similar to: Disk errors

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, 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, I have a doubt on how the transaction semantics work in ext3. When I copy a file, does the entire copy is treated as one transaction so that finally I have either the full file or no file. Or will it be split into multiple transactions which can result in copying partial files. thanks, Vijayan

When trying to build ext3 as a module, I get the follwing errors during the kernel link: /usr/bin/kgcc -D__KERNEL__ -I/home/brian/src/kernel-2.2.19-pre6mvd/linux-2.2.19pre6-kdb-ext3/include -c -o dummy_sym.o dummy_sym.c ld -m elf_i386 -T /home/brian/src/kernel-2.2.19-pre6mvd/linux-2.2.19pre6-kdb-ext3/arch/i386/vmlinux.lds -e stext arch/i386/kernel/head.o arch/i386/kernel/init_t ask.o -Map map

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 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

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

I've got a filesystem-based JBOD setup. During testing, I failed out one of the drives and tried to access the filesystem on it. Here are the results I got: stat /disk succeeds open /disk for reading succeeds readdir (getdents) for /disk fails EIO open /disk/noexist for reading fails ENOENT open /disk/noexist for writing

Hi, with being exposed to more and more failed hard disks reports, I've accumulated several questions of the logged messages in /var/log/messages file: like how to identifying failed disks(partitions), where is the exact failed sector(s) on the hard disk, and why badblocks reports OK to the reported disk failure. Let me explained the above with the following several example. scenario #1, a

Under xen, either stock xen-2.0.1+linux-2.6.9 or Fedora''s latest (2.6.10-1.1109_FC4), drdb (<http://www.drbd.org/>),as soon as I try to write to one of its devices, causes "Badness" in the kernel and, ultimately, a spontaneous reboot. Under non-xen 2.6.10-1.1109_FC4 and 2.6.9-1.678_FC3, drbd works fine. The error: Jan 25 21:01:23 turing kernel: Badness in blk_plug_device

Regardless of the filesystem (i''ve used reiserfs, xfs, ext3), whenever I mount a fresh DRBD partition I get some nasty kernel messages. This is under Debian Sarge, Xen kernel 2.6.11.12-xen0 (dom0) using DRBD v0.7.11 (pulled from Debian "testing"). This is what I did to create the partition. On both nodes I created a new LVM storage device and started DRBD: # lvcreate

Hi, I ran a set of benchmarks over different combinations of ext3 journaling on mirrored disks. I got some non-intuitive results. Could someone help me reason this ? Benchmarks ---------- I ran concurrently 4 processes, each process having a working set of 10MB. a) Process 0 creates 160 files each of size 64KB. b) Process 1 reads 160 files each of size 64KB. c) Process 2 creates 2560 dirs.

Dear R Group I was trying to use the triangle.test function in SensoMineR and strangely i encounter a error in the output of preference matrix from the analysis. To illustrate, pl see the following dataframe of a design with the response and preference collected as shown below: design<-structure(list(`Product X` = c(3, 1, 4, 2, 4, 2, 1, 3, 4, 2, 4, 2, 1, 3, 4, 2, 4, 2, 3, 1), `Product Y` =

[Just a gentle reminder that the deadline is only one week away] ======================================================================== Call for Papers 7th IEEE International Workshop on Storage Network Architecture and Parallel I/Os (SNAPI 2011) http://snapi2011.cis.fiu.edu

[Just a gentle reminder that the deadline is only one week away] ======================================================================== Call for Papers 7th IEEE International Workshop on Storage Network Architecture and Parallel I/Os (SNAPI 2011) http://snapi2011.cis.fiu.edu

Hello. I found bugs on error handlings in the functions arround the ext3 file system, which cause inadequate completions of synchronous write I/O operations when disk I/O failures occur. Both 2.4 and 2.6 have this problem. I carried out following experiment: 1. Mount a ext3 file system on a SCSI disk with ordered mode. 2. Open a file on the file system with O_SYNC|O_RDWR|O_TRUNC|O_CREAT

Dear R Group in package Deducer, how should i use the add.cross.strata.test() function to pass the chi.squared.test function as htest argument? ##########Example########### library(Deducer) dat<-data.frame(a=rnorm(100)>.5,b=rnorm(100)>0,c=rnorm(100)>(-.5)) tables<-contingency.tables( row.vars=a, col.vars=b, stratum.var=c,data=dat)

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 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 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,.