similar to: slog tests on read throughput exhaustion (NFS)

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

Today I updated the firmware on my StorageTek 2540 to the latest recommended version and am seeing radically difference performance when testing with iozone than I did in February of 2008. I am using Solaris 10 U5 with all the latest patches. This is the performance achieved (on a 32GB file) in February last year: KB reclen write rewrite read reread 33554432

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

I have just recently (physically) moved a system with 16 hard drives (for the array) and 1 OS drive; and in doing so, I needed to pull out the 16 drives so that it would be light enough for me to lift. When I plugged the drives back in, initially, it went into a panic-reboot loop. After doing some digging, I deleted the file /etc/zfs/zpool.cache. When I try to import the pool using the zpool

Hey all, I''m not sure if this is a ZFS bug or a hardware issue I''m having - any pointers would be great! Following contents include: - high-level info about my system - my first thought to debugging this - stack trace - format output - zpool status output - dmesg output High-Level Info About My System --------------------------------------------- - fresh

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

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

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

I am needing to create a new identifier variable for a data set which has no ID variable in the original file. I am basically wanting to take the count of each row and add "sd" in front of it - so it would look like so sd1 sd2 sd3 sd4 sd5 etc....... I have no idea how to do this. I am a SAS user trying to learn R. This question may have been answered previously, but I could be

Hello everyone, As one of the steps of improving my ZFS home fileserver (snv_134) I wanted to replace a 1TB disk with a newer one of the same vendor/model/size because this new one has 64MB cache vs. 16MB in the previous one. The removed disk will be use for backups, so I thought it''s better off to have a 64MB cache disk in the on-line pool than in the backup set sitting off-line all

Hi, I upgraded to Ruby 1.8.4 and whatever the latest Rails is as of March 29 2006. I am using PostgreSQL 7.4. With the earlier version of rails, I had insert queries that looked like this: Topic Create (0.001189) INSERT INTO topics ("inlibrary", "irx_display_title", "irx_title", "title", "creation_stamp", "last_update_stamp",

Not sure where to put this but I am cc''ing the ZFS - discussion board. I was successfull in creating iscsi shares using ZFS set shareiscsi=on with 2 thin provisioned partitions of 1TB each (zfs create -s -V 1tb idrive/d1). Access to the shares with an iscsi initiator was successful, all was smooth, until the reboot. Upon reboot, the console reports the following errors. WARNING:

Hi All, I''ve just built an 8 disk zfs storage box, and I''m in the testing phase before I put it into production. I''ve run into some unusual results, and I was hoping the community could offer some suggestions. I''ve bascially made the switch to Solaris on the promises of ZFS alone (yes I''m that excited about it!), so naturally I''m looking

I upgraded my Centos 4.7 server last night. Switched from a cheaper 50$ asus motherboard to a Supermicro motherboard. I also, using dd, copied entire 500g SATA seagate drive to new 500g SATA seagate drive so as to have two copies in case something went wrong. Anyway, now I keep getting this error: Nov 21 06:08:33 server kernel: hda: status timeout: status=0xd0 { Busy } Nov 21 06:08:33 server

I have some code that generates the following log entries (annotated with #). The code takes place inside a transaction. A record is inserted. Then I get the of the newly inserted record, then I explicitly select that record (this is just to illustrate the problem). Then another insert is attempted and fails because of a constraint that requires one of the values entered to be an existing

After having massive problems with a supermicro X7DBE box using AOC-SAT2-MV8 Marvell controllers and opensolaris snv79 (same as described here: http://sunsolve.sun.com/search/document.do?assetkey=1-66-233341-1) we just start over using new hardware and opensolaris 2008.05 upgraded to snv94. We used again a supermicro X7DBE but now with two LSI SAS3081E SAS controllers. And guess what? Now we get

Hey all - Was playing a little with zfs today and noticed that when I was untarring a 2.5gb archive both from and onto the same spindle in my laptop, I noticed that the bytes red and written over time was seesawing between approximately 23MB/s and 0MB/s. It seemed like we read and read and read till we were all full up, then wrote until we were empty, and so the cycle went. Now: as it happens,

[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

Dear R helpers I have following data stocks <- c("ABC", "DEF", "GHI", "JKL") prices_df <- data.frame(ABC = c(17,24,15,22,16,22,17,22,15,19),                                          DEF = c(22,28,20,20,28,26,29,18,24,21),                                           GHI = c(32,27,32,36,37,37,34,23,25,32),                                          

Hi, I have installed b_78 on a Dell 2950 and booting to bare metal works fine but when I try to boot using the grub entry Solaris xVM it will boot to the point where it displays the uname info and then just stays there. It will not boot past that point. I have enabled VT technology in the BIOS (but only after the installation). Where/what can I look at to trouble shoot this? I am new to xen and