Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Jochen Schulz
Kevin Ross: > > Using an SSD as a cache for a hard drive isn't a good idea, since > SSD's are orders of magnitude slower in writing than hard drives are. That strongly depends on the model. Intel SSDs are significantly faster than traditional hard disks when doing random writes. Other SSDs are be

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Jochen Schulz
Ron Johnson: > On 2009-09-02 11:38, Paul Richards wrote: > [snip] >> >> An SSD cache has a number of benefits over a filesystem cache in RAM. >> Price per GB will be much lower, and also it will persist over a > > An SSD drive cheaper than RAM sticks?? Sure. An 80GB ntel X25m still costs at leas

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Ron Johnson
On 2009-09-02 11:38, Paul Richards wrote: [snip] An SSD cache has a number of benefits over a filesystem cache in RAM. Price per GB will be much lower, and also it will persist over a An SSD drive cheaper than RAM sticks?? -- Brawndo's got what plants crave. It's got electrolytes! -- To UN

RE: Forming drives together into a cache hierarchy

2009-09-02 Thread Kevin Ross
> From: Paul Richards [mailto:paul.richa...@gmail.com] > Sent: Wednesday, September 02, 2009 3:30 AM > > Is there a way to combine a large slow drive with a fast small drive > in such a way that the faster drive simply becomes a cache for the > larger drive? > > I imagine a computer where I'd lik

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Jochen Schulz
Paul Richards: > 2009/9/2 Jochen Schulz : >> >> My recommendation: buy more RAM, install the OS to an SSD and copy the >> data most often used there as well. Put the rest on a regular disk and >> write a boot script to force the data you are interested in into the >> filesystem cache. >> >> If yo

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Paul Richards
2009/9/2 Jochen Schulz : > Ron Johnson: >> On 2009-09-02 05:30, Paul Richards wrote: >>> >>> Is there a way to combine a large slow drive with a fast small drive >>> in such a way that the faster drive simply becomes a cache for the >>> larger drive? > -- snip >> I'd think about selling the SSD and

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread green
Paul Richards wrote at 2009-09-02 05:30 -0500: > Is there a way to combine a large slow drive with a fast small drive > in such a way that the faster drive simply becomes a cache for the > larger drive? > > I imagine a computer where I'd like to have a small fast SSD and a > large but slow spinnin

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Jochen Schulz
Ron Johnson: > On 2009-09-02 05:30, Paul Richards wrote: >> >> Is there a way to combine a large slow drive with a fast small drive >> in such a way that the faster drive simply becomes a cache for the >> larger drive? -- snip > I'd think about selling the SSD and either buy more RAM or a SCSI >

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Mark Allums
Paul Richards wrote: 2009/9/2 Paul Richards : Is there a way to combine a large slow drive with a fast small drive in such a way that the faster drive simply becomes a cache for the larger drive? I imagine a computer where I'd like to have a small fast SSD and a large but slow spinning disk. I

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Ron Johnson
On 2009-09-02 05:30, Paul Richards wrote: Is there a way to combine a large slow drive with a fast small drive in such a way that the faster drive simply becomes a cache for the larger drive? I imagine a computer where I'd like to have a small fast SSD and a large but slow spinning disk. I'd li

Re: Forming drives together into a cache hierarchy

2009-09-02 Thread Paul Richards
2009/9/2 Paul Richards : > Is there a way to combine a large slow drive with a fast small drive > in such a way that the faster drive simply becomes a cache for the > larger drive? > > I imagine a computer where I'd like to have a small fast SSD and a > large but slow spinning disk.  I'd like to pu

Forming drives together into a cache hierarchy

2009-09-02 Thread Paul Richards
Is there a way to combine a large slow drive with a fast small drive in such a way that the faster drive simply becomes a cache for the larger drive? I imagine a computer where I'd like to have a small fast SSD and a large but slow spinning disk. I'd like to put the two block devices together so