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Questions tagged [block]

132 questions
64
votes
7 answers

Government censors HTTPS traffic to our website. Workarounds?

I am helping run a website that has been blocked for political reasons by the same Russian agency that has previously tried blocking Telegram (RosKomNadzor). This is not the first time it happens, and previously we would just change the domain, but…
Mary
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13
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3 answers

Best way to block a country by IP address?

I have a website that needs to block a particular country based on IP address. I am more than aware that IP-based blocking is not a foolproof method for blocking visitors, but it is a necessary step in the right direction. Since I'm using PHP, what…
Nathan Osman
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11
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1 answer

how to do I/O sniffing

For sizing purposes I need to understand what requirements an application has to the I/O subsystem. I would love to do what I call I/O sniffing and obtain a list of events from the block layer like this: initiator XYZ requests block 4711 from device…
Thorsten Staerk
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10
votes
1 answer

Which block sizes for millions of small files

I have 2x 4TB Disks in hardware RAID1 (it might be a LSI MegaRaid) on Debian Wheezy. The physical block size is 4kB. I'm going to store 150-200 million of small files (between 3 and 10kB). I'm not asking for performance, but for best filesystem and…
rabudde
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9
votes
4 answers

root full Linux. No free blocks

df -h reports the '/' partition to be 100% full. While running du -hs * on each directory of this partition shows there is still lot of space. tune2efs which reports just one block to be free. Ran fsck as well, which also shows all blocks being…
Ankit
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8
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2 answers

Choosing file system block size

Considering unix/linux/bsdunix specific file systems: How can I choose/know which block size to use while creating file system? Is there any specific block size value for a particular file system that is considered most efficient for that particular…
Drt
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7
votes
3 answers

EMC VNX iSCSI setup - unsure about SP/port assignment

We have a new VNX5300 waiting to get configured, and I need to plan out the network infrastructure before the EMC tech arrives. It has 4x1gbit iSCSI per SP (8 ports in total), and I'd like to get the most out of the performance until we jump over to…
pauska
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7
votes
4 answers

nginx Block IP based on URI in one 'location'

There is currently a block of one location / location / { root /var/www/docs; proxy_pass http://backend; proxy_buffering on; proxy_buffer_size 64k; proxy_buffers 256 64k; } that needs to be filtered by…
Déjà vu
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7
votes
2 answers

How do I block an IP address or network block with Varnish VCL?

How does one block either IP address of network range inside of Varnish's VCL file?
alexus
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6
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3 answers

How do I unmount one of two devices mounted to the same mount point?

I accidentally left two different devices mounted on /opt: /dev/xvdf on /opt type ext4 (rw,relatime,seclabel,data=ordered) /dev/md0 on /opt type ext4 (rw,relatime,seclabel,stripe=256,data=ordered) It would be a problem to umount /dev/md0, and…
Some Linux Nerd
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6
votes
2 answers

How does ZFS Block Level Deduplication fit with Variable Block Size?

According to The First Google Result for "ZFS Deduplication" ... What to dedup: Files, blocks, or bytes? ... Block-level dedup has somewhat higher overhead than file-level dedup when whole files are duplicated, but unlike file-level dedup, it…
700 Software
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6
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2 answers

Hadoop HDFS: set file block size from commandline?

I need to set the block-size of a file when I load it into HDFS, to some value lower than the cluster block size. For example, if HDFS is using 64mb blocks, I may want a large file to be copied in with 32mb blocks. I've done this before within a…
BigChief
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6
votes
5 answers

Blocking a country (mass iP Ranges), best practice for the actual block

This question has obviously been asked many times in many different forms, but I can't find an actual answer to the specific plan I've got. We run a popular European Commercial deals site, and are getting a large amount of incoming…
kwiksand
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5
votes
4 answers

Blocking EXE from executing in XP Domain environment

I was wondering if anyone could point me in the right direction on how to block specific exe files from executing on XP machines in a domain environment. I have active directory setup and working so that is a possible tool. I know how to block the…
Dan
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5
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4 answers

How to block completely Windows Update on my network

I know it is not safe but I need to know how to prevent all computers in my LAN to download updates. I have squid as proxy with dansguardian and I use OpenDNS... I have put on a blacklist on dansguardian microsoft.com but it looks like it is not…
Pitto
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