I need to replace a slow HP MSA20 that's a bottleneck right now (We are an HP shop). HP's only option with 3.5" SATA drives is stuck at SATA I behind a SAS controller. Dell makes an MD1000 that claims SATA II speeds behind a SAS Perc 5/E (Don't know anything about dell).
Anyone got any real world info they can share? I need 3.5" SATA II at least 12 drives behind SAS, I am not concerned about space and could use multiple 1u chassis if I had to.
Thanks! jlc
Joseph L. Casale schrieb:
I need to replace a slow HP MSA20 that’s a bottleneck right now (We are an HP shop). HP’s only option with 3.5” SATA drives is stuck at SATA I behind a SAS controller.
Dell makes an MD1000 that claims SATA II speeds behind a SAS Perc 5/E (Don’t know anything about dell).
Anyone got any real world info they can share? I need 3.5” SATA II at least 12 drives behind SAS,
I am not concerned about space and could use multiple 1u chassis if I had to.
Promise VTRAK J610sS?
We use it with Solaris and ZFS - I'm not too keen on using LVM on more than a handful of disks. IMO, 16 disks is probably the minimum to get some decent non-linear performance out of SATA.
If you have the money, you can go for a SUN J4500 ;-)
Rainer
Hi,
I assume you're talking about the MSA60? We have several of those installed and haven't seen any bottle necks there. Even the fastest SATA drives fall short of the 150MB/sec max SATA I throughput. And if you could push the 1.5Gb/sec on the SATA side, then the SAS side with a 4x port (4x3Gb/sec) would become your bottleneck.
Peter.
On Tuesday 02 September 2008 11:23:00 am Joseph L. Casale wrote:
I need to replace a slow HP MSA20 that’s a bottleneck right now (We are an HP shop). HP’s only option with 3.5” SATA drives is stuck at SATA I behind a SAS controller. Dell makes an MD1000 that claims SATA II speeds behind a SAS Perc 5/E (Don’t know anything about dell). Anyone got any real world info they can share? I need 3.5” SATA II at least 12 drives behind SAS, I am not concerned about space and could use multiple 1u chassis if I had to. Thanks!
I assume you're talking about the MSA60?
Yup
We have several of those installed and haven't seen any bottle necks there. Even the fastest SATA drives fall short of the 150MB/sec max SATA I throughput. And if you could push the 1.5Gb/sec on the SATA side, then the SAS side with a 4x port (4x3Gb/sec) would become your bottleneck.
Good to know! I think I am actually going to get an MSA50 and go SAS. The cheaper enclosure affords me the chance to get good drives and if the need to expand comes I will just get another, it can be cascaded 1+1 and there are two ports on a P800 so I can hook up 4 of the things.
Thanks, jlc
Joseph L. Casale wrote:
Anyone got any real world info they can share? I need 3.5" SATA II at least 12 drives behind SAS, I am not concerned about space and could use multiple 1u chassis if I had to.
What about this?
http://h18000.www1.hp.com/products/quickspecs/13045_na/13045_na.html
The MSA2000sa is a 2U direct attach, external shared storage solution designed for small to medium size deployments or remote locations. It comes in two models - a basic single controller model for low initial cost with the ability to upgrade later; and a model with dual controllers standard for maximum performance. This solution offers a SAS host nterface to accommodate twelve 3.5 inch enterprise class SAS drives and archival-class SATA drives. Additional capacity can easily be added when needed by attaching up to three MSA2000 12 bay drive enclosures. Maximum raw capacity ranges from 3.6TB SAS or 12TB SATA in the base cabinet, to over 14.4TB SAS or 48TB SATA with the addition of the maximum number of drive enclosures.
This page says it supports SATA II http://h18006.www1.hp.com/storage/disk_storage/msa_diskarrays/san_arrays/ind...
nate
On Tue, Sep 2, 2008 at 8:44 PM, nate centos@linuxpowered.net wrote:
Joseph L. Casale wrote:
Anyone got any real world info they can share? I need 3.5" SATA II at
least
12 drives behind SAS, I am not concerned about space and could use multiple 1u chassis if I had to.
What about this?
http://h18000.www1.hp.com/products/quickspecs/13045_na/13045_na.html
The MSA2000sa is a 2U direct attach, external shared storage solution designed for small to medium size deployments or remote locations. It comes in two models - a basic single controller model for low initial cost with the ability to upgrade later; and a model with dual controllers standard for maximum performance. This solution offers a SAS host nterface to accommodate twelve 3.5 inch enterprise class SAS drives and archival-class SATA drives. Additional capacity can easily be added when needed by attaching up to three MSA2000 12 bay drive enclosures. Maximum raw capacity ranges from 3.6TB SAS or 12TB SATA in the base cabinet, to over 14.4TB SAS or 48TB SATA with the addition of the maximum number of drive enclosures.
This page says it supports SATA II
http://h18006.www1.hp.com/storage/disk_storage/msa_diskarrays/san_arrays/ind...
nate
Sorry for hi-jacking this thread, but it's very interesting. What's the difference, apart from the speed & price between SAS & SATAII?
Sorry for hi-jacking this thread, but it's very interesting. What's the difference, apart from the speed & price between SAS & SATAII?
SAS is more enterprise geared, relating to speed and MTBU (probably a load of crap on that point) and SATA is cheaper and does not perform as well, supposedly less reliable to.
SAS usually only come in higher spindle speeds and the 2.5" variety actually only have 300 Gb ratings.
jlc
Sorry for hi-jacking this thread, but it's very interesting. What's the difference, apart from the speed & price between SAS & SATAII?
SAS is more enterprise geared, relating to speed and MTBU (probably a load of crap on that point) and SATA is cheaper and does not perform as well, supposedly less reliable to.
SAS usually only come in higher spindle speeds and the 2.5" variety actually only have 300 Gb ratings.
SAS supports proper multiplexor technology, and multichannel bonding... a typical external SAS connector has FOUR sas channels, and the multiplexor in a drive chassis can connect any drive to any channel at any time, while SATA only supports simple expanders (1 channel to N drives). SAS understands NCQ natively, while this was a kludge added to SATA (and, from various field reports, not very well).
On Tue, Sep 2, 2008 at 5:01 PM, Joseph L. Casale JCasale@activenetwerx.com wrote:
Sorry for hi-jacking this thread, but it's very interesting. What's the difference, apart from the speed & price between SAS & SATAII?
SAS is more enterprise geared, relating to speed and MTBU (probably a load of crap on that point) and SATA is cheaper and does not perform as well, supposedly less reliable to.
There was a thread about the MTBF of various types of drives, linking to articles about the experiences of Google.com, here in this mailing list, probably 1 or 2 years ago. As I recall, they found the MTBF between different types of drives to be about the same?
SAS usually only come in higher spindle speeds and the 2.5" variety actually only have 300 Gb ratings.
There was a thread about the MTBF of various types of drives, linking to articles about the experiences of Google.com, here in this mailing list, probably 1 or 2 years ago. As I recall, they found the MTBF between different types of drives to be about the same?
That's exactly what I was referencing when I said the MTBF was probably BS. Its been my experience as well, I have super cheap SATA drives running in a very busy iSCSI array storing DVR data that's being written to at a fairly high rate consistently and the thing just wont quit...
jlc
Rudi Ahlers wrote:
Sorry for hi-jacking this thread, but it's very interesting. What's the difference, apart from the speed & price between SAS & SATAII?
On the most basic level I think of SAS as basically the new SCSI, and SATA II as the new PATA.
SCSI = smaller, faster SATA II = bigger, slower
SAS drives typically have higher quality control on them too. I get the impression that a lot more firmware bugs get out on the SATA drives vs the SAS/FC drives. Though the only time I've ever had to upgrade the firmware on a disk drive was regular U320 SCSI disks from Seagate sold via Dell.
nate
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Rudi Ahlers