I''m considering adding a l2arc to my home system and was wondering if anyone had recommendations. I''ve also considered slicing the drive and using it for a zil and l2arc, but I don''t think that my workload would really benefit from a zil. I''m running a few VMs and serving up content via CIFS mostly. I have dedup enabled, and the slow writes (presumably from the DDT getting too large) has pushed me toward using a l2arc. I''ve got an 8 drive raidz2 pool, with ~ 3TB currently allocated. The server has 8gb of memory. I''m not sure how much l2arc I need to hold the DDT, but I imagine 30gb is enough. The drives I''m considering are: OCZ Vertex 30GB Intel X25V 40GB Crucial CT64M225 64GB The OCZ drive uses the Indilinx Barefoot controller and Intel 34nm MLC. From what I''ve read, it performs very close the the Vertex drives of similar capacity. The Intel is based on their controller and Intel 34nm MLC. Write performance is crippled compared to the "real" Intel drives, but reads still seem good. The Crucial drive is based on the Indilinx Barefoot controller and Samsung NAND. It should have performance on par with other Indilinx devices. The OCZ looks like the best deal right now at $129, with a $40 rebate. The Intel is $129, and the Crucial is $189. -B -- Brandon High : bhigh at freaks.com
On Fri, Feb 26, 2010 at 2:43 PM, Brandon High <bhigh at freaks.com> wrote:> <snip> > The drives I''m considering are: > > OCZ Vertex 30GB > Intel X25V 40GB > Crucial CT64M225 64GB >Personally, I''d go with the Intel product...but save a few more pennies up and get the X-25M. The extra boost on read and write performance is worth it. -marc -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100226/07ec0f2b/attachment.html>
I use the Intel X25-V and I like it :) Actuall I have 2 in a striped setup. 40 MB Write / Sec (just enought for ZIL filling) something like 130 MB / sec reads. Just enough. -- This message posted from opensolaris.org
> with the Intel product...but save a few more pennies > up and get the X-25M. The extra boost on read and > write performance is worth it.Or use multiple X25-V (L2ARC is not filled fast anyhow, so write does not matter). You can get 4 of them for 1 160 GB X25-M. With 4 X25-V you get ~500 MB /sec instead of ~ 140 MB / sec with the X25-M - much better value for the same price :) -- This message posted from opensolaris.org
On Fri, Feb 26, 2010 at 12:24 PM, Lutz Schumann <presales at storageconcepts.de> wrote:> Or use multiple X25-V (L2ARC is not filled fast anyhow, so write does not matter). You can get 4 of them for 1 160 GB X25-M. With 4 X25-V you get ~500 MB /sec instead of ~ 140 MB / sec with the X25-M - much better value for the same price :)I''m aware that write performance is less of an issue, which is why I''m not concerned with using a device with slower write performance like the X25-V. I''m unlikely to add more than one device to the l2arc anytime soon, either. If I do use two devices, I''d be at $180 vs. $260. The Indilinx controllers support garbage collection when they''re idle, which may help performance as well. -B -- Brandon High : bhigh at freaks.com