Re: SSDs and Journalling (was Re: LTO3 SCSI to LTO4 fiber)

I am jumping in here late ( maybe )...
What are the SSDs for? Data Writes while faster than spinning disks they
are not any where close to Read Speeds they can achieve. Were they Mirrored
or Raided? If mirrored, the transaction is not complete until Both drives
are written. Reads are done fro either of the pair.
Since Journaling is very heavy on the write, I could see where using too
few disks ( SSDs or HDDs ) could slow things down.

On Mon, Sep 10, 2012 at 2:01 PM, Evan Harris <auctionitis@xxxxxxxxx> wrote:

Rob

This is interesting. Do you know why not journalling made the SSDs
perform better ? It sounds counter intuitive:
- What was it about journalling that made the SSDs less valuable ?
- Was it a BPCS thing ?
- Do you journal the IFS and was that a factor ?

I'm not doubting your word, just intensely curious as I have a couple
of BPCS customers who are also journalling considering SSDs.

a valid check. After all, I was gung ho for SSD's after seeing their
effect with our data in Rochester only to be dismayed by the actuallity.
There, the difference was that we didn't journal in Rochester and adding
the HA Journal Performance option back at home was a far better bang for
the buck.

--

Regards
Evan Harris
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