[ale] Realigning a partition with data

Tue Apr 25 16:00:07 EDT 2017

Maybe a time warp?  The page I referenced has it as April 29 2017
10:00-19:00 and April 30 2017 10:00 -17:00. Alas, Inman Park Festival is
also that weekend. I'm still trying to figure my schedule.

-- CHS

On Mon, Apr 24, 2017 at 8:26 PM, Joey Kelly <joey at joeykelly.net> wrote:

> On 04/24/2017 11:02 AM, Charles Shapiro wrote:
> > Atlanta Vintage Computer Festival is this weekend. ( https://atlhcs.org/
> ).
>
> Hrm? The webpage says it was 3 weeks ago? Or did I accidentally trip
> through a time warp?
>
> --Joey
>
> >
> > -- CHS
> >
> >
> > On Sun, Apr 23, 2017 at 4:45 PM, Alex Carver <agcarver+ale at acarver.net
> > <mailto:agcarver+ale at acarver.net>> wrote:
> >
> >     In this case the old drive was MSDOS partition with 512b blocks so
> it's
> >     not 4k aligned.  The file system itself is ext2.  When I imaged the
> old
> >     drive with ddrescue, I pulled the entire drive in so I'd have the
> boot
> >     sector and the primary partition (there was only two partitions on
> the
> >     original drive and one was swap).  I killed off the swap partition
> then
> >     stretched out the main partition a bit to accommodate the contents
> of a
> >     second drive that was installed (single partition as well).  I was
> more
> >     concerned about the block erasing during TRIM in the SSD with
> unaligned
> >     sectors.
> >
> >     It's mainly used as the network syslog server to record all the logs
> >     from various network devices (cameras, phones, etc.), some data
> logging
> >     from remote sensors (database), plus I do some internal web
> applications
> >     with it.  Not really heavy usage.
> >
> >     I've got plenty of old machines floating around with 5.25 floppies or
> >     other storage media.  :)  In rough order of age of all my functional
> >     machines:
> >
> >     Timex Sinclair (tape drive from a TRS-80 is floating around though
> the
> >     TRS-80 is no longer here)
> >     [Used to have a NorthStar branded CP/M machine with hard-sector 5.25
> >     floppies and integrated green screen -- I taught myself dBase III on
> it
> >     and cataloged all my electronic parts with it.  It's long gone but it
> >     was functional]
> >     Emerson branded 80286 (this became a modem server though it needs
> >     fixing up)
> >     NeXT slab
> >     2x Sun IPXes with external enclosures (one of them is my network GPS
> >     clock)
> >     Unbranded (from parts) 386DX with 387 coproc
> >     Packard Bell branded 486SX (now with a 486DX2/66 chip)
> >     Unbranded Pentium II 266 (for experiments)
> >     4x Sun Enterprise 220Rs with dual UltraSPARC II processors (lots of
> >     experiments)
> >     1x Sun SparcStation 20 (RAID server using 2 Sun A1000 arrays)
> >     Unbranded AMD K6 (the topic of conversation)
> >     Toshiba Satellite 1900 series laptop
> >     Averatec laptop
> >     Unbranded Pentium 4 (previous desktop)
> >     3x Raspberry Pi B+
> >     Unbranded Core i7-3770 Ivy Bridge (current desktop)
> >
> >     On 2017-04-23 13:10, DJ-Pfulio wrote:
> >     > I don't think alignment matters on SSDs. They are so fast.
> >     >
> >     > I've done this with gparted, but always made a full partition
> backup
> >     > using fsarchiver first.  Didn't need the backup, but ... I'm pretty
> >     > experienced with the tools.
> >     >
> >     > Also, the underlying file system matters.  XFS/btrfs seem to have
> the
> >     > most issues.  EXT3/4 seem to be well supported for things like
> >     this.  IMHO.
> >     >
> >     > gparted and parted have always handled alignment issues. I heard
> that
> >     > fdisk started sometime after they added GPT support (whenever that
> >     was).
> >     > I've never used gdisks after seeing all the problems people had
> >     with it.
> >     >  Heard that fdisk is safe on GPT again, for the latest distros.
> >     >
> >     > I have a K2/200 around here somewhere. Keep it for the 5.25in
> floppy.
> >     > Never know when that will be needed again.  That machine also has
> an
> >     > Adaptec 2940u SCSI card. ;)
> >     >
> >     > On 04/23/2017 02:56 PM, Alex Carver wrote:
> >     >> True, I just wondered if there was a way given that
> parted/resize2fs
> >     >> both worked pretty well with data on a partition (I ddrescue'd
> >     the old
> >     >> drive to the SSD then grew the partition).
> >     >>
> >     >> However, after running a couple I/O tests on the drive I'm not
> >     going to
> >     >> bother with the realignment.  I'm getting read speeds of about 160
> >     >> MB/sec and write speeds of 116 MB/sec.  Given the age of the
> machine
> >     >> that's pretty good (AMD K6 with a PCI SATA card and SATA SSD to
> >     replace
> >     >> the on-board IDE and old Maxtor drives)
> >     >>
> >     >> On 2017-04-23 05:04, Jim Kinney wrote:
> >     >>> I would not consider realignment safe with data on the sectors
> >     that are soon to
> >     >>> be outside the partition.
> >     >>>
> >     >>> On Apr 23, 2017 2:00 AM, "Alex Carver" <agcarver+ale at acarver.net
> >     <mailto:agcarver%2Bale at acarver.net>
> >     >>> <mailto:agcarver%2Bale at acarver.net
> >     <mailto:agcarver%252Bale at acarver.net>>> wrote:
> >     >>>
> >     >>>     Just swapped out a spinning drive for an SSD but I probably
> >     need to
> >     >>>     realign the partitions.  Currently everything is in one
> >     partition at the
> >     >>>     start of the disk but it's on sector 63.  I can pop the disk
> >     out and
> >     >>>     plug it into another machine to do this but I'd like to
> >     slide the
> >     >>>     partition over to the right spot (assuming this doesn't
> >     affect the boot
> >     >>>     process).  I haven't found a way to do this as nearly every
> >     page I find
> >     >>>     talks about having parted align new partitions but not those
> >     that have data.
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>
> --
> Joey Kelly
> Minister of the Gospel and Linux Consultant
> http://joeykelly.net
> 504-239-6550
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