similar to: Windows DomU with SSDs

Hi, My shop is a long time (~2006) ZFS user, considering moving off OpenSolaris due to a number of non-technical issues. We use ZFS for all of our MySQL databases. It''s cheap/fast snapshots are critical to our backup strategy, and we rely on the L2ARC and dedicated log device (i.e. NVRAM) features to accelerate our pools with SSDs. I''ve read through the archives for comments on

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I''ve been unable to find anything definitive about what happens if I use RAID0 to join an SSD and HDD together with respect to performance (latency, throughput). The future is obvious (hot data tracking, using most appropriate device for the data, data migration). In my specific case I have a 250GB SSD and a 500GB HDD, and about 250GB of

On 13 September 2017 at 12:00, hw <hw at gc-24.de> wrote: >> >> It will depend on the type of SSD. Ones with large cache and various >> smarts (SAS Enterprise type) can take many different sizes. For SATA >> ones it depends on what the cache and write of the SSD is and very few >> of them seem to be the same. The SSD also has all kinds of logic which >>

Stephen John Smoogen wrote: > On 13 September 2017 at 09:25, hw <hw at gc-24.de> wrote: >> John R Pierce wrote: >>> >>> On 9/9/2017 9:47 AM, hw wrote: >>>> >>>> >>>> Isn?t it easier for SSDs to write small chunks of data at a time? >>>> The small chunk might fit into some free space more easily than >>>> a

On 13 September 2017 at 09:25, hw <hw at gc-24.de> wrote: > John R Pierce wrote: >> >> On 9/9/2017 9:47 AM, hw wrote: >>> >>> >>> Isn?t it easier for SSDs to write small chunks of data at a time? >>> The small chunk might fit into some free space more easily than >>> a large one which needs to be spread out all over the place.

Processing commands for control at bugs.debian.org: > user debian-qa at lists.debian.org Setting user to debian-qa at lists.debian.org (was anbe at debian.org). > tags 714794 - moreinfo Bug #714794 {Done: Gilles Filippini <pini at debian.org>} [release.debian.org] pu: package sikuli/1.0~x~rc3.tesseract3-dfsg1-5+deb7u1 Removed tag(s) moreinfo. > tags 710035 - moreinfo Bug #710035

Hi, I was just wondering if there are specific steps to take to install CentOS on SSDs... By example, no swap partition? Format with a flash fs? Sysctl parameters? Thx, JD

John R Pierce wrote: > On 9/9/2017 9:47 AM, hw wrote: >> >> Isn?t it easier for SSDs to write small chunks of data at a time? >> The small chunk might fit into some free space more easily than >> a large one which needs to be spread out all over the place. > > > the SSD collects data blocks being written and when a full flash block worth of data is collected,

Hi all, are there any plans that future versions of mkfs.btrfs will do an initial pre-discard for SSDs? (AFAIK mkfs.btrfs does not do this currently) For Ext4, mke2fs does this with the -E discard option. From the mke2fs manpage: -E discard Attempt to discard blocks at mkfs time (discarding blocks initially is useful on solid state devices and sparse / thin-provisioned storage). When

Here is a short proposal for the hybrid storage cache idea with introduction/motivation and a bird''s eye view of an approach to implement a hybrid storage cache for btrfs. Please note that there is currently no available patches. We would like to get as much input before as possible before we start designing and implementing a solution. 1. Introduction The emerge of Solid State

Does BTRFS perform any journal and/or filesystem structure alignment (for benefit to SSD longevity and SSD, RAID array and large-sector device performance) at present? ext4''s Ted Tso will deliver 128KB alignment with the next release of e2fsprogs (ie 1.41.4) [1], so perhaps it''s a good idea for btrfsprogs also, if not already available? Daniel --- [1]

Hi Everyone, How does one install Ubuntu 10.04 DomU in PV mode when running Xen 4.0? My Dom0 is also running 10.04. Can I still use the CD? Thanks _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

Hi Everyone, I upgraded my CentOS 5.5 to Xen 3.4.2 using this guide: http://www.syntaxtechnology.com/2010/01/upgrade-xen-3-0-on-centos-5-4-x86_64-to-xen-3-4-2/ Now, using the new kernel that it gave me, the system doesn''t seem to be able to detect vt-x.. In virt-manager, Local Install Media and Network Boot are greyed out.. Any ideas? Thanks

Hi, Has, or does, anyone use dm-cache - specifically for caching SAN based storage locally? I''m looking for a way to speed up SAN based storage on a CentOS 5.6 + XEN Hypervisor which uses iSCSI mounted SAN storage. dm-cache seems like it do the trick, but I''ve never heard of it before until someone mentioned it in another mailing list. A quick search on google didn''t

Processing commands for control at bugs.debian.org: > severity 813678 serious Bug #813678 [blktap-dkms] blktap-dkms: fails to build with mainline 4.4 based kernels Severity set to 'serious' from 'important' > severity 813037 serious Bug #813037 [src:flashcache] flashcache: will not build against mainline 4.4 based kernels Severity set to 'serious' from

Hi, When I login to a Ubuntu 10.04 virtual machine instance running in Xen through SSH, the console''s lines are clipped at the middle section of my 15.6" screen. I''ll be glad if somebody can suggest a fix. This is turning out to be very annoying. Thanks, Kowshik _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com

On 9/13/2017 9:21 AM, Stephen John Smoogen wrote: > ...The SATA hard drives....[It doesn't matter the brand.. they get built with the same tech and at the same place these days.] thats most assuredly not true.?? HD manufacturing is extremely competitive, there's no WAY they 'are built at the same place'. Each of the few remaining major brands of HD's has their own

On Wed, September 13, 2017 2:16 pm, John R Pierce wrote: > On 9/13/2017 9:21 AM, Stephen John Smoogen wrote: >> ...The SATA hard drives....[It doesn't matter the brand.. they get built >> with the same tech and at the same place these days.] > > > thats most assuredly not true.???? HD manufacturing is extremely > competitive, there's no WAY they 'are built at

Hi Everyone, In Xen, is a DomU able to access data in RAM which a previous DomU has stored in the past, but didn''t "zero" it? I understand that this is a problem with physical disks (using phy:/), just wondering if the same stands with RAM Thanks _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com

Hi Everyone, In Xen, is a DomU able to access data in RAM which a previous DomU has stored in the past, but didn''t "zero" it? I understand that this is a problem with physical disks (using phy:/), just wondering if the same stands with RAM Thanks _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com