John Drescher wrote:
> On Wed, Jul 22, 2009 at 4:49 PM, Bob Hetzel<beh AT case DOT edu> wrote:
>>
>> John Drescher wrote:
>>> On Wed, Jul 22, 2009 at 3:30 PM, Bob Hetzel<beh AT case DOT edu> wrote:
>>>> Has anybody tinkered around with spooling backups on an SSD (aka solid
>>>> state drive) or a raid-0 pair of them for higher performance?
>>>>
>>> I spool to a 4 drive sata raid 0 but since I only have a single
>>> gigabit nic connection the file system performance is not the limiting
>>> factor.
>>>
>>> John
>> I'm trying to set up an LTO-3/LTO-4 setup and modern fast (15k rpm)
>> conventional hard drives are > $500 each though it seems.
>>
>> For LTO-2 and below this is far cheaper since the tape drive speeds are so
>> much lower but I'd like to keep the tape drive writing at > 60 MB/sec.  In
>> addition I'd like to keep concurrency up so one slow backup doesn't drag the
>> prolong the others as badly.
>>
> How about 2 to 4 150 or 300GB velociraptors in raid 0.
> 
> http://www.wdc.com/en/products/products.asp?driveid=459
> 
> The 300GB models are around $200 USA. Much faster than a 7200RPM sata
> drive especially when it comes to seeks.
> 
> For SSD it will be very expensive to do that unless you have a small
> spool area.

In theory, the latency from random IO should be much closer to zero on a 
flash drive than on a thrashing hard drive, so I was hoping I might need 
only 1 or two 64GB or 128GB flash drives to provide decent spool size, 
perhaps not even raid-ed.

In addition, SSD/flash drives should be silent and heat up the room less 
(although that latter effect will be small--10 watts vs 2 watts for each drive)

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