similar to: Using compression on SSD

Hi! > [ANNOUNCE] Btrfs v0.9 > [...] > * Stripe size parameter to mkfs.btrfs (-s size_in_bytes). Extents will > be aligned to the stripe size for performance. > [...] http://fixunix.com/kernel/258991-[announce]-btrfs-v0-9-a.html versus > -s, --sectorsize size > Specify the sectorsize, the minimum block allocation. (man mkfs.btrfs with btrfs-tools

Hello ext3 users and developers, I am gathering information for an article about journal filesystems with emphasis on write barrier functionality, how it works, why journalling filesystems need write barrier and the current implementation of write barrier support for different filesystems. Background of this is my own experience of three XFS crashes in one week:

Adding linux-btrfs to Cc. Am Freitag, 27. Januar 2012 schrieb Jeff Moyer: > Hi, Hi, > As it stands, generic_file_aio_write will call into generic_write_sync > when -EIOCBQUEUED is returned from __generic_file_aio_write. > EIOCBQUEUED indicates that an I/O was submitted but NOT completed. > Thus, we will flush the disk cache, potentially before the write(s) > even make it to

Added linux-btrfs and Helmut Hullen, who seemed to experience hangs on a T23 with BTRFS as well, to Cc. Am Thursday 03 February 2011 schrieb Rafael J. Wysocki: > This message has been generated automatically as a part of a report > of regressions introduced between 2.6.36 and 2.6.37. > > The following bug entry is on the current list of known regressions > introduced between

Hi! Today I converted my /home from Ext4 to BTRFS by reformatting and copying all over again. I created the filesystem with -l 16384 -n 16384 -d single -m single on an logical volume Intel SSD 320 and mount with compress=lzo,spacecache. Current state: merkaba:~> btrfs filesystem show failed to read /dev/sr0 Label: ''home'' uuid: […] Total devices 1 FS bytes used

Hi! With 3.2-rc4 (probably earlier), Ext4 seems to remember what areas it trimmed: merkaba:~> fstrim -v /boot /boot: 224657408 bytes were trimmed merkaba:~> fstrim -v /boot /boot: 0 bytes were trimmed But BTRFS does not: merkaba:~> fstrim -v / /: 4431613952 bytes were trimmed merkaba:~> fstrim -v / /: 4341846016 bytes were trimmed Is it planned to add this feature to BTRFS

Martin Steigerwald reported a BUG_ON() where we were given a bogus bytenr to map. Turns out he is using > PAGESIZE leafsizes. The readahead stuff is called every time we do a completion, but we may not have finished reading in all the pages, so the bytenr we read off the node could be completely bogus. Fix this by only calling the readahead hook once all pages have been read in. Thanks,

This article raises the concern that SSD controllers (in particular SandForce) do internal dedup, and in particular that this could defeat ditto-block style replication of critical metadata as done by filesystems including ZFS. http://storagemojo.com/2011/06/27/de-dup-too-much-of-good-thing/ Along with discussion of risk evaluation, it also suggests that filesystems could vary each copy in some

For using SSDs: Are there any format/mount parameters that should be set for using btrfs on SSDs (other than the "ssd" mount option)? General questions: How long is the ''delay'' for the delayed alloc? Are file allocations aligned to 4kiB boundaries, or larger? What byte value is used to pad unused space? (Aside: For some, the erased state reads all 0x00, and for

Interesting flash technology overview and SSD review here: http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3403 and another review here: http://www.tomshardware.com/reviews/Intel-x25-m-SSD,2012.html Regards, -- Al Hopper Logical Approach Inc,Plano,TX al at logical-approach.com Voice: 972.379.2133 Timezone: US CDT OpenSolaris Governing Board (OGB) Member - Apr 2005

I would like to compute the MC test (rfm.test) available in the package MarkedPointProcess (for the data BITOEK for example) in order to test the dependence between the marks and their locations. Why the syntax of rfm.test is false here? I have the message : ****************************** ML WARNING! Forbidden values! -- if there are too many warnings try narrower lower and upper bounds for the

Il 27/10/2016 19:38, Yamaban ha scritto: > On Thu, 27 Oct 2016 11:25, Alessandro Baggi wrote: >> Il 24/10/2016 14:05, Leonard den Ottolander ha scritto: >>> On Mon, 2016-10-24 at 12:07 +0200, Alessandro Baggi wrote: >>> > === START OF READ SMART DATA SECTION === >>> > SMART Error Log not supported >>> >>> I reckon there's a

Hello, I''ve stumbled upon this article: http://storagemojo.com/2011/06/27/de-dup-too-much-of-good-thing/ Reportedly Sandforce SF1200 SSD controller does internally block-level data de-duplication. This effectively removes the additional protection given by writing multiple metadata copies. This technique may be used, or can be used in the future by manufactureres of other drives too. I

Hi everyone, I'm going to install an IAXy in my client's office but there the internet conection has a private IP address, however the Asterisk server has a public IP. Private IP Public IP (IAXy)--------(ISP LAN)-----------((Internet))-----(Asterisk Server) This setup can cause any problems to the comunication process? I'm aware that

I''ve got two recent examples of SSDs. Their pristine state from the manufacturer shows: Device Model: OCZ-VERTEX3 # hexdump -C /dev/sdd 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 1bf2976000 Device Model: OCZ VERTEX PLUS (OCZ VERTEX 2E) # hexdump -C /dev/sdd 00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| *

Are the new SSD disks compatible with centos 5.0? Anybody have one? know where to get one? I think they only come with new laptops. Jerry -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20071127/fc7dbc48/attachment-0005.html>

Hello all, I just bought new Kingston V+ series 128gb to boost Oracle db in DomU instance. How I googled it, there is TRIM commands what introduced to 2.6.28 and more or less working from 2.6.33 kernel... I have old istalation running in PV context on Xen v3.3 with 2.6.24-27-xen kernel on Ubuntu 8.04.4 LTS. My question is, does I need to install newest Xen with latest kernel to get TRIM

Hi all, I received my SSD, and wanted to test it out using fake zpools with files as backing stores before attaching it to my production pool. However, when I exported the test pool and imported, I get an error. Here is what I did: I created a file to use as a backing store for my new pool: mkfile 1g /data01/test2/1gtest Created a new pool: zpool create ziltest2 /data01/test2/1gtest Added the

Hi, I just received a new laptop with a Micron 256GB SSD, and I plan to install Fedora 20 onto it. I'm considering either BTRFS or ext4 (over LUKS-encrypted LVM) for this machine, but I'm afraid BTRFS might generate too much writes and shorten the SSD lifespan... Or am I mistaken ? Is there any pro/cons currently, on a 3.14 kernel, about using BTRFS along with an SSD ? Is there

Hi there, I am trying to read SAS dataset into R and have observed some weird behaviors. Here is my setting. I copied retail.sas7bdat from sashelp and placed it in my test directory C:\Temp. In R, I submitted the following command >read.ssd("C:/Temp", "retail", sascmd="C:/Program Files/SAS/SASFoundation/9.2/sas.exe") The data has been read correctly. But when