Serial Attached SCSI (SAS) is a computer bus used to move data to and from computer storage devices such as hard drives and tape drives. SAS depends on a point-to-point serial protocol that replaces the parallel SCSI bus technology that first appeared in the mid 1980s in data centers and ...

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8
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2answers
492 views

Are branded backplanes useable without specific controllers?

I can't find a disk enclosure which I like, so I'm going to build a custom one (if nothing else, that'll teach me to be picky...). I've got a few HP SAS backplanes lying about, but I'm wondering if ...
0
votes
2answers
559 views

HP P411 Storage Controller not recognized during boot

it's me again :( I've asked a question here a few minutes ago ( HP B110i controller not seeing storage array. Any ideas? ) Turns out I was wrong, and there IS a P411 controller built in, I verified ...
0
votes
3answers
2k views

HP B110i controller not seeing storage array. Any ideas?

We got a new HP ProLiant DL160G6 with internal P410 SAS controller, and an additional B110i SAS controller with external ports that is supposed to connect to the HP Storageworks D2600 Drive Array we ...
3
votes
3answers
5k views

So you really can push a SATA2 disk into a SAS backplane?

There's only one SAS, right? Serial attached SCSI? The female connectors: SATA2 looks like: ------------| |------- And SAS looks : ------------+-+------- For me, the SATA2 male connector looks ...
0
votes
1answer
244 views

ATTO SAS-attached RAID 5 array performance issues on Server 2003

We have an ATTO R380 SAS RAID controller in a Windows Server 2003 HP DL-160 server with 8 700GB Seagate 7200.12 drives. It's configured as a RAID 5 array. ATTO Config says all drives are healthy and ...
-1
votes
1answer
145 views

IBM EXP3000 SAS rack

A couple of weeks ago one of my EXP3000 SAS Racks was not found by the server. Also, all the Amber fault LED lit, on every disk. Today, this also happened on my other EXP3000 after a reboot - Could ...
0
votes
2answers
652 views

Rule of thumb: SATA for storage & serving static content, SSD/SAS for databases?

The question says it all. But, is it true? Can someone explain what's the differentiating factor here (how one type of disk is better than another for a specific purpose)? (FYI, I've tried searching, ...
76
votes
8answers
9k views

How can a single disk in a hardware SATA RAID-10 array bring the entire array to a screeching halt?

Prelude: I'm a code-monkey that's increasingly taken on SysAdmin duties for my small company. My code is our product, and increasingly we provide the same app as SaaS. About 18 months ago I moved ...
2
votes
3answers
1k views

SATA Raid 10 vs SAS Raid 1

I need to setup a small dedi for a few VPS. Obviously the more IO, the merrier. Given these condition, what would you choose? 2 SAS 15k disks in Raid1, or 4 SATA 7.2k in raid 10? Would the answer ...
1
vote
2answers
553 views

Can we “add” more SAS ports to an existing backplane?

We have a 3U Supermicro chassis with 16 bays on a SAS expander backplane. We have 15 of the bays occupied with hard drives at the moment. We would like to add two more drives to the backplane, but we ...
2
votes
2answers
636 views

SAS drive to SAS/SATA backplane then SATA cables to SAS/SATA RAID card?

I just got a Supermicro chasis: http://www.newegg.com/Product/Product.aspx?Item=N82E16816101241 That has a backplane that supports SAS and SATA drives but the backplane has SATA ports to be ...
2
votes
1answer
2k views

Linux Multipath + SAS Array, “device errors” are logged to dmesg for passive paths? Possible to stop this?

I have two OpenSuSE 11.4 hosts connected to an LSI CTS2600 storage array via SAS. Every time I reboot the hosts, I see in dmesg output like [ 255.942890] end_request: I/O error, dev sdg, sector ...
1
vote
1answer
568 views

Replacing a PERC S300

The PERC S300 card that came with our Dell PowerEdge T110 servers is Windows only (see here). As a result, we're looking for an alternative that works under Linux. We had planned to use software RAID ...
1
vote
1answer
236 views

HP P410i as online spare

Is it possible to have dual P410i SAS controllers and use one for a online spare? I am fairly new to HP servers and I will be setting up a new G7 for production use. I have been reading about HP's ...
1
vote
1answer
2k views

Dell R910 with Integrated PERC H700 Adapter

I am in the process of designing an architecture based around a single Dell R910 server running Windows Server 2008 Enterprise. I would like the server to have 8 RAID1 pairs of spinning disks, so I ...
1
vote
2answers
655 views

Using an SAS Expander with a SAS Controller of a different brand

I'm planning on assembling a server, and I'm just wondering if a SAS expander by IBM (such as this one) would allow me to use the RAID and other features (Battery-backed write-back caching) of a SAS ...
1
vote
1answer
605 views

SAS controller on Dell power edge 2950 server

My knowledge on Dell server is growing daily, however there are many areas where I still require assistance. For example, Our institution recently purchased a LT2000 tape library system. This also ...
5
votes
6answers
6k views

Use of 2.5" Laptop Drives in a Server?

We're acquiring several 1U servers with (8) 2.5" drive slots. Although we can use either SATA or SAS, there is a large price variance as soon as you order 16 or 24 of these drives, so we are looking ...
7
votes
5answers
9k views

SAS or SATA for 3 TB drives?

We are looking to purchase new 3 TB enterprise-grade drives and can buy either SAS or SATA models. AFAIK, SAS generally gives better performance than SATA, but searching for benchmarks I found ...
5
votes
1answer
9k views

Are 6Gb/s SAS drives compatible with 3Gb/s SAS interfaces?

Are SAS 3Gb/s controllers (SAS1) forward compatible with newer SAS2 drives specified at 6Gb/s? The controller I have in mind is an LSI SAS1064. I know that SAS2 controllers are backwards compatible ...
2
votes
2answers
1k views

How can I enumerate SAS addresses/WWNs in Linux?

I have some SAS devices in a server, I would like to find out what their SAS addresses are. How can I do that in Linux? I'm using CentOS 6.
1
vote
2answers
264 views

When ordering SAS replacement drive, does the hot swappable enclosure matter?

I have a dell PowerEdge and need to replace one of the SAS drives in it. I noticed the supplier I order from does not sell a specific "DELL" SAS replacement drive, but they have what appear to be ...
2
votes
2answers
253 views

Why is my server's SAS drive 147 GB when most are 146 GB or does that matter?

I need to replace a failed drive in my Dell server's RAID 1 configuration. I pulled the drive and it's a Hitachi Ultrastar 15000rpm / SAS 147 GB. The supplier I usually order from only has SAS 15k ...
14
votes
4answers
14k views

Anyone seen a meaningful SAS vs SATA comparison/benchmark?

I hear lots about SATA being slower than SAS but I've only found 1 decent benchmark. http://blog.whitesites.com/SAS-RAID-0-VS-SCSI-RAID-0-VS-SATA-Benchmarks__633689244191943184_blog.htm In this, SAS ...
1
vote
1answer
220 views

PERC 6i With external Enclosure Raid Questions

Okay so I am buying some used hardware on ebay and found a few poweredge servers for a good price. These servers come with a PERC 6i card and 4x 146gb internal SAS drives. I want to purchase a 8 Bay ...
2
votes
2answers
5k views

How do I power SATA drives in my DELL poweredge 2850?

I have a Dell 2850 which I've been fairly happy with. It runs RAID 5 to 6 Hot-swap SCSI drives, but I'd like to add some cheap storage. So I bought an Intel PCI-X SATA raid card and tried to install ...
2
votes
3answers
3k views

SAS vs SAS2 interface

I´m pretty new to this server environment and I´m looking to expand the capacity of our HP Proliant DL385 G2 server. I want to replace the 146 GB disks with 300 GB disks. My question is: Can I use a ...
1
vote
0answers
614 views

LSI 9211-8i won't boot in KVM

I'm running ubuntu 11.04 with an LSI 9211-8i in IT mode with the latest firmware (10). I'm using KVM with VT-d enabled to pass the entire PCIe device through to the guest OS. I have the device ...
0
votes
3answers
981 views

SSD Performance for PHP?

My programmer just built an application with PHP using Doctrine ORM (will be a high traffic social networking website), and it's very heavy in PHP/Apache and CPU. The queries are wonderfully fast, and ...
1
vote
1answer
786 views

Connecting SAS tape unit to existing P410 controller in HP Proliant ML330-G6 under VMware ESXi 4.1

I have an HP ML330-G6 server with a single SAS/SATA drive bay unit containing a pair of mirrored 250GB SATA disks, running off a P410 SAS controller - all working fine. Now I have just fitted an ...
1
vote
2answers
733 views

Shrink an HP Smart Array on a P400

I just started consulting for a new client and one of 6 hard drives in their server's SAS array failed. Going over the options of replacing the drive, they didn't like the thought of spending about ...
2
votes
3answers
5k views

Linux / Multipath not using all paths, and won't use queue-length path_selector?

I have the following hardware: 2x SuperMicro servers (128GB RAM, 2x 8 core AMDs) 2x/server LSI SAS2008 PCIe MPT-Fusion2 HBAs (2 SAS ports per card) 1x LSI CTS2600 DAS with 24x W.D. 15.7k RPM 600GB ...
0
votes
1answer
1k views

Solaris 11 not seeing all SAS disks on HP P212 controller

I've got an HP X1600 with Solaris 11 installed on it. It's got a P212 SAS controller with a single external port. I've got 2x 10k 2.5" SAS drives installed and configured as RAID 1 on the controller ...
5
votes
4answers
3k views

Is it normal for a SAS drive to have a few bad blocks, or should I replace my drive ASAP?

I have a drive—part of a RAID 1 mirror—that has two bad blocks. Adaptec Storage Manger e-mailed me when it detected the blocks. It shows 4 medium errors for that drive, but state is still “optimal”. ...
2
votes
1answer
2k views

lsscsi finds sas device but none is listed in /dev

I have a server with 2 internal disks with Adaptec hardware RAID and an external disk box connected via SAS. lsscsi finds all the devices: # lsscsi [0:0:0:0] disk Adaptec System ...
1
vote
1answer
3k views

Can I connect a SATA III drive to a SAS controller and get the SATA III performance?

Can I connect a SATA III drive to a SAS controller and get the SATA III performance? Will I see slower performance from the SATA III drive by using a SAS controller than a SATA III controller?
1
vote
0answers
110 views

SUN x4600 SAS disk seems to be verry slow

I'm using SUN x4600 with 64GB ram and 2 SAS 146GB 10krpm with Solaris 10 One told me, that the system seems to be slow, so I did a iostat -xtc 5 2 which showed for a long period of time only 4-6000 ...
5
votes
2answers
870 views

Nearline SAS on SATA controllers

I know that SAS drives cannot operate on a SATA controller. I know that SATA drives can operate on a SAS controller. But can Near-Line SAS drives, being SATA drives with a SAS controller, be used on ...
0
votes
1answer
756 views

System can't see ServerRAID M1015 virtual drive?

We connected the card to our system and have created a new mirror RAID 1 virtual drive, Now we want to clone our existing single drive to this new virtual drive, but our cloning software Acronis True ...
1
vote
1answer
774 views

Adaptec 1405 or HP SmartArray P212 SAS controller supported in the stock RH 5.5 kernel?

I am ordering a custom server and looking at either an Adaptec 1405 SAS controller, or an HP SmartArray P212 to use for the internal SAS Ultrium drive (HP Ultrium LTO-4 1760). The server will be ...
1
vote
1answer
2k views

HP Autoloader mount, ESXi 4.1 through SAS - will it work?

I need to figure out if I can get this to work. I have a HP P2000 Storage system, connected to 2 x HP DL360 G7 through SAS. Then I got an HP Autoloader with connected through SAS too. Will I, in ...
0
votes
1answer
261 views

Read LUN from dell SAN with a PC on linux

We are currently using a md3000i DELL SAN server with a RAID1. I would like to access the information on one disk from a workstation. The hard disk contains 2 LUN but I can only access the first ...
1
vote
0answers
893 views

SAS vs SATA vs SSD: How to measure performance difference between SATA and SAS?

SAS drives can address multiple IO operations from a single platter revolution if the data happens to be where the head is already positioned. How can you measure whether this actually makes a ...
1
vote
2answers
123 views

LiveLinux PPC variant to boot and perform dd on SAS drive?

Ok here's the deal. In trying to install SLES 11, partd says it cannot read the partitioning on my SAS disk. Specifically I can reuse the existing AIX partition table but not edit it. The drive is SAS ...
4
votes
5answers
3k views

How should I sanitize a SAS drive that I removed from a RAID 5 Array?

I had a disk experience a predictive failure. As a result, I removed the drive and replaced it. Now that I have the drive removed, I would like to sanitize it. What is the easiest way to go about ...
2
votes
3answers
129 views

Plug in 6+ drives into a server (iSCSI/SAS expanders/SAN)

The company where I work has started to run out of disk space at 2.3TB. Originally it was a JBOD of a 1.5TB drive and a 1TB drive as a quick fix measure (yes I know this is bad, that's why I'm ...
0
votes
1answer
200 views

Scale a highly transactional SQL server

I’m looking to upgrade one of my site servers. The site currently executes around 20m sql queries a day and this is growing quite fast. Right now IO throughput is a real issue, so my idea is to move ...
1
vote
1answer
1k views

Does the PERC 5/i Integrated controller support SATA II/III?

I have a refurb 2950 with a PERC 5/i Integrated controller. Currently, there are 4x 3.5" SAS drives in use, with two slots available. I want to add two SSDs (using a 3.5" ICY dock) in RAID1 in the ...
0
votes
2answers
480 views

SAS HBA and P2000 SAS controllers speed

I have HP SC08Ge HBAs and P2000 G3 solution (RAID6, 8+2 spare disks) working on XenServer 5.6.0 . What seems to be strange, is the speed - 35MB/s maximum in one VM (Squeeze). Is it normal or I have to ...
0
votes
4answers
176 views

Best configuration for 6x SAS 10K RPM SAS discs as virtual host

I have an IBM xSeries with 6x SAS 74.8GB 10K discs which I will use as a virtual host (either VKM, Xen or Vmware). What is the suggested best setup of these discs? I have been using raid10, but ...