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Questions tagged [cache]

A location or process for storing of transitory or temporary data in order to improve application or system performance.

1588 questions
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Windows File Cache drops suddently

I have a 64-bit Windows 2003 server with 48 CPU cores and 128GB of RAM running a single application (SQL 2008 Analysis Services). SSAS is currently using about 50GB of memory. SSAS relies to a large extent on the Windows File Cache to hold…
BradC
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Disable DNS Caching PHP

I need to get the latest A records of a DNS in a script. The script is doing some monitoring operations. The Default TTL of DNS record is 5 minutes, but the monitoring script is running every minute. I am using PHP's function dns_get_record to get…
Sparsh Gupta
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Making SATA disk write cache safe

Supposedly (see, e.g., a question about it here), with NCQ enabled drives, the drive write cache is supposed to be safe, as in it doesn't lie to the OS about data being committed to the platters when it isn't. I'm trying to figure out what settings…
derobert
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Squid 3 reloading makes it stop serving requests

So, we use Squid 3 here (3.0.STABLE8-3+lenny4), pretty standard configuration (no dansguardian or similar) + NTLM authentication with LDAP background, circa 1000 users on a busy day, and our acls reference some external files (allowed/blocked…
coredump
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Akamai NetStorage vs. Akamai edge service

What's the difference between using Akamai NetStorage vs. Akamai's Edge Service? Below are the concepts that I believe differentiate them but I'd like more details from more experienced people. NetStorage This is literally a high performance hosting…
Mark
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Akamai vs smaller CDN for small/medium-size ecommerce traffic? (caching, latency, NetStorage)

The small/medium sized online retail company I work for uses Akamai as our CDN for static images, but I'm wondering whether it might be hurting rather than helping and, if it's suboptimal, what we should be doing instead. We get monthly traffic of…
Aaron
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How to make Varnish ignore, not delete cookies

I want to use Varnish to cache certain pages even in the presence of cookies. There are 3 possibilities that I need to take care of: An anonymous user is viewing some page A logged in user is viewing some page with light customization. These…
Jason Christa
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DNS as distributed cache

We have a use case to cache 300+ million pieces of such data each with a unique key. I know this is unorthodox but, it has been suggested at my company that DNS could be used as a fast distributed cache for small (<512 bytes) pieces of data. The…
user7193
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ZFS with L2ARC (SSD) slower for random seeks than without L2ARC

I am currently testing ZFS (Opensolaris 2009.06) in an older fileserver to evaluate its use for our needs. Our current setup is as follows: Dual core (2,4 GHz) with 4 GB RAM 3x SATA controller with 11 HDDs (250 GB) and one SSD (OCZ Vertex 2 100…
Florian Kruse
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Identical traffic

I am running an application server and logging all requests for analysis purposes later. One interesting trend I noticed last night was, I had a visitor from Texas on FIOS share identical traffic with bluecoat in California. What would cause the…
Walter White
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1 answer

Microsoft Storage Spaces Write-Back Cache exists on HDD-only single-tier parity disk?

I created a parity storage space on 3x external USB 4tb HDD attached to a Windows 10 1809 machine. I then moved those HDDs to a Server 2019 1809 machine and added 1x additional 4tb HDD. I noticed there is an existing 32mb write-back cache in this…
goofology
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ZFS - enable or disable disk cache?

I'm setting up ZFS (through FreeNAS) with RAIDZ1 on a server with 4 x WD Red SATA HDDs (connected through a PERC H330 in HBA mode). The server is hooked to a UPS. For ZFS and in this setup, does it make sense to enable HD cache of each disk, or is…
matthias_buehlmann
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wp nginx fastcgi cache vs wp super cache

I've got a 512mb server instance with one core. As of right now I have about 3 websites with about 10k articles, on all of them I have wp super cache enabled. The typical cache time is 3600 secs or 7200 secs. And The vps instance is holding on just…
Ryan
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How to get Squid to not cache files with certain extensions?

I've found information on how to keep squid from caching domains/IP addresses, however, that's not quite what I want. I'd like to prevent it from caching .jnlp and .jar files. The core problem being that when I push updates out to our server, our…
Brian Knoblauch
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KVM Host: Hardware RAID with cache + BBU vs. Linux Software RAID with LVM writeback cache and UPS

I want to set up a RAID 5 with 3x1TB drives on a Linux KVM-Host. The RAID will be used as LVM thin storage for VM disks. There has already been much discussion on hardware raid vs software [1]. According to this discussion one should not use…
c0d3z3r0
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