Mailinglist Archive: opensuse-features (93 mails)

< Previous Next >
[openFATE 311341] Yast Partitioning give SSD best practice option
Feature changed by: Stanley Miller (stan_qaz)
Feature #311341, revision 11
Title: Yast Partitioning give SSD best practice option

openSUSE Distribution: Unconfirmed
Priority
Requester: Desirable

Info Provider: Hans de Raad (hcderaad)
Requested by: Hans de Raad (hcderaad)
Partner organization: openSUSE.org

Description:
More and more laptops, netbooks, pc's, servers, actually anything with
some kind of storage need is equipped with Solid State Disks. Although
at first glance they may seem quite similar to harddisks, they really
are a completely different species with some very different
characteristics.
It might be convenient for having an "SSD Best practise enabler" switch
when creating partitions on disks in Yast, which would then
automatically setup the features (and possibly others) mentioned in the
"Why do we want this" part of this feature.

Use Case:
During installation (or partition editing) when a user configures a
partition, the option would be presented to enable SSD Best practises.

Business case (Partner benefit):
openSUSE.org: Especially in the partitioning stage of the installation
process one can make or break the extra performance one might gain from
using SSD's. Especially aligning a filesystem to SSD erase block size
and enabling TRIM on partitions are really noticeable performance
enhancers. Also, when the SSD option is activated, the Swap partition
would be suggested to be removed from the partition setup (if one is
set).

Discussion:
#1: Arvin Schnell (aschnell) (2011-02-23 03:36:05)
Parted (used by the YaST partitioner) already respects the alignment
information provided by disks.
Not having a swap partition disallowes suspend to disk, an essential
feature on mobile devices.
What detailed actions should be taken concerning the TRIM command?

#2: Hans de Raad (hcderaad) (2011-02-23 13:07:59) (reply to #1)
Concerning TRIM there already is some detailed info on the wiki:
http://en.opensuse.org/SDB:SSD_discard_%28trim%29_support The swap
option might be a bit farfetched but netbooks like the Acer Aspire One
discouraged the use of swapping because of the lifetime of the ssd
(will look for citation). I didnt know about the alignment in Yast, but
the biggest benefit should be gained from automatically mount SSD
partitions with TRIM enabled. (ie
https://sites.google.com/site/lightrush/random-1/howtoconfigureext4toenabletrimforssdsonubuntu
) Does this answer your quetion sufficiently?
Regards and thanks for your answer, HdR

#3: Arvin Schnell (aschnell) (2011-02-23 14:49:21) (reply to #2)
Yes, but the kernel/tools don't look mature yet.

#4: Hans de Raad (hcderaad) (2011-02-25 11:55:53) (reply to #3)
Again thanks for responding. I dont have enough specific kernel/ext4
knowledge comment on the maturity of the tools, this function seems to
be in testing phase in the kernel
(http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.36 look for
ext4). The wiper.sh script does make a difference for my system with an
OCZ Vertex II (i dont have hard benchmarks but the overall
responsiveness is definitely better after a monthly wipe).
Perhaps we can offer the option at the moment its considered stable in
a future release?

#5: Will Stephenson (wstephenson) (2011-02-28 16:31:04) (reply to #1)
TRIM: we can mount ext4 with the discard option, then the filesystem
TRIMs deleted files. James Bottomley says in #suse that this is
probably the worst performing way to do this, but is it still better
than no TRIM at all on a default install?
Swap: the sensitivity to write bandwidth seems to improve for newer
generations of SSDs; perhaps it is no longer critical to avoid using
swap on SSD. Some recommend tuning kernel swappiness parameters - taken
to an extreme a swap partition would only be used for s2disk. Others
recommend putting /tmp on a tmpfs, and /var/ and even /home on spinning
disks instead of the SSD.
The steps I took on my recent SSD install were:
* mount ext4 with noatime,discard so deleted files are TRIMmed and
returned to free space
* align partitions to erase block boundaries (not sure if this has any
effect as long as things are not writing to the last/first sectors that
might otherwise span erase blocks)
* use elevator=noop for the SSD as cfq is said to be counterproductive
* swap on a spinning disk


#6: Jedi Beeftrix (jedibeeftrix) (2011-03-01 10:28:57) (reply to #5)
will 11.4 do this for me automatically if it detects (or if i state
that it has) an SSD?
cheers

#7: Hans de Raad (hcderaad) (2011-03-25 09:19:23)
Since upgrading to (the wonderful!) openSUSE 11.4 release i started
receiving error notifications by the GNOME Disk Utility (apparantly my
almost shiny new OCZ Vertex II has a lot of bad sectors). I did some
googling and found some interesting results:
http://www.google.nl/search?q=red+hat+disk+utility+ssd+bad+sectors
Apparantly SSD's can handle "bad" sectors a lot better than normal
spinning disks, therefor threshold values should also be adapted to SSD
values, when enabling the requested feature.

+ #8: Stanley Miller (stan_qaz) (2013-02-23 19:00:31)
+ It has been a long time hoping for action on this suggestion while more
+ and more folks are getting SSDs. Getting the proper options into
+ OpenSuse for an SSD is not an easy task and it would be a big
+ improvement to have that automated as much as possible. See also
+ feature 312476 https://features.opensuse.org/312476
+ And bug report 777450
+ https://bugzilla.novell.com/show_bug.cgi?id=777450




--
openSUSE Feature:
https://features.opensuse.org/311341

< Previous Next >
This Thread
  • No further messages