On Mon, Feb 2, 2015 at 11:37 PM, Jatin Davey <jashokda at cisco.com> wrote:> > I will test and get the I/O speed results with the following and see what > works best with the given workload: > > Create 5 volumes each with 150 GB in size for the 5 VMs that i will be > running on the server > Create 1 volume with 600GB in size for the 5 VMs that i will be running on > the server > Try with LVM volumes instead of files > > Will test and compare the I/O responsiveness in all cases and go with the > one which is acceptable.Unless you put each VM on its own physical disk or raid1 mirror you aren't really doing anything to isolate the vms from each other or to increase the odds that a head will be near the place the next access needs it to be. -- Les Mikesell lesmikesell at gmail.com
Lol - spinning disks? Really? SSD is down to like 50cents a gig. And they have 1TB disks... slow disks = you get what you deserve... welcome to 2015. Autolacing shoes, self drying jackets, hoverboards - oh, yeah, and 110k IOPS 1TB SamSung Pro 850 SSD Drives for $449 on NewEgg. dumbass -----Original Message----- From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of Les Mikesell Sent: Tuesday, February 03, 2015 12:42 AM To: CentOS mailing list Subject: Re: [CentOS] Very slow disk I/O On Mon, Feb 2, 2015 at 11:37 PM, Jatin Davey <jashokda at cisco.com> wrote:> > I will test and get the I/O speed results with the following and see > what works best with the given workload: > > Create 5 volumes each with 150 GB in size for the 5 VMs that i will be > running on the server Create 1 volume with 600GB in size for the 5 VMs > that i will be running on the server Try with LVM volumes instead of > files > > Will test and compare the I/O responsiveness in all cases and go with > the one which is acceptable.Unless you put each VM on its own physical disk or raid1 mirror you aren't really doing anything to isolate the vms from each other or to increase the odds that a head will be near the place the next access needs it to be. -- Les Mikesell lesmikesell at gmail.com _______________________________________________ CentOS mailing list CentOS at centos.org http://lists.centos.org/mailman/listinfo/centos
Am 03.02.2015 um 10:14 schrieb Joseph L. Brunner:> Lol - spinning disks? Really? > > SSD is down to like 50cents a gig. And they have 1TB disks... slow disks = you get what you deserve... welcome to 2015. Autolacing shoes, self drying jackets, hoverboards - oh, yeah, and 110k IOPS 1TB SamSung Pro 850 SSD Drives for $449 on NewEgg. > > dumbassRight, *consumer grade* SSD prices were coming down thzat much. But I am sure the appliance Jatin is building up (while he uses the @cisco.com mail domain) is intended for enterprise usage and has to have enterprise grade hardware components. Just like he used an enterprise grade HDD (though a SATA and not a SAS model with only 7.2krpm which is, as John pointed out, not a good choice for a virtualization host) to build the machine. Investigate about SSDs made to be used in servers, SLC and not MLC type of chips, SAS interface. Then lets speak again after you have checked their prices. Regards Alexander