RE: [PATCH] scsi: sd: stop SSD (non-rotational) disks before reboot

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

 



From: Pavel Machek
> Sent: 02 July 2020 22:17
> > > during a FLASH write or erase can cause from weakened cells, to much
> > > larger damage.  It is possible to harden the chip or the design against
> > > this, but it is *expensive*.  And even if warded off by hardening and no
> > > FLASH damage happens, an erase/program cycle must be done on the whole
> > > erase block to clean up the incomplete program cycle.
> >
> > It should have been SSD's(including FW) responsibility to avoid data loss when
> > the SSD is doing its own BG writing, because power cut can happen any time
> > from SSD's viewpoint.
> 
> It should be their responsibility. But we know how well that works
> (not well), so we try hard (and should try hard) to power SSDs down
> cleanly.

I hope modern SSD disks are better than very old CF drives.

I had one where the entire contents got scrambled after an unexpected
power removal.
I suspect it was in the middle of a 'wear levelling' activity.
Even though it was only a FAT filesystem I was glad I didn't
actually need to recover any of the data.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]

  Powered by Linux