely freezes up: paladin# cd /u2/.snap/ paladin#

G''day, all, So, I''ve decided to migrate my home server from Linux+swRAID+LVM to Solaris+ZFS, because it seems to hold much better promise for data integrity, which is my primary concern. However, naturally, I decided to do some benchmarks in the process, and I don''t understand why the results are what they are. I though I had a reasonable understanding of ZFS, but now