My backing file system is ldiskfs. The storage hardware is HDD I guess(Since I am using emulab cloud storage) I am doing buffered I/O.
On Mon, Sep 27, 2021 at 4:20 PM Patrick Farrell <[email protected]> wrote: > It does depend on your storage hardware, but modern Lustre software is > generally the same or faster for reads. > > What is your backing file system - ldiskfs or ZFS? And what is the > storage hardware? And are you doing direct or buffered I/O? > ------------------------------ > *From:* lustre-discuss <[email protected]> on > behalf of Nagmat Nazarov <[email protected]> > *Sent:* Monday, September 27, 2021 5:57 PM > *To:* [email protected] <[email protected]> > *Subject:* [lustre-discuss] Why reads are slower than writes on lustre > file system? > > Dear Engineers, > > I have started working on a lustre file system. I have done couple of > experiments so far: > On the first experiment I am writing 100 files each 10MB and the batch > size is 4K. I got 107MB/s bandwidth. > > On the second experiment I am (writing 10 files each 10MB and reading 1 10 > MB file back) for 10 times. Here also the average bandwidth is 106MB/s > while read average bandwidth is 59MB/s which is very weird I guess? > > My question is, generally on ext4 file systems read average bandwidth is > faster that write average bandwidth, why is it 2 times slower on lustre > file system. My ethernet speed is 1Gb/s. > > Kind regards > Nagmat Nazarov > > >
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