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Questions tagged [write]

40 questions
30
votes
8 answers

Write speed requirement : 1.1GB/s possibilities?

We will have a machine at work, that on peak performance, should be able to push 50 ("write heads") x 75GB of data per hour. That's peak performance of ~1100MB/s write speed. To get that from the machine, it requires two 10GBi lines. My question is…
SvennD
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7
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3 answers

Can't write to other users "you have write permission turned off"

For some reason I'm not able to write to other users on my system. [root@hostname ~]# write write: you have write permission turned off. [root@hostname ~]# mesg y [root@hostname ~]# mesg is y [root@hostname ~]# write write: you have write permission…
Steve Robbins
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6
votes
2 answers

ZFS Poor Write Performance When Adding More Spindles

I am using ZFS on Linux and am experiencing a rather strange symptom that when I add more disks to the system, the speed at which each drive writes reduces, effectively negating the additional spindles for sequential write performance. The disks are…
user56789
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6
votes
5 answers

vsftpd: refusing to run with writable root inside chroot

I want to setup a anonymous only ftp server (able to upload files). Here is my config…
WoooHaaaa
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4
votes
1 answer

Logging sshfs reads + writes - Possible?

We use sshfs in quite a few situations. We were wondering if there was a way to log the read / writes made to the sshfs mounts we have so we could optimize things on our local side (eg: tweaking cache, locally caching objects, etc). Any ideas?
anonymous-one
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3
votes
1 answer

Write permission on file is NOT granted when used by postfix

I have to change my working platform from Ubuntu to Centos7. My script is working fine on Ubuntu but not yet on Centos. My script is supposed to update the /tmp/CheckAccessRight.log file, when the script is executed manually the "Write…
Fdv
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3
votes
1 answer

write/wall message to users with color

Is it possible to send messages to other users (i.e. via the wall and/or write commands), with colors in the message? I have a shutdown script that kicks other users off of a shared file server, and I want to make the message more obvious to them by…
Cloud
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3
votes
1 answer

Write access on Apache WebDAV server

I have set up a WebDAV server running Arch Linux 3.19.3 and Apache 2.4, according to the Arch Wiki [1] [2] and the Apache Documentation [3]. The only changes I made to /etc/httpd/conf/httpd.conf: LoadModule dav_module modules/mod_dav.so LoadModule…
user275991
3
votes
3 answers

Limit Hard Drive Write Speed by User in Linux

Background: I use a cluster with my coworkers and if anyone writes too many big files at the same time I can't even move the cursor in vim (the horror!). I'm not sure if it is more related to the number of files open or the "bandwith" of hard drive…
sequenceGeek
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3
votes
3 answers

Benefits of a RAID BBU in addition to a double UPS + PS system

Today I roughly measured the benefits of enabling write-back on the RAID controller on a server at work. It got no RAID battery-backup-unit (BBU) so the write-cache is currently disabled. As the server is not used to capacity (by far), the results…
Wikser
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3
votes
2 answers

Disk write latency with and without RAID

I have run 2 tests with different setup as explained below. I'm using Azure VM Standard D64s v3. For the first setup I have mounted 4 Premium SSD disks of 4 TB each, and am performing IO operations with 1 thread writing to each disk. the FIO job…
user3740951
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2
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2 answers

centos7 apache cannot write to a file it owns

I have installed httpd and php on a fresh centos7 and put some files into /var/www/html including an install script I wrote. This script needs to write to a config file in the /var/www/html directory. I created an empty config file and chowned it to…
jpro
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2
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0 answers

Why doesn't NFS4's ID mapping give me write access?

I have installed an NFS server on an Ubuntu server system. The /etc/exports says / 192.168.178.0/24(ro,sync,fsid=0,no_subtree_check,root_squash) /home/bronger 192.168.178.0/24(rw,sync,no_subtree_check,no_root_squash) The…
Torsten Bronger
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2
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1 answer

Turn off write barriers on ext4 whiche FS is mounted

I am doing some IO intensive DB imports that run for several days now and the IO performance has dropped tremendously over times. The DB data files (log files) are on an ext4 formatted logical volume which is mounted with default options (did not…
user462982
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1
vote
0 answers

Hard disk with xfs file system has bad write performance in subfolders

Our server has a raid6 array (10+2 disks, each disk is 6TB/SATA/7200rpm). We plan to make it an NFS storage shared with other clients. However, the writing speed is very slow: [root@Server ~]# mkfs.xfs /dev/sdd1 meta-data=/dev/sdd1 …
xlwang
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