RE: Data Transfer vs IOPS

Usually, transfer rate is the much more important metric.  

However, IF you are supporting a very high rate of IO operations that are small, a difference in IOPS for infrastructure with the same (or similar) maximum transfer rates can be important.  

Notice that this includes knowing something about the I/O request size you plan to support, so it is NOT a contradiction of what Tim wrote, and in fact it may be an edge case. But it is and edge case I have seen. You should definitely be interested in the transfer rate, but you might also be interested in IOPS itself.  

mwf  

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Tim Gorman Sent: Tuesday, June 21, 2022 4:50 PM
To: veeeraman_at_gmail.com; ORACLE-L
Subject: Re: Data Transfer vs IOPS  

As a metric for comparisons, IOPS are useless without I/O request size (or "block size").

For example, comparing 20000 IOPS for one disk means nothing in comparison to 10000 IOPS on another disk, unless you know the I/O request sizes used.

In contrast, throughput (a.k.a. data transfer rate) is a comparative metric by itself, which is probably why Dell uses it.

On 6/21/2022 12:55 PM, Ram Raman wrote:

We are looking into adding some new disks to our server with server attached storage. One of the solutions we are considering is this <https://www.dell.com/en-us/shop/768tb-ssd-vsas-read-intensive-sed-512e-25in-hot-plug/apd/345-bcdn/storage-drives-media#techspecs_section> . The page talks about Data Transfer rate but I am interested in the IOPS, we have the IOPS info for the older disks. Does anyone know how to get the IOPS (read, write, .. any) for those disks  

Thanks,

Ram

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http://www.freelists.org/webpage/oracle-l Received on Wed Jun 22 2022 - 15:42:54 CEST