Re: TRIM / UNMAP read response

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 11-08-12 09:28 AM, joystick wrote:
Hi all IDE and SCSI ml's,

is it guaranteed by the standards that reading from a device a region that has
been TRIMmed (IDE) or UNMAPped (SCSI) will certainly return zeroes?

ATA:
In 'hdparm -I' you need to see this line:
   *  Deterministic read ZEROs after TRIM
[See the ATA IDENTIFY DEVICE command]

SCSI:
In the READ CAPACITY (16) response the LBPRZ needs to
be set to 1. Recently the same LBPRZ bit was added to
the Logical Block Provisioning VPD page (sbc3r27.pdf).

Doug Gilbert
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Filesystems]     [Linux SCSI]     [Linux RAID]     [Git]     [Kernel Newbies]     [Linux Newbie]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Samba]     [Device Mapper]

  Powered by Linux