Alberto García

O Grove (Spain)

One of the founding members of Igalia, Alberto loves computing since he got his first ZX Spectrum in the early nineties.

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Alberto García 16/11/2017

“Improving the performance of the qcow2 format” at KVM Forum 2017

I was in Prague last month for the 2017 edition of the KVM Forum. There I gave a talk about some of the work that I’ve been doing this year to improve the qcow2 file format used by QEMU for storing disk images. The focus of my work is to make qcow2...

Alberto García 08/02/2017

QEMU and the qcow2 metadata checks

When choosing a disk image format for your virtual machine one of the factors to take into considerations is its I/O performance. In this post I’ll talk a bit about the internals of qcow2 and about one of the aspects that can affect its performance...

Alberto García 24/05/2016

I/O bursts with QEMU 2.6

QEMU 2.6 was released a few days ago. One new feature that I have been working on is the new way to configure I/O limits in disk drives to allow bursts and increase the responsiveness of the virtual machine. In this post I’ll try to explain how it...

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quorum: Forbid adding children in blkverify mode

quorum: Forbid adding children in blkverify mode The blkverify mode of Quorum only works when the number of children is exactly two, so any attempt to add a new one must return an error. quorum_del_child() on the other hand doesn't need any...

Alberto García05/11/2018

iotest: Test the blkverify mode of the Quorum driver

iotest: Test the blkverify mode of the Quorum driver Signed-off-by: Alberto Garcia Signed-off-by: Kevin Wolf

Alberto García05/11/2018

quorum: Return an error if the blkverify mode has invalid settings

quorum: Return an error if the blkverify mode has invalid settings The blkverify mode of Quorum can only be enabled if the number of children is exactly two and the value of vote-threshold is also two. If the user tries to enable it but the other...

Alberto García05/11/2018

quorum: Remove quorum_err()

quorum: Remove quorum_err() This is a static function with only one caller, so there's no need to keep it. Inlining the code in quorum_compare() makes it much simpler. Signed-off-by: Alberto Garcia Reported-by: Markus Armbruster Signed-off-by:...

Alberto García05/11/2018

qcow2: Get the request alignment for encrypted images from QCryptoBlock

qcow2: Get the request alignment for encrypted images from QCryptoBlock This doesn't have any practical effect at the moment because the values of BDRV_SECTOR_SIZE, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE and QCRYPTO_BLOCK_QCOW_SECTOR_SIZE are all the same...

Alberto García05/11/2018