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I have a 24 x 1TB system being used as an NFS file server. Seagate SAS disks connected via an LSI 9211-8i SAS controller, disk layout 2 x 11 disk RAIDZ2 + 2 spares. I am using 2 x DDR Drive X1s as the ZIL. When we write anything to it, the writes are always very bursty like this: ool 488K 20.0T 0 0 0 0 xpool 488K 20.0T 0 0 0 0 xpool

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 coul...

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 would like to ask, if the metadata...

...Aside: For some, the erased state reads all 0x00, and for others the erased state reads all 0xff.) Background: I''ve got a mix of various 120/128GB SSDs to newly set up. I will be using ext4 on the critical ones, but also wish to compare with btrfs... The mix includes some SSDs with the Sandforce controller that implements its own data compression and data deduplication. How well does btrfs fit with those compared to other non-data-compression controllers? Regards, Martin -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majo...

I recently got a new SSD (ocz vertex LE 50gb) It seems to work really well as a ZIL performance wise. My question is, how safe is it? I know it doesn''t have a supercap so lets'' say dataloss occurs....is it just dataloss or is it pool loss? also, does the fact that i have a UPS matter? the numbers i''m seeing are really nice....these are some nfs tar times before

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 |................| *

I''m running a mirrored pair of 2 TB SATA drives as my data storage drives on my home workstation, a Core i7-based machine with 10 GB of RAM. I recently added a sandforce-based 60 GB SSD (OCZ Vertex 2, NOT the pro version) as an L2ARC to the single mirrored pair. I''m running B134, with ZFS pool version 22, with dedup enabled. If I understand correctly, the dedup table should be in the L2ARC on the SSD, and I should have enough RAM to keep the references to...

...ndicated time to expire, then check the output of >> smartctl -a (or -x) again. >> >> Regards, >> Leonard. >> > Hi Leonard, > after a smart short test, the output of smartctl -a /dev/... is > > === START OF INFORMATION SECTION === > Model Family: SandForce Driven SSDs > Device Model: Corsair Force GT > Serial Number: 12297948000015020A81 > LU WWN Device Id: 0 000000 000000000 > Firmware Version: 5.02 > User Capacity: 120,034,123,776 bytes [120 GB] > Sector Size: 512 bytes logical/physical > Rotation Rate: Solid...

Hi, 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 <snip> between those lines. The line right after the first should read something like: SMART overall-health self-assessment test result: PASSED or "FAILED" for that matter. If not try running smartctl -t short

...output of >>> smartctl -a (or -x) again. >>> >>> Regards, >>> Leonard. >>> >> Hi Leonard, >> after a smart short test, the output of smartctl -a /dev/... is >> >> === START OF INFORMATION SECTION === >> Model Family: SandForce Driven SSDs >> Device Model: Corsair Force GT >> Serial Number: 12297948000015020A81 >> LU WWN Device Id: 0 000000 000000000 >> Firmware Version: 5.02 >> User Capacity: 120,034,123,776 bytes [120 GB] >> Sector Size: 512 bytes logical/physical >...

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

Now the test for the Vertex 2 Pro. This was fun. For more explanation please see the thread "Crucial RealSSD C300 and cache flush?" This time I made sure the device is attached via 3GBit SATA. This is also only a short test. I''ll retest after some weeks of usage. cache enabled, 32 buffers, 64k blocks linear write, random data: 96 MB/s linear read, random data: 206 MB/s linear

...sion make sense on SSD? Or more specifically: 1) In what chunk sizes does BTRFS compress? How much data is affected when a byte is changed in a 2 GB file or so? Can compression cause more writes to the SSD in extreme circumstances? 2) It also seems to depend on the SSD. I found mention that the SandForce controller does on-thy-fly compression under the hood and that compressing the files in Linux could cause more harm than good then[1]. 3) Finally would zlib or lzo compression be better? I bet that at least mostly depends on the CPU speed. My current conclusion for the root filesystem on the...

Are there any drawbacks to partition a SSD in two parts and use L2ARC on one partition, and ZIL on the other? Any thoughts? -- This message posted from opensolaris.org

...ctl -t short /dev/sda > > , wait for the indicated time to expire, then check the output of > smartctl -a (or -x) again. > > Regards, > Leonard. > Hi Leonard, after a smart short test, the output of smartctl -a /dev/... is === START OF INFORMATION SECTION === Model Family: SandForce Driven SSDs Device Model: Corsair Force GT Serial Number: 12297948000015020A81 LU WWN Device Id: 0 000000 000000000 Firmware Version: 5.02 User Capacity: 120,034,123,776 bytes [120 GB] Sector Size: 512 bytes logical/physical Rotation Rate: Solid State Device Device is: In...

I have a 50 gig OCZ Vertex LE drive that needs a firmware update. When I run the Windows only flash program in wine it doesnt see the SATA ssd drive it needs to flash. I have booted off another hard disk. I need administrator privileges to see the drive so I config'd wine for win98. I also tried to manually add the drive in wine config by adding the /media/xxxx path and also manually

Hello all, I am thinking about a new laptop. I see that there are a number of higher-performance models (incidenatlly, they are also marketed as "gamer" ones) which offer two SATA 2.5" bays and an SD flash card slot. Vendors usually position the two-HDD bay part as either "get lots of capacity with RAID0 over two HDDs, or get some capacity and some performance by mixing one

Hi list, I don''t trust theoretical benchmarks that much and prefer "real-life benchs" on the occasion, so here''s mine: Given 4 laptops, the most powerful of which was running BTRFS and the others ext3 or ext4, all machines running Ubuntu 11.04 Natty 32-bit with a stock Ubuntu 2.6.38-11 kernel, all machines were given the following FS-intensive task : - Upgrade

Here are patches to do offline deduplication for Btrfs. It works well for the cases it''s expected to, I''m looking for feedback on the ioctl interface and such, I''m well aware there are missing features for the userspace app (like being able to set a different blocksize). If this interface is acceptable I will flesh out the userspace app a little more, but I believe the