Disk Cache

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Disk Cache, which one is better ? (3 Replies, Read 3104 times)

10110	# November 29, 2018, 2:26 pm
Group: Member Post Group: Newbie Posts: 9 Status:	Hi, for a 1TB vps cpanel/plesk hosting which cache do you recommend ? Regards,
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Disk Cache

10110	# November 29, 2018, 3:05 pm \| Post: 1
Group: Member Post Group: Newbie Posts: 9 Status:	i found this article http://www.ilsistemista.net/index.php/virtualization/11-kvm-io-slowness-on-rhel-6.html?start=7 which not recommend default , write-through so there are 3 options: none, write back, direct sync, which one should i use ?
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Disk Cache

bigpowerhosting	# November 30, 2018, 12:30 am \| Post: 2
Group: Member Post Group: Newbie Posts: 6 Status:	Disk Cache set to "writethrough" or "writeback" with IO policy "thread" gives decent VPS disk IO performance. - Use virtio optimized IO performance If you are using CentOS 7, then you will also be able to limit VPS disk I/O speed Edited by bigpowerhosting : November 30, 2018, 12:31 am
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Disk Cache

wolke	# November 30, 2018, 2:25 pm \| Post: 3
Group: NOC Post Group: Elite Member Posts: 437 Status:	If you have more than 1 VM on the node, I recommend "none" as caching and "native" as i/o policy. in fact the i/o mechanism does not really make a big difference in most scenarios. If you only have 1 VM (why the heck?) threads may perform better. Have a look here (beginning with slide 27) for a good comparison: https://www.slideshare.net/pradeepkumarsuvce/qemu-disk-io-which-performs-better-native-or-threads Edited by wolke : November 30, 2018, 2:25 pm
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