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 workstations, and it uses the standard SCSI command set.
Questions tagged [sas]
517 questions
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HP D2700 configuration
I have a HP D2700 connected to a dl360G7 with a p812 controller using one SAS cable.
The storage enclosure houses 23 SAS 450GB disks with one spare for a raid6 array.
It serves as an nfs datastore for 2 esxi servers.
In order to maximize prerfomance…
Nicholas Papadakos
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Mixing SAS 6Gbps and 12Gbps on same expander
We are building up some new servers and want to use 12Gbps SAS3 drives alongside some SATA 6Gbps Enterprise SSD's attached to a single Supermicro SAS3 backplane using an LSI SAS3 Expander and LSI / Broadcom 9361-8i RAID Controller with CacheCade Pro…
ausip
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Poor performance with Linux software raid-10
I have a machine with an 8 channel LSI SAS3008 controller chip, and individual drive testing shows I can write to any disk or all disks at between 174 MB/sec and 193 MB/sec with a sustained write speed:
This is the output from the command dd…
Michael Graff
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Expanding JBOD with SAS extenders
My project is expanding 24-HDD ZFS box by adding 45-drive box with option to add another 45-drive box later (all are JBODs).
Host box (24 HDDs) is Supermicro with single port expander backplane and LSI RAID card (I think, MegaRAID SAS 9240-8i).…
aaaaa says reinstate Monica
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What's the top normal S.M.A.R.T. temperature for HGST Helium Ultrastar 8TB 7200 RPM SAS 12Gb/s enterprise drives?
I've just received new Dell R730xd 2U server with faceplate 12 * 3.5" drive bays + 4 * 3.5" mid-body tray, located above RAM modules & CPUs. I've plugged 16 * HGST Helium 8Tb 7200 RPM SAS 12Gb/s drives and started 2 * 8 * 8Tb RAID6 volumes…
kuz8
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SAS balancing vs Network balancing
I want to configure file server in MS Windows Server 2012 R2 environment, which would load balance traffic.
I have got a SAS disk array with 2 SAS controllers which is connected to 2 Hyper-V cluster nodes by 4 redundant SAS multipaths:
controller1…
Ondra Hrubý
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Slow writes Dell Server R720
I have a Dell R720 Server with PERC H310 hardware raid 5 and 4 x Seagate Cheetah 15K.7 ST3300657SS 300GB hard drives. Windows Server 2008 R2. The reads look good, but the writes are painfully slow.
Running the Atto Disk Benchmark, I'm seeing read…
Jay Wen
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Hardware mods: kludging a conversion from U320 SCSI to SAS/SATA
I apologise if this isn't an appropriate question for this forum.
I've an elderly server that works well and that I'd therefore prefer not to scrap entirely. But I would like to replace the current U320 drives with SAS/SATA drives as the old ones…
MMacD
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How to upgrade the firmware of HP SAS expander card without Smart Array controller or Proliant Server?
How can I update/upgrade/flash the firmware of an HP SAS expander card [468406-B21 a.k.a. 487738-001]?
I used to do this using Windows and a HP P410 Smart Array controller, however that controller is no longer available.
The online ROM flash…
Pro Backup
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HP ProLiant ML350e Gen8 v2 Not Detecting Hard Drives
I have tested several solutions but non of them cant detect my 2 hard drives
(legacy mode , acpi and raid embended)
I have a 2 Dell-Seagate SAS Cheetah 15k,7 hard drives (ST3300657SS) (they are not brand new and was used on another server)
The hard…
warfish
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Steady red light on 2 HP SAS drives in RAID 1
I have a HP ProLiant web server with two HP 300GB SAS SFF 2.5 inch drives (Model: HP 507127-B21). Both drives have a solid red light, however there is no indication within the management software that either are in a pre-failure state. Also one of…
QFDev
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Third-party SSD in Proliant g8?
Anyone having success with third-party SATA or SAS drives with Proliant G8's? I know the G7's were flaky and had BIOS issues.
We're looking for real-world success stories with particular brands and models of enterprise-class SSDs.
(We'd hoped to…
AlexM
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Beginner SAS and server questions
I am a c++ programmer and database administrator looking to expand my knowledge of server administration and maintenance. I have read the Wikipedia pages and several other documents I found by googling, but there are still a few things I don't…
frnknstn
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What type of SAS/SATA cables do Dell SAS6/iR and SAS5/iR controller cards use?
I'm considering buying a bunch of these to upgrade our servers at work (with SATA drives, not true SAS). We are out of ports to plug disks into, and these cards are decently supported and cheap.
The one thing I can't seem to figure out is: what…
Zac B
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DAS vs SAN storage for serving 2 to 4 nodes
We currently have 4 Linux nodes with local storage, arranged in two active/passive pairs with storage mirrored using DRBD, running virtual machines (actually using Xen Hypervisor) for typical hosting workloads (mail, web, a couple VPS, etc.). We're…
Luke404
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