search for: friesenhahn

...rive array indicates a an average IOPS of 214 for one drive even though the peak write speed is only 26MB/second (peak read is 42MB/second). Can someone share with me what they think the write bottleneck might be and how I can surmount it? Thanks, Bob ====================================== Bob Friesenhahn bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ % zpool status pool: Sun_2540 state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSU...

...h network traffic (1500 packets/second), and the affected OS-X system would operate more strangely than normal. The simple solution was to simply create a "/home/.DS_Store" directory on the server so that the mount request would succeed. Bob ====================================== Bob Friesenhahn bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/

http://hardware.slashdot.org/story/09/06/09/2336223/Apple-Removes-Nearly-All-Reference-To-ZFS

If there were a ?zfs send? datastream saved someplace, is there a way to verify the integrity of that datastream without doing a ?zfs receive? and occupying all that disk space? I am aware that ?zfs send? is not a backup solution, due to vulnerability of even a single bit error, and lack of granularity, and other reasons. However ... There is an attraction to ?zfs send? as an augmentation to the

Interesting flash technology overview and SSD review here: http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3403 and another review here: http://www.tomshardware.com/reviews/Intel-x25-m-SSD,2012.html Regards, -- Al Hopper Logical Approach Inc,Plano,TX al at logical-approach.com Voice: 972.379.2133 Timezone: US CDT OpenSolaris Governing Board (OGB) Member - Apr 2005

Hi all Is it possible to securely delete a file from a zfs dataset/zpool once it''s been snapshotted, meaning "delete (and perhaps overwrite) all copies of this file"? Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 roy at karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et element?rt imperativ

----- Forwarded message from Bob Friesenhahn <bfriesen at simple.dallas.tx.us> ----- From: Bob Friesenhahn <bfriesen at simple.dallas.tx.us> Date: Mon, 23 Jul 2012 12:55:44 -0500 (CDT) To: zfs at lists.illumos.org cc: Radio m?odych bandyt?w <radiomlodychbandytow at o2.pl>, Pawel Jakub Dawidek <pjd at FreeBSD.org>, de...

Hello! I''am setup zfs / cifs home storage server, end now have low performance with play movie stored on this zfs from windows client. server hardware is not new , but n windows it perfomance was normal. CPU is AMD Athlon Burton Thunderbird 2500, runing on 1,7GHz, 1024 RAM and storage: usb c4t0d0 ST332062-0A-3.AA-298.09GB /pci at 0,0/pci1458,5004 at 2,2/cdrom at 1/disk at

....sun.com/app/docs/doc/819-5461/ggpdm?a=view recommends that this process should be used. The two documents do not seem to agree. Given that my system is essentially equivalent to U8, is there any reason to live upgrade to UFS U8 prior to ZFS U8 or can the more direct path be used? Bob -- Bob Friesenhahn bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/

I'm using read.csv to read in a csv file containing '#' characters. For example, say I'm reading the following file (test.csv): var1,var2,var3 a,b,c d,e#,f g,h,i It outputs: > read.csv("Raw Data\\test.csv") var1 var2 var3 1 a b c 2 d e 3 g h i Warning message: incomplete final line found by readTableHeader on 'Raw Data\test.csv'

Hi All, I am looking at ZFS and I get that they call it RAIDZ which is similar to RAID 5, but what about RAID 10? Isn''t a RAID 10 setup better for data protection? So if I have 8 x 1.5tb drives, wouldn''t I: - mirror drive 1 and 5 - mirror drive 2 and 6 - mirror drive 3 and 7 - mirror drive 4 and 8 Then stripe 1,2,3,4 Then stripe 5,6,7,8 How does one do this with ZFS?

My understanding is that if I "zfs set checksum=<different>" to change the algorithm that this will change the checksum algorithm for all FUTURE data blocks written, but does not in any way change the checksum for previously written data blocks. I need to corroborate this understanding. Could someone please point me to a document that states this? I have searched and searched

Hi, I just installed 2009.06 and found that compression isn''t enabled by default when filesystems are created. Does is make sense to have an RFE open for this? (I''ll open one tonight if need be.) We keep telling people to turn on compression. Are there any situations where turning on compression doesn''t make sense, like rpool/swap? what about rpool/dump? Thanks, ~~sa

An interesting thing I just noticed here testing out some Firewire drives with OpenSolaris. Setup : OpenSolaris 2009.06 and a dev version (snv_129) 2 500Gb Firewire 400 drives with integrated hubs for daisy-chaining (net: 4 devices on the chain) - one SATA bridge - one PATA bridge Created a zpool with both drives as simple vdevs Started a zfs send/recv to backup a local filesystem Watching

Hi, I don''t know if it''s already been discussed here, but while thinking about using the OCZ Vertex 2 Pro SSD (which according to spec page has supercaps built in) as a shared slog and L2ARC device it stroke me that this might not be a such a good idea. Because this SSD is MLC based, write cycles are an issue here, though I can''t find any number in their spec. Why do I

I''ve got a server that freezes when I run a zpool scrub from cron. Zpool scrub runs fine from the command line, no errors. The freeze happens within 30 seconds of the zpool scrub happening. The one core dump I succeeded in taking showed an arccache eating up all the ram. The server''s running Solaris 10 u3, kernel patch 127727-11 but it''s been patched and seems to have

I''m looking for a way to backup my entire system, the rpool zfs pool to an external HDD so that it can be recovered in full if the internal HDD fails. Previously with Solaris 10 using UFS I would use ufsdump and ufsrestore, which worked so well, I was very confident with it. Now ZFS doesn''t have an exact replacement of this so I need to find a best practice to replace it.

...so it is unlikely that the firmware tweak will work. A CAM cache feature that I tweaked (to disable write mirring across controllers) is no longer present. Does anyone have advice as to how the performance may be improved with smaller block writes on huge files? Should I even care? Bob -- Bob Friesenhahn bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/

Hello, We have a new Thor here with 24TB of disk in (first of many, hopefully). We are trying to determine the bext practices with respect to file system management and sizing. Previously, we have tried to keep each file system to a max size of 500GB to make sure we could fit it all on a single tape, and to minimise restore times and impact should we experience some kind of volume

Hi, Please forgive me if my searching-fu has failed me in this case, but I''ve been unable to find any information on how people are going about monitoring and alerting regarding memory usage on Solaris hosts using ZFS. The problem is not that the ZFS ARC is using up the memory, but that the script Nagios is using to check memory usage simply sees, say 96% RAM used, and alerts. The