[Disksim-users] Need up-to-state HDD diskspec

[liu zhuo]

Hello, everyone

The diskspecs attached within Disksim4.0 seem to be out of date (very small
capacity and only for SCSI disks).
Is there anyone who has up-to-date HDD diskspec model (*.diskspec, *.model
and *.seek files)? For example, SATA disk with hundreds of GB capacity.
The dixtrac tool within DiskSim seems only work with SCSI and FC disks.

Thanks,



On Tue, Sep 20, 2011 at 11:00 AM, <disksim-users-request at ece.cmu.edu> wrote:

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>   1. Re: running a trace without timestamps (Lei Tian)
>   2. How to calculate (???)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 19 Sep 2011 11:30:33 -0500
> From: Lei Tian <leitian.hust at gmail.com>
> Subject: Re: [Disksim-users] running a trace without timestamps
> To: Andy Twigg <andy at acunu.com>
> Cc: disksim-users at ece.cmu.edu
> Message-ID: <312A6862-60E6-4790-85DF-C332CB731467 at gmail.com>
> Content-Type: text/plain; charset=us-ascii
>
> In general, Once Disksim is starting to handle the current request, it will
> prepare the next request in the trace. [see the getnextevent() function in
> disksim.c]
>
> Therefore, you may try this way:
>
> Assuming the fixed queue length is N, no matter what time the timestamps of
> the first N requests in the real trace are, you could change the timestamps
> of them with a very slight ascending order(e.g., 0.000001ms difference) in
> io_using_next_external_event(). In doing so, DiskSim will enqueue them into
> its IOdriver request queue and start to process them one by one. Once the
> threshold N is reached, the No. N+1 request must be given a very large
> timestamp (e.g., 1000000ms) to make sure this request won't be enqueued and
> scheduled by Disksim if any one of the last N requests is not done. When one
> request of the last N requests is completed, you can find the No.N+1 request
> [its event type is NULL_EVENT] and dequeue it from the intq queue, change
> its timestamp as simtime + 0.000001ms, and then enqueue it in the intq queue
> again. In doing so, the length of the request queue of yours is always N,
> and DiskSim will do the rest for you.
>
> Just for your reference. Good Luck!
>
> Lei
>
> On Sep 19, 2011, at 8:55 AM, Andy Twigg wrote:
>
> > Does anyone know an easy way to run a given trace of operations (R/W,
> > offset, len) without having explicit timestamps? i.e. the requests
> > enter a queue of a fixed size and the device serves the queued
> > requests as quickly as possible.
> >
> > I'm inclined to modify synthgen to read a trace, but I'm hoping
> > there's an easier way..
> >
> > Thanks,
> > Andy
> > _______________________________________________
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>
> ------------------------------
>
> Message: 2
> Date: Tue, 20 Sep 2011 09:05:56 +0800 (CST)
> From: ??? <zh-lian at 163.com>
> Subject: [Disksim-users] How to calculate
> To: disksim-users at ece.cmu.edu
> Message-ID: <9eb484.a4e5.132845e2c7e.Coremail.zh-lian at 163.com>
> Content-Type: text/plain; charset="gbk"
>
> Hi,
>
> Through the output file in the simulation, I found 'Overall I / O System
> Requests per second: 90.138218',
> which is too small. How do I calculate the IOPS, throughput and average
> response time.And how do I define
> read and write block size.
>
> Thanks,
> Zhaohu Li
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-- 
Zhuo Liu
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