Regarding the error checking, as others suggested you're best buying two
devices and mirroring them. ZFS has great error checking, why not use it :D
http://blogs.sun.com/perrin/entry/slog_blog_or_blogging_on
And regarding the memory loss after the battery runs down, that's no different
to any
Erik Trimble Sun.COM> writes:
>
> * Huge RAM drive in a 1U small case (ala Cisco 2500-series routers),
> with SAS or FC attachment.
Almost what you want:
http://www.superssd.com/products/ramsan-400/
128 GB RAM-based device, 3U chassis, FC and Infiniband connectivity.
However as a commenter poi
On Mon, 30 Jun 2008, Ross wrote:
The Gigabyte iRAM looks great. £100 for the basic unit, around £200
fully populated with 4GB.
I am not sure that i would want to entrust my data to a product which
contains no error checking/correction at all and loses its memory
after a day if the computer
Ok, replying with the details of what I've found so far.
First of all, SSD devices, despite high published IOPS figures hide very poor
IOPS *write* figures. I've been sent the manual for the Mtron Pro 7000 series
SSD's, and while they have random read figures in the 12,000 range, the random
wr
Richard Elling wrote:
> Erik Trimble wrote:
>
>> * 5.25" CDROM-form-factor RAM disk, as above
>>
>>
>
> CD-ROMs are dead. With the size of slim DVDs today, you wouldn't
> be able to put much space in them.
>
>
The point here is a 5.25" half height device, that will fit in a drive
ba
> "et" == Erik Trimble <[EMAIL PROTECTED]> writes:
et> SSD used to refer strictly to standard DRAM backed with a
et> battery (and, maybe some sort of a fancy enclosure with a hard
et> drive to write all DRAM data to after a power outage).
et> * 3.5" LP disk form factor, SCSI h
On Sat, Jun 28, 2008 at 1:42 AM, Erik Trimble <[EMAIL PROTECTED]> wrote:
> Brian Hechinger wrote:
> > On Fri, Jun 27, 2008 at 03:02:43PM -0700, Erik Trimble wrote:
> >
> >> Unfortunately, we need to be careful here with our terminology.
> >>
> >
> > You are completely and 100% correct, Erik. I've
On Jun 28, 2008, at 10:17, Richard Elling wrote:
> This week, Verident announced a system using Spansion EcoRAMs
> (DRAM + NOR Flash on a DIMM form factor) for main memory.
> This is almost getting there, but seems to require some special OS
> support, which is not surprising. The holy grail is f
Erik Trimble wrote:
> Brian Hechinger wrote:
>
>> On Fri, Jun 27, 2008 at 03:02:43PM -0700, Erik Trimble wrote:
>>
>>
>>> Unfortunately, we need to be careful here with our terminology.
>>>
>>>
>> You are completely and 100% correct, Erik. I've been throwing the
>> term SSD
I believe there's a block rewrite function being worked on, which if memory
serves will enable further technologies such as changing raid-z stripe size on
the fly, defrag, etc.
I doubt 'soon' is a word you could use to describe the timeframe for these
arriving however.
This message posted f
Thanks, that's something I hadn't realised. After googling, I've found this
article comparing the i-RAM with a couple of SSD's, and the difference is quite
something:
http://www.xbitlabs.com/articles/storage/display/ssd-iram_5.html
However, the SATA interface's limitations soon seem to even thi
Brian Hechinger wrote:
> On Fri, Jun 27, 2008 at 03:02:43PM -0700, Erik Trimble wrote:
>
>> Unfortunately, we need to be careful here with our terminology.
>>
>
> You are completely and 100% correct, Erik. I've been throwing the
> term SSD around, but in the context of what I'm thinking, b
>
> > Can anybody confirm that random read performance is definitely
> > better with mirrored volumes. Does ZFS use all the disks in the
> > mirror sets independently when reading data? Am I right in thinking
> > I could have around 7x better random read performance with the 15
> > mirrored drive
On Fri, Jun 27, 2008 at 03:02:43PM -0700, Erik Trimble wrote:
> Unfortunately, we need to be careful here with our terminology.
You are completely and 100% correct, Erik. I've been throwing the
term SSD around, but in the context of what I'm thinking, by SSD I
mean this new-fangled flash based SS
Unfortunately, we need to be careful here with our terminology.
SSD used to refer strictly to standard DRAM backed with a battery (and,
maybe some sort of a fancy enclosure with a hard drive to write all DRAM
data to after a power outage). It now encompasses the newer Flash-based
devices. My
On Fri, Jun 27, 2008 at 08:32:23AM -0700, Richard Elling wrote:
>
> You will want mirrored slogs.
Yes, always an excellent recommendation.
> Note that there are some companies, Crucial and STEC come to mind,
> sell SSDs which fit in disk form factors. IIRC, Mac Book Air and EMC
> use STEC's SS
On Fri, Jun 27, 2008 at 07:22:48AM -0700, Ross wrote:
> Thanks both, very good pieces of advice there.
>
> Wonko, I was about to question how much difference the iRAM will actually
> make with it being on a single SATA connection, but after googling, for ??70
> + RAM it's worth buying just as
On Fri, Jun 27, 2008 at 11:50 AM, Albert Chin <
[EMAIL PROTECTED]> wrote:
> On Fri, Jun 27, 2008 at 08:13:14AM -0700, Ross wrote:
> > Bleh, just found out the i-RAM is 5v PCI only. Won't work on PCI-X
> > slots which puts that out of the question for the motherboad I'm
> > using. Vmetro have a 2
On Fri, Jun 27, 2008 at 08:13:14AM -0700, Ross wrote:
> Bleh, just found out the i-RAM is 5v PCI only. Won't work on PCI-X
> slots which puts that out of the question for the motherboad I'm
> using. Vmetro have a 2GB PCI-E card out, but it's for OEM's only:
> http://www.vmetro.com/category4304.ht
Brian Hechinger wrote:
> On Fri, Jun 27, 2008 at 07:58:42AM -0500, [EMAIL PROTECTED] wrote:
>
>> Yes. two caveats though. ZFS is a COW filesystem, currently with no
>> defrag. Placing heavy write (vmware is) on this type of storage
>> (especially, but not only if you are planning on using snaps
Bleh, just found out the i-RAM is 5v PCI only. Won't work on PCI-X slots which
puts that out of the question for the motherboad I'm using. Vmetro have a 2GB
PCI-E card out, but it's for OEM's only:
http://www.vmetro.com/category4304.html, and I don't have any space in this
server to mount a
Thanks both, very good pieces of advice there.
Wonko, I was about to question how much difference the iRAM will actually make
with it being on a single SATA connection, but after googling, for £70 + RAM
it's worth buying just as an experiment.
I'm really not interested in iSCSI, it might be s
On Fri, Jun 27, 2008 at 07:58:42AM -0500, [EMAIL PROTECTED] wrote:
>
> Yes. two caveats though. ZFS is a COW filesystem, currently with no
> defrag. Placing heavy write (vmware is) on this type of storage
> (especially, but not only if you are planning on using snapshots) you will
> tend to see d
[EMAIL PROTECTED] wrote on 06/27/2008 03:39:41 AM:
> I'm likely to be building a ZFS server to act as NFS shared storage
> for a couple of VMware ESX servers. Does anybody have experience of
> using ZFS with VMware like this, and can anybody confirm the best
> zpool configuration?
>
> The serve
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