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How do I see if my disk cache is disabled on Linux?
I have an ubuntu linux virtual machine here and I think there is no disk cache. For example this is the output from free -m: total used free shared buffers cached Mem: 512 98 413 0 0 0 -/+...
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What is read cache in “[sda] Write cache: enabled, read cache: enabled,...
Is it “IDE drive’s read-lookahead feature (usually ON by default)” as treated by hdparm? If it’s not, how can this be turned off? Well, I’ve found out proper tool to control this cache: sdparm. It...
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Raid Caching configuration suggestions
I’m wondering if there’s the optimal Cache setting for the following Raid controllers and raid setups. (OS: windows 2008 R2, App: II7, DB: SQL Server 2008 R2 Enterprise) PERC 6/i: (The default setting...
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How much does HDD cache matter with Linux softraid?
I’m in a process of renewing/expanding my disk sets, but not quite sure what kind of disks to get, cache-wise. What difference does disk cache amount of 16/32/64MB do, in capacities of, say, 1/1.5/2TB...
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Caching/preloading files on Linux into RAM
I have a rather old server that has 4GB of RAM and it is pretty much serving the same files all day, but it is doing so from the hard drive while 3GBs of RAM are “free”. Anyone who has ever tried...
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Disable all disk caching for apache2 on linux
For benchmarking purposes I want to force Apache 2 to load each requested file from disk instead of loading it from a cache in memory. From what I have read doing a sync followed by echo 3 >...
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Rapid SSD vs. RAM in servers
Per GB prices of rapid SSD (like Intel X25-E) come close to prices of high-end RAM. So what extra advantages does SSD give you? What are particular reasons, why you buy SSD, instead of just putting...
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What is read cache in “[sda] Write cache: enabled, read cache: enabled,...
I’m trying to figure out what the read cache part of the following message refers to: [sda] Write cache: enabled, read cache: enabled, doesn’t support DPO or FUA Is it “IDE drive’s read-lookahead...
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varnish delete least requested files
I see that varnish can be configured to set -smalloc or -sfile with a certain size. I want to set a file cache of 1G such that least requested files are deleted first when cache is full. Is this...
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