On 28 January 2017 at 10:13, Sitsofe Wheeler <sitsofe@xxxxxxxxx> wrote: > Hi, > > On 28 January 2017 at 01:05, Rebecca Cran <rebecca@xxxxxxxxxxxx> wrote: >> I've been looking at the TRIM support in Windows 8 and newer, and have come >> across a potential problem. Other OSes use TRIM on a physical/block device, >> but Windows only provides support for TRIM on files. > > What happens when using Hyper-V with raw disks that support thin > provisioning? Is there some secret kernel only method that converts > guest requests to the appropriate ATA/SCSI command in that case? > > (https://msdn.microsoft.com/en-us/windows/hardware/drivers/storage/thin-provisioning > wasn't much help) https://msdn.microsoft.com/en-us/library/windows/hardware/dn653576(v=vs.85).aspx hints that "applications should use the DSM IOCTLs to perform UNMAP/TRIM" but I've read elsewhere that "[DeviceDsmAction_Trim] is not supported for user-mode applications" - https://msdn.microsoft.com/en-us/library/windows/desktop/ee907416(v=vs.85).aspx . -- Sitsofe | http://sucs.org/~sits/ -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
