Setup: Windows Server 2008 R2, Hosted on HyperV Virtual Machine allocated 3GB Memory. I’ve setup a RAMDisk (capacity of 512MB more than sufficient for our requirements) using ImDisk on this virtual web server and allocated it 3GB of RAM (the hosted applications don’t require any more than ~768MB under heavy load). Originally the WebRoot directory was on a network share which performed sufficiently but have noticed under heavy load this has resulted in a noticeable [...]Continue Reading »
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 more RAM in your server machine, to have it used as HDD cache or even create RAM-disk? EDIT: of course I’m aware, that SSD are persistent. But so is the data in disk cache. Reading from RAM has got [...]Continue Reading »
I have a 4 CPU 16GB RAM system with an Areca 1230 RAID card and 6 HDs in a RAID 0+1 configuration with 1 hot spare. System has 2 onboard 1Gpbs nics I want to turn the system into a NAS. It seems like 16GB RAM for a NAS is a waste though. Is there any way to possibly turn a good portion of that extra RAM into cache, or maybe some kind of RAMDRIVEs [...]Continue Reading »
I just installed Debian 5 (Lenny) and I noticed that /lib/init/rw is reported as a RAM Disk (tmpfs). I’ve only had experience with Fedora so I’m curious what function does that directory serve in Debian. Can it be used by user written shell scripts to cache stuff or is it off-limits and only for use by the OS? Thanks. As others point out (this would have been a commend on their replies, but grew too [...]Continue Reading »
I need to create a lot of temporary files for which I need to have fast access, so I’m thinking about using a RAM disk. The problem is that the temporary files might get pretty big (1-4 GB) and in this case the disk-storage would be OK. Is there any way to create a mix between a RAM disk and a physical HDD, so that the HDD gets used in the worst case (when I [...]Continue Reading »
Quick and dirty summary: I want something like a write cache that drains only when the system isn’t busy. I want something along the lines of this question http://serverfault.com/questions/57915/ramdisk-and-physical-raid with a slight twist. For a particular build I’m doing often, I would like to keep build output in a ramdisk that eventually gets written out to disk. One particular target I’m building is really a bunch of cp, tar, gzip and such so I’m disk [...]Continue Reading »
Using ImDisk for a 250MB RAM drive, with the TEMP environment variable, speeds up our Windows XP systems a lot – probably because the NTFS write-through latency when creating new files is avoided, or maybe just because it reduces disk activity, so that other disk operations don’t get interrupted by seeks. However, I haven’t found a way to make ImDisk re-create the temp drive and format it at boot time. How can I make ImDisk [...]Continue Reading »
Currently I’m using ESX (v3 and v4) to test a scripted OS (Windows 2003) and application install DVD. The DVD ISO (8GB) is mounted on a 1Gbps NFS datastore and the VMDK’s (20GB) are on an SSD mounted via NFS over a 10Gbps link. It still takes a lot longer than I’d really like for to run through a test iteration and I’m wondering if mounting the virtual disks and ISO on a RAM disk [...]Continue Reading »
We currently use AR Soft RAM Disk on some Windows 2003 servers for storing short lived temporary files. Looking forward to a move to 64-bit Windows Server 2008 I’m wondering what options there are for a RAM disk since it appears AR Soft RAM Disk was discontinued in 2005. I’m not looking for any physical disk backing, just a pure RAM disk that appears like a normal drive to Windows. Does anyone have any experience [...]Continue Reading »
I’ve upgraded one of our servers (debian lenny) from backports. It upgraded the kernel to 2.6.32-trunk-amd64, and switched the disk access to UUID. Everything works fine, however, /dev/ram0 no longer gets created and I’m unable to see it in /dev/disk/by-uuid: # ls -l /dev/disk/by-uuid/ total 0 lrwxrwxrwx 1 root root 10 2010-11-02 10:20 0670c658-a28d-4e93-991c-7e270a1dfbf3 -> ../../sda3 lrwxrwxrwx 1 root root 10 2010-11-02 10:20 07DA-0A15 -> ../../sda1 lrwxrwxrwx 1 root root 10 2010-11-02 10:20 ba59116d-c127-431b-bc00-c2c676ea0cb6 -> [...]Continue Reading »
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