similar to: Forensics related ZFS questions

Hello, I have several ~12TB storage servers using Solaris with ZFS. Two of them have recently developed performance issues where the majority of time in an spa_sync() will be spent in the space_map_*() functions. During this time, "zpool iostat" will show 0 writes to disk, while it does hundreds or thousands of small (~3KB) reads each second, presumably reading space map data from

Hi Everyone, I perform a snapshot and a zfs send on a filesystem with a recordsize of 16k, and redirect the output to a plain file. Later, I use cat sentfs | zfs receive otherpool/filesystem. In this case the new filesystem''s recordsize will be the default 128k again. The other filesystem attributes (for example atime) are reverted to defaults too. Okay, I can set these later,

Would it be worthwhile to implement heuristics to auto-tune ''recordsize'', or would that not be worth the effort? -- Regards, Jeremy

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Hi, Created a zpool with 64k recordsize and enabled dedupe on it. zpool create -O recordsize=64k TestPool device1 zfs set dedup=on TestPool I copied files onto this pool over nfs from a windows client. Here is the output of zpool list Prompt:~# zpool list NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT TestPool 696G 19.1G 677G 2% 1.13x ONLINE - When I ran a

A customer has a zpool where their spectral analysis applications create a ton (millions?) of very small files that are typically 1858 bytes in length. They''re using ZFS because UFS consistently runs out of inodes. I''m assuming that ZFS aggregates these little files into recordsize (128K?) blobs for writes. This seems to go reasonably well amazingly enough. Reads are a

Hi All, Is there a way to tune the zfs prefetch on a per pool basis? I have a customer that is seeing slow performance on a pool the contains multiple tablespaces from an Oracle database, looking at the LUNs associated to that pool they are constantly at 80% - 100% busy. Looking at the output from arcstat for the miss % on data, prefetch and metadata we are getting around 5 - 10 % on data,

I'm looking at deploying a new set of servers based around Intel P4 800MHZ FSB processors. Currently I'm looking at the following 2 motherboards and I'm wondering how well supported they are under -STABLE (specificaly the ATA and LAN as well as text mode video) Model Chipset ASUS P4P8X Intel 865P ASUS P4P800 Intel 865PE Also I'm looking for recommendations on Dual Xeon

Hi all, I have a following problem: - Remus network buffering doesn''t work. It seems to be because of no vif is reported by the function server.xend.domain on line 29 of /usr/local/lib/python2.7/dist-packages/xen/remus/vm.py (seen using pdb) : 27 if domid: 28 try: 29 self.dominfo = server.xend.domain(domid, ''all'') >

While setting up my new system, I''m wondering whether I should go with plain directories or use ZFS filesystems for specific stuff. About the cost of ZFS filesystems, I read on some Sun blog in the past about something like 64k kernel memory (or whatever) per active filesystem. What are however the additional costs? The reason I''m considering multiple filesystems is for instance

This is more an Outlook issue than Dovecot, but given that it is connected to Dovecot I figured there would be a good pool of knowledge here that increases the likelihood that somebody knows the answer :) I have a Dovecot server setup with a public folder and keep getting complaints that Outlook users don't see new folders created by other people. In Thunderbird it is simply a case of

I'm running CentOS 7.2 and have the following NUT packages installed: nut.x86_64 2.7.2-3.el7 @epel nut-client.x86_64 2.7.2-3.el7 @epel I have it configured based on the instructions in the following page: https://www.luzem.com/2015/01/25/install-ups-in-centos-7/ and it's working except for

Just spended ~ hour googling - all boards are based on GC-XX or I750X Chipsets - all for Xeons. There also some boards for Pentium 3. Can someone point me to a board with 64Bit 3.3v PCI for ordinary P4 with 800Mhz FSB. Thanks

We have DELL 2650 server and I found recently /var/log/messages have following messages continue pop-up: =========================================== Dec 3 15:47:06 HOST1 kernel: Free pages: 17816kB (1664kB HighMem) Dec 3 15:47:06 HOST1 kernel: Active:7463815 inactive:656000 dirty:0 writeback:0 unstable:0 free:4454 slab:119979 mapped:730440 pagetables:63277 Dec 3 15:47:06 HOST1 kernel:

Is ZFS efficient at handling huge populations of tiny-to-small files - for example, 20 million TIFF images in a collection, each between 5 and 500k in size? I am asking because I could have sworn that I read somewhere that it isn''t, but I can''t find the reference. Thanks, Brian -- - Brian Gupta http://opensolaris.org/os/project/nycosug/

I have a lot of people whispering "zfs" in my virtual ear these days, and at the same time I have an irrational attachment to xfs based entirely on its lack of the 32000 subdirectory limit. I''m not afraid of ext4''s newness, since really a lot of that stuff has been in Lustre for years. So a-benchmarking I went. Results at the bottom:

Hello, Im about to migrate a 6Tb database from Veritas Volume Manager to ZFS, I want to set arc_max parameter so ZFS cant use all my system''s memory, but i dont know how much i should set, do you think 24Gb will be enough for a 6Tb database? obviously the more the better but i cant set too much memory. Have someone implemented succesfully something similar? We ran some test and the

Dear all, I am getting below syslog error on my oracle database server running on RHEL4U5. During this time my swap shows zero on both available and free in the top command output , result in total system hang. can any one guide me how to fix this issue of memory and exactly what this error indicates?? ERROR FROM SYSLOG

Hi all, Recently I build XEN 4.1 (from the xen.org) on centIOS 5.5 (kernel 2.6.38.4). After changing the grub file and rebooting the machine, I am continuously getting out of memory error. The content of my grub file: default=0 timeout=5 serial --unit=0 --speed=115200 terminal --timeout=10 console serial splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.38.4) root

Hi guys, Another strange behavior with some test servers. They are booted using 2.6.11.12, xen-2.0.6, Debian. The only daemons running on dom0 are : xend, smtp, quagga (ospf), portmap (nfs client), sshd. Memory usage at startup is aroung 30 MB. Dom0 reserved memory is 256 MB. The only things that happen on this server are domU''s start/stop (xm create, xm shutdown) and a