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2
votes
1answer
43 views

btrfs increase raid capacity by replacing disks (and not adding disks!)

I'm very excited about the new features of btrfs and would like to start tesing it. Before I get started, I would like to ask if btrfs supports increasing raid capacity by replacing disks by bigger ...
0
votes
0answers
27 views

3ware 9750-8i RAID5 Increase Raid Capacity by Replacing Disks

i did some research in the documentation of the 3ware Raidcontroller (LSI / Avago / Broadcom) 9750-8i regarding online capacity expansion. There is useful information in it about increasing the raid ...
0
votes
1answer
51 views

Hard disk reporting incorrect size in BIOS

I have a server with a software RAID system. There are 4 disk in the array: 4 x 4TB model WD40EFRX-68WT0N0 I noticed that the OS was reporting one of the disks to be 3TB, so I rebooted and ...
0
votes
1answer
35 views

Varnish Capacity Planning and Hardware Sizing

we want to run a new varnish node to cache video segments "average object size 3MB" and wondering if there is a way to measure the hardware specs "CPU/Memory/Disk" required based on the user's ...
0
votes
1answer
168 views

4TB drives in RAID 1 with Promise SuperTrak EX8350

Two 4TB drives are connected to a Promise SuperTrak EX8350 controller with the intention of setting-up a RAID 1 array. Before attempting to create any logical drives, the capacities of both drives ...
1
vote
1answer
2k views

Insufficient free space: X extents needed, but only Y available

I'm trying to extend a LVM in a Vmware Workstation 12 Pro CentOS VM. Below are the steps I am following and where I stopped because don't know how to folow from there: Create the primary partition ...
2
votes
1answer
578 views

Is there a maximum 'anything' when running a high number of processes on Windows

I have a series of well optimised services written in house using .Net running on many 512GB RAM server (a mix of Xeons including E5-2697 V2 etc). Is there a maximum handle, process, thread count that ...
4
votes
1answer
547 views

Common back pressure strategies for services under sustained high load

I'm wondering what are the common backpressure strategies people use for their web services? Imagine your service operates under heavy load, and at some point the load reaches 120% of your capacity. ...
0
votes
2answers
5k views

Apache: “Server seems busy”, but lots of idle processes

I should note that I'm not a sysadmin. You'll figure that out very shortly. :) In a nutshell: Apache keeps taking a breather during heavy loads and all processes go idle. This is a polling server ...
0
votes
1answer
157 views

How can I find the cause of “Service temporarily unavailable” from apache2 on really small vm?

I just moved all my web applications to a really small vm (128 megs of memory) running linux xubuntu, with no GUI. Most of my applications run fine (if a bit slow, but that's acceptable) except for ...
1
vote
2answers
3k views

ZFS iSCSI and free capacity in VMFS

I use ZFS in FreeNAS 8.0.4 and use iSCSI to provide a LUN to Vmware ESXi 5.0. I post it at http://forums.freenas.org/showthread.php?10990-Memory-utilization-and-performance-problem/page4, but I ...
2
votes
3answers
5k views

Increasing a Linux partition once VM size increased in vSphere?

I have a Ubuntu 12.04 VM running on VMWares ESXi 5.1. The server (VM) itself has run out of space, the results of df -h are as follows: Filesystem Size Used Avail Use% Mounted on /dev/sda1 ...
7
votes
2answers
578 views

Can I have 2Gbit over 1Gbit Nics [closed]

So this really baffles me. Apparently because 1Gbit can transmit data in both directions simultaneously it should be possible to get 2Gbit of data transfer on a single NIC (1Gbit flow seend and 1Gbit ...
1
vote
1answer
217 views

VPS users capacity [duplicate]

Possible Duplicate: How do you do Load Testing and Capacity Planning for Web Sites I was wondering if there is a way to actually determine how many users my VPS can handle until it will run ...
5
votes
3answers
8k views

Can a 3ware 9500S-4LP controller use 3TB drives?

We have a Rackable Systems server used for backup storage. Recently we purchased a couple 3TB drives to expand the storage, but they are only showing a capacity of 746.52 GB as reported by 3ware's ...
3
votes
1answer
741 views

Capacity planning for an enterprise java application

If you had to do capacity planning and hardware sizing "BEFORE" you had a chance to actually code and test the application (typically while you are defining solution architecture), how would you do it?...
4
votes
3answers
974 views

Difference between FBWC capacities?

When buying a FBWC storage controller such as HP's P420, you can choose either a 512MB, 1G, or 2G capacity. What differences do these capacity sizes provide? Is there a metric I can use to choose ...
0
votes
1answer
89 views

Why would reducing capacity under load improve latency on a server?

In this talk at Berkeley, Jeff Dean's slides contain the following note, about a third of the way through the presentation: Non-intuitive: remove capacity under load to improve latency (?!) The ...
1
vote
1answer
471 views

Dedicated or Cloud server hosting for 5000 daily unique visitors [closed]

I am playing with very limited budget for ecommerce app. I am not sure how the growth pattern will be. So want to start with minimal config with capacity to scale. To start with support for 5000-...
0
votes
2answers
211 views

Increasing capacity of RAID5 array [closed]

Assume that I built an 2TB RAID5 array and its running and some data is stored on it. Now I need to increase its size to 5TB. Can I increase capacity (By adding extra drives)? How? If Yes is it ...
0
votes
2answers
1k views

Cassandra: capacity planning [duplicate]

Im investigating moving some large DBs from MySQL to Cassandra and Im trying to figure out how to plan the cluster. Historically, one would just buy disks to contain the relevant data but Im not clear ...
0
votes
3answers
6k views

How to calculate/estimate the capacity of a switch theoretically [closed]

I don't know whether this is the correct place to ask this question. If not, could any one tell me some sites or forums to ask such questions? Thanks in advance. My question is the same meaning as ...
1
vote
2answers
300 views

Using all space on Amazon EC2 - Medium tier

I'm currently running an Amazon EC2 - Medium Tier reserved instance for hosting client websites. Recently it seems space is starting to run low on /dev/sda1 - so I thought I'd better prepare.. df -h ...
0
votes
1answer
47 views

Within IRIX : enumerate physical drives, and their capacity

I'd like to know what physical disk drives are attached to an IRIX system, and the capacity (or at least geometry) of each disk. I can get the former through hinv, but that doesn't include capacity/...
1
vote
2answers
2k views

How can I configure nginx to serve a “server overloaded” or out of capacity page?

I've got a client who's expecting a plug on national TV tonight, and they just told me (love how that works, eh?). I'm trying to do some capacity planning in what little time I have, and the one ...
1
vote
6answers
11k views

How do I find the system's disk capacity?

I run the command df -g to get the GB block sizes in the second column (left to right). If I want to get the total capacity for all hard disks, which command should I use? OS is AIX.
2
votes
2answers
222 views

What percentage of its capacity should I aim to run a network at?

First of all, apologies if this is the wrong StackExchange site for this question - it's about Ethernet network capacities, but not specifically about servers etc. I am designing a network for a data ...
1
vote
2answers
881 views

NetApp Usable Capacity Magic

I'd like to know the exact math of how to calculate usable capacity on a NetApp filer's aggregates. Out of experience I've been using a magic factor of 0.65-0,7 times the net RG capacity of all the ...
0
votes
2answers
416 views

identical load balanced VM's on same host

If I have a VM (either KVM or ESXi) serving static content on Apache and a video streaming webapp on Tomcat, is there a logic in running multiple instances on the same VM on the same piece of kit and ...
3
votes
2answers
281 views

How would I show a static “over capacity” page in IIS?

I'm launching a new site soon and I expect it to make it into mainstream media. At this point, I'm not sure our server will be able to handle all of the requests. Is there a way that I can detect the ...
0
votes
1answer
392 views

Why do ticket websites crash?

I hope this fits into the expanse of serverfault. Apologies if it doesn't. Why do ticket websites selling tickets for major concerts/events still crash when they make the tickets available? Surely, ...
10
votes
9answers
21k views

How does one find which files are taking up 80% of the space on a Linux webserver?

The drive is constantly filling up. You've hunted down all the spare and random files you can. grep'd for coredump files and even removed some of the un-needed backups... What would be your next move....
1
vote
2answers
4k views

Maximum size of an indexing service catalog

Does anyone know what the maximum size on an indexing service index is on Windows 2008? We are having all sorts of problems with the index hanging and not processing new documents. I just deleted ...
8
votes
10answers
21k views

Where to purchase a server capable of 512GB of RAM? [closed]

Where can I purchase a single server capable of 512 GB, yes GB, of RAM? The most I've seen is 256 GB (32 DIMM x 8 GB per stick)
-3
votes
4answers
433 views

Apache Load [closed]

Am planning to run a chat script on my Apache server and it uses polling every second to receive messages. I know about Comet etc, but I do not want to use them at the current time. I am wondering if ...
6
votes
5answers
6k views

How does a 32-bit machine support more than 4 GB of RAM?

I have always wondered about this and never totally understood how 32 bit machines are addressing more than 4 GB of RAM. I mean, there are no more address lines left, correct? I know even in our ...