similar to: Transaction semantics in ext3

Hi, I have a doubt in the ordering of writes in ext3. Any help is appreciated. Ext3 enforces certain ordering in writes to ensure data integrity. For example, the journal writes are issued first and only after their successful completion the actual writes are issued. Sometimes we need to maintain ordering across transactions also. This is needed because if the actual writes of one transaction

Hi, I have a question on fsync() and ext3's journaling modes. Assume that I call fsync(fd) on a file. If that file is in 'data=journal' mode, would the fsync() return once the data gets safely into the journal ? On the other hand, if that file is in 'data=writeback' mode, would the fsync() return only when the data gets safely into its actual location ? Any help is

Hi, I'm using linux 2.4.25 and I'm trying to change the wakeup interval of kupdate daemon. Is there a way to change that ? I once used 'update' tool for that. But that is not there in 2.4.25. Has it been removed ? I appreciate any help regarding this. thanks, Vijayan

Hi, Is it possible to use a separate journal device (one on a separate drive or a partition) shared among more than 1 Ext3 file systems ? I appreciate any inputs. thanks, Vijayan

Hi, Is there any way that one can change the location of the journal file when the file system is created ? For eg., instead of using inode# 7 and the blocks at the beginning of the file system, I'd like to use an inode at a different cylinder group and some other set of blocks. Even if I'm allowed only to use one of the reserved inodes, is it possible to put the journal file somewhere in

I'm setting up a new file server and I just can't seem to get the expected performance from ext3. Unfortunately I'm stuck with ext3 due to my use of Lustre. So I'm hoping you dear readers will send me some tips for increasing ext3 performance. The system is using an Areca hardware raid controller with 5 7200RPM SATA disks. The RAID controller has 128MB of cache and the disks

Hello, Does anybody know how to avoid the file fragmentation when a file is created over NFSv3? A file created locally is OK: dd bs=32k if=/dev/zero of=test count=32x1024 conv=fsync filefrag test test: 10 extents found, perfection would be 9 extents When I create the file in the same dir, but from another machine, mounted over NFS: filefrag test test: 4833 extents found, perfection would be

Dear R Group Here is what i am trying to do.. but couldnt figure out how.. string<-"ABC DEFG HIJKLM NOPQ RSTUV WXY" string1<-substr(string,1,4) I want to create an R object string 2 ( following the logic shown).. R does not allow string subtraction.. any suggestions how to achieve this? string2<-string-string1 (it should now hold "DEFG HIJKLM NOPQ RSTUV WXY" I

Hi all, We are building a new system which is going to use ext3 FS. We would like to know more about the behavior of ext3 in the case of failure. But before I procede, I would like to share more information about our future system. * Our application always does an fsync on files * When symbolic links (more specifically fast symlink) are created, the host directory is also fsync'ed. * Our

There was a question in R forum very long time back.. on how to protect R Script files from inadvertent editing by users. There is a way to do this from within R, atleast in Windows XP I have tried this and it certainly works , The method is very different from the OS based folder protection route, however making available such a method in the open forum would only kill the very spirit of R.

Hi I am looking at generating a random dataset of say 100 values fitting in a normal distribution of a given mean and SD, I am aware of rnorm function. However i am trying to build into this function one added constraint that all the random value generated should also obey the constraint that they only take values between say X to X+25 How do i do this in R? Any help would be highly appreciated,.

Hi All ; One of our customer is suffered from FS being corrupted after an unattanded shutdonw due to power problem. They want to switch to ZFS. >From what I read on, ZFS will most probably not be corrupted from the same event. But I am not sure how will Oracle be affected from a sudden power outage when placed over ZFS ? Any comments ? PS: I am aware of UPS''s and

Dear R Group I have a character vector from which I want to select a few elements and create a new character vector. I need a GUI to do this in R Script. Can someone help? a<-c("A","B","C","D","E") ## I want to have a GUI in R that will display elements in "object a" as a drop down list.. from there I want to be able to select a

Forgive me if this has been discussed. I'm new to the list and couldn't find any list archives or a FAQ or anything similiar. (Is there anything?) I've just today installed ext3 .5d in my machine. All drives (including '/'). I like it! However, I'm curious about what it's doing. I don't know C, so telling me to read source won't help. I'm wondering if it

Greetings all, I have a question regarding the fsync data corruption bug that was introduced in 2.4.20 when using data=journal. I have patched the 2.4.20 kernel with the 3 sync patches available from zip.com.au, and I am wondering if with these patches the "bug" still exists: sync_fs.patch sync_fs-fix.patch sync_fs-fix-2.patch In addition the following two patches have also

@Don your solution does not solve Vijayan's scenario 2. I used spread and gather for that. An alternative solution to insert mising Fval - picking up with Don's newtst - is newtst <- c("FName: fname1", "Fval: Fval1.name1", "FName: fname2", "Fval: Fval2.name2", "FName: fname3", "FName: fname4", "Fval: fval4.fname4")

Using Ulrik?s example data (and assuming I understand what is wanted), here is what I would do: ex.dat <- c("FName: fname1", "Fval: Fval1.name1", "Fval: ", "FName: fname2", "Fval: Fval2.name2", "FName: fname3") tst <- data.frame(x = ex.dat, stringsAsFactors=FALSE) sp <- strsplit(tst$x, ':', fixed=TRUE) chk <-

Hi Vijayan, one way going about it *could* be this: library(dplyr) library(tidyr) library(purrr) ex_dat <- c("FName: fname1", "Fval: Fval1.name1", "Fval: ", "FName: fname2", "Fval: Fval2.name2", "FName: fname3") data.frame(x = ex_dat) %>% separate(x, c("F1", "F2"), sep = ": ") %>% filter(F2

Dear R Group Can any body point me to a link from where I can get zip archive of the package HH for R 2.12.0? Thanks & Regards Vijayan Padmanabhan "What is expressed without proof can be denied without proof" - Euclide. Please visit us at www.itcportal.com ****************************************************************************** This Communication is for the exclusive use

Hi! Is there a way to view ext3 filesystem's maintained journal (in a human-readable-format)? I ask, because i have had a server crash before and now i'm wondering if i might take a look at last things that my server did straight before crash. I guess clarifying log insertions might be lost before buffers were flushed to disk. Thx.